Loading...
17C-240 111 N Main Revised Drainage Analysis 3-16-17T REYNOLDS ENGINEERING | CIVIL ENGINEERS | PLANNING, DESIGN, AND PERMITTING SERVICES 152 Maplewood Terrace, Florence, MA 01062 | PHONE: 413-387-8078 | FAX: 413-727-3477 terry@treynoldsengineering.com | www.treynoldsengineering.com 1 of 2 3/17/2017 Stormwater Runoff Analysis Proposed Development 111 North Main Street, Florence, MA T Reynolds Engineering (TRE) has been retained by James Mailloux to design and perform stormwater flow calculations for the existing and proposed conditions at 111 North Main Street in Florence, MA. The purpose of this analysis is to evaluate the proposed stormwater design with regard to potential increases in stormwater flows associated with the development of the property. Project Summary James Mailloux are proposing to build a new 2 unit residential building on what was the previous site of an 1 unit residential building. In addition, an associated paved driveway and associated utilities are proposed. The intent of this report is to show that the project will meet the general performance standards for City approval. The project has been designed so that existing stormwater drainage patterns and volumes will generally not be changed. Some stormwater runoff from the proposed building and parking area will continue to flow to the roadway with no significant increase in quantity. Runoff from the majority of the roofs will be collected, routed to a infiltration galley in the northwest corner of the site. Peak discharges for the storm events do show a slight increase, but are considered within the tolerance of the computer model and should be considered insignificant and not interpreted to be an actual increase in flow. Soil Conditions Review of the Soil Conservation Service (SCS), now Natural Resource Conservation Service (NRCS), Soil Survey Manual of Hampshire County, Panel 13, indicates soils located within the area of concern are considered to be 253A—Hinckley loamy sand, and are classified as hydrologic group A. See the attached soils report for additional soils information Method of Drainage Analysis The program HydroCAD was utilized to perform stormwater modeling for this project. HydroCAD uses the NRCS method of analysis TR-20. The TR-20 method is a widely accepted, standard engineering practice within the civil engineering profession. The NRCS method of hydrology analysis utilizes the drainage area, hydraulic length, terrain slope, and soil conditions of a watershed or catchment as input to calculate peak flows and total volume of runoff for specific synthetic rain events. The model analyzes approximately 0.205 acres of the site area contributing stormwater runoff flows to two design points. TRE modeled the 2-year, 10-year and 100-year statistical rain events for the existing and proposed condition. The total rainfall per a 24-hour period for the 2, 10 and 100-year statistical rain events are 3.0-inches, 4.5-inches and 6.5-inches respectively. 111 N Main St Florence 3/17/2017 T REYNOLDS ENGINEERING | CIVIL ENGINEERS | PLANNING, DESIGN AND PERMITTING SERVICES 152 Maplewood Terrace, Florence, MA 01062 |PHONE:413-387-8078,FAX:413-727-3477 terry@treynoldsengineering.com |www.treynoldsengineering.com 2 of 2 Limitations The stormwater analysis was performed in accordance with standard civil engineering practice and relies on information provided by other parties as well as published information. Potential runoff analysis was limited to areas within the bounds of property owned and areas immediately adjacent and interpreted to drain toward the areas of concern. It shall also be understood that the NRCS Method of drainage analyses was originally formulated to assist with the development of farmland and crop production. Although the NRCS method has become one of the standard methods of hydrologic analysis within civil engineering community, it may be conservative for use on very small areas of modern development and provide runoff results that are greater than actual conditions. Model Results The following tables summarize the results of the drainage analysis using HydroCad. Two design points were used to evaluate runoff going to North Main Street and the back yard. North Main Street 2-Year (cfs) 10-Year (cfs) 100-Year (cfs) Existing Conditions 0.08 0.17 0.31 Proposed Condition 0.08 0.17 0.29 Back Yard Infiltration 2-Year (cfs) 10-Year (cfs) 100-Year (cfs) Existing Conditions 0.00 0.01 0.11 Proposed Condition 0.00 0.03 0.12 Conclusions As can be seen from the above results, flows to North Main Street show a no increase. Flows to the back yard show a slight increase, but are generally considered within the tolerance of the computer model and should be considered insignificant and not increasing. Ponding in the back yard is expected to be minimal to none for all events and infiltrate within 24 hours for all events. The leaching galley is expected to handle up to and including a 100-year storm event without overtopping and infiltrate completely within 24 hours. United States Department of Agriculture A product of the National Cooperative Soil Survey, a joint effort of the United States Department of Agriculture and other Federal agencies, State agencies including the Agricultural Experiment Stations, and local participants Custom Soil Resource Report for Hampshire County, Massachusetts, Central Part Natural Resources Conservation Service September 17, 2016 Preface Soil surveys contain information that affects land use planning in survey areas. They highlight soil limitations that affect various land uses and provide information about the properties of the soils in the survey areas. Soil surveys are designed for many different users, including farmers, ranchers, foresters, agronomists, urban planners, community officials, engineers, developers, builders, and home buyers. Also, conservationists, teachers, students, and specialists in recreation, waste disposal, and pollution control can use the surveys to help them understand, protect, or enhance the environment. Various land use regulations of Federal, State, and local governments may impose special restrictions on land use or land treatment. Soil surveys identify soil properties that are used in making various land use or land treatment decisions. The information is intended to help the land users identify and reduce the effects of soil limitations on various land uses. The landowner or user is responsible for identifying and complying with existing laws and regulations. Although soil survey information can be used for general farm, local, and wider area planning, onsite investigation is needed to supplement this information in some cases. Examples include soil quality assessments (http://www.nrcs.usda.gov/wps/portal/ nrcs/main/soils/health/) and certain conservation and engineering applications. For more detailed information, contact your local USDA Service Center (http:// offices.sc.egov.usda.gov/locator/app?agency=nrcs) or your NRCS State Soil Scientist (http://www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/contactus/? cid=nrcs142p2_053951). Great differences in soil properties can occur within short distances. Some soils are seasonally wet or subject to flooding. Some are too unstable to be used as a foundation for buildings or roads. Clayey or wet soils are poorly suited to use as septic tank absorption fields. A high water table makes a soil poorly suited to basements or underground installations. The National Cooperative Soil Survey is a joint effort of the United States Department of Agriculture and other Federal agencies, State agencies including the Agricultural Experiment Stations, and local agencies. The Natural Resources Conservation Service (NRCS) has leadership for the Federal part of the National Cooperative Soil Survey. Information about soils is updated periodically. Updated information is available through the NRCS Web Soil Survey, the site for official soil survey information. The U.S. Department of Agriculture (USDA) prohibits discrimination in all its programs and activities on the basis of race, color, national origin, age, disability, and where applicable, sex, marital status, familial status, parental status, religion, sexual orientation, genetic information, political beliefs, reprisal, or because all or a part of an individual's income is derived from any public assistance program. (Not all prohibited bases apply to all programs.) Persons with disabilities who require alternative means 2 for communication of program information (Braille, large print, audiotape, etc.) should contact USDA's TARGET Center at (202) 720-2600 (voice and TDD). To file a complaint of discrimination, write to USDA, Director, Office of Civil Rights, 1400 Independence Avenue, S.W., Washington, D.C. 20250-9410 or call (800) 795-3272 (voice) or (202) 720-6382 (TDD). USDA is an equal opportunity provider and employer. 3 Contents Preface....................................................................................................................2 How Soil Surveys Are Made..................................................................................5 Soil Map..................................................................................................................7 Soil Map................................................................................................................8 Legend..................................................................................................................9 Map Unit Legend................................................................................................10 Map Unit Descriptions........................................................................................10 Hampshire County, Massachusetts, Central Part...........................................12 253A—Hinckley loamy sand, 0 to 3 percent slopes....................................12 References............................................................................................................14 4 How Soil Surveys Are Made Soil surveys are made to provide information about the soils and miscellaneous areas in a specific area. They include a description of the soils and miscellaneous areas and their location on the landscape and tables that show soil properties and limitations affecting various uses. Soil scientists observed the steepness, length, and shape of the slopes; the general pattern of drainage; the kinds of crops and native plants; and the kinds of bedrock. They observed and described many soil profiles. A soil profile is the sequence of natural layers, or horizons, in a soil. The profile extends from the surface down into the unconsolidated material in which the soil formed or from the surface down to bedrock. The unconsolidated material is devoid of roots and other living organisms and has not been changed by other biological activity. Currently, soils are mapped according to the boundaries of major land resource areas (MLRAs). MLRAs are geographically associated land resource units that share common characteristics related to physiography, geology, climate, water resources, soils, biological resources, and land uses (USDA, 2006). Soil survey areas typically consist of parts of one or more MLRA. The soils and miscellaneous areas in a survey area occur in an orderly pattern that is related to the geology, landforms, relief, climate, and natural vegetation of the area. Each kind of soil and miscellaneous area is associated with a particular kind of landform or with a segment of the landform. By observing the soils and miscellaneous areas in the survey area and relating their position to specific segments of the landform, a soil scientist develops a concept, or model, of how they were formed. Thus, during mapping, this model enables the soil scientist to predict with a considerable degree of accuracy the kind of soil or miscellaneous area at a specific location on the landscape. Commonly, individual soils on the landscape merge into one another as their characteristics gradually change. To construct an accurate soil map, however, soil scientists must determine the boundaries between the soils. They can observe only a limited number of soil profiles. Nevertheless, these observations, supplemented by an understanding of the soil-vegetation-landscape relationship, are sufficient to verify predictions of the kinds of soil in an area and to determine the boundaries. Soil scientists recorded the characteristics of the soil profiles that they studied. They noted soil color, texture, size and shape of soil aggregates, kind and amount of rock fragments, distribution of plant roots, reaction, and other features that enable them to identify soils. After describing the soils in the survey area and determining their properties, the soil scientists assigned the soils to taxonomic classes (units). Taxonomic classes are concepts. Each taxonomic class has a set of soil characteristics with precisely defined limits. The classes are used as a basis for comparison to classify soils systematically. Soil taxonomy, the system of taxonomic classification used in the United States, is based mainly on the kind and character of soil properties and the arrangement of horizons within the profile. After the soil scientists classified and named the soils in the survey area, they compared the 5 individual soils with similar soils in the same taxonomic class in other areas so that they could confirm data and assemble additional data based on experience and research. The objective of soil mapping is not to delineate pure map unit components; the objective is to separate the landscape into landforms or landform segments that have similar use and management requirements. Each map unit is defined by a unique combination of soil components and/or miscellaneous areas in predictable proportions. Some components may be highly contrasting to the other components of the map unit. The presence of minor components in a map unit in no way diminishes the usefulness or accuracy of the data. The delineation of such landforms and landform segments on the map provides sufficient information for the development of resource plans. If intensive use of small areas is planned, onsite investigation is needed to define and locate the soils and miscellaneous areas. Soil scientists make many field observations in the process of producing a soil map. The frequency of observation is dependent upon several factors, including scale of mapping, intensity of mapping, design of map units, complexity of the landscape, and experience of the soil scientist. Observations are made to test and refine the soil- landscape model and predictions and to verify the classification of the soils at specific locations. Once the soil-landscape model is refined, a significantly smaller number of measurements of individual soil properties are made and recorded. These measurements may include field measurements, such as those for color, depth to bedrock, and texture, and laboratory measurements, such as those for content of sand, silt, clay, salt, and other components. Properties of each soil typically vary from one point to another across the landscape. Observations for map unit components are aggregated to develop ranges of characteristics for the components. The aggregated values are presented. Direct measurements do not exist for every property presented for every map unit component. Values for some properties are estimated from combinations of other properties. While a soil survey is in progress, samples of some of the soils in the area generally are collected for laboratory analyses and for engineering tests. Soil scientists interpret the data from these analyses and tests as well as the field-observed characteristics and the soil properties to determine the expected behavior of the soils under different uses. Interpretations for all of the soils are field tested through observation of the soils in different uses and under different levels of management. Some interpretations are modified to fit local conditions, and some new interpretations are developed to meet local needs. Data are assembled from other sources, such as research information, production records, and field experience of specialists. For example, data on crop yields under defined levels of management are assembled from farm records and from field or plot experiments on the same kinds of soil. Predictions about soil behavior are based not only on soil properties but also on such variables as climate and biological activity. Soil conditions are predictable over long periods of time, but they are not predictable from year to year. For example, soil scientists can predict with a fairly high degree of accuracy that a given soil will have a high water table within certain depths in most years, but they cannot predict that a high water table will always be at a specific level in the soil on a specific date. After soil scientists located and identified the significant natural bodies of soil in the survey area, they drew the boundaries of these bodies on aerial photographs and identified each as a specific map unit. Aerial photographs show trees, buildings, fields, roads, and rivers, all of which help in locating boundaries accurately. Custom Soil Resource Report 6 Soil Map The soil map section includes the soil map for the defined area of interest, a list of soil map units on the map and extent of each map unit, and cartographic symbols displayed on the map. Also presented are various metadata about data used to produce the map, and a description of each soil map unit. 7 8 Custom Soil Resource Report Soil Map 4689910468992046899304689940468995046899604689970468998046899904690000469001046899204689930468994046899504689960468997046899804689990469000046900104690020691430 691440 691450 691460 691470 691480 691490 691500 691510 691520 691530 691540 691550 691560 691570 691580 691590 691430 691440 691450 691460 691470 691480 691490 691500 691510 691520 691530 691540 691550 691560 691570 691580 691590 42° 20' 19'' N 72° 40' 34'' W42° 20' 19'' N72° 40' 27'' W42° 20' 16'' N 72° 40' 34'' W42° 20' 16'' N 72° 40' 27'' WN Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 18N WGS84 0 35 70 140 210Feet 0 10 20 40 60Meters Map Scale: 1:784 if printed on A landscape (11" x 8.5") sheet. MAP LEGEND MAP INFORMATION Area of Interest (AOI) Area of Interest (AOI) Soils Soil Map Unit Polygons Soil Map Unit Lines Soil Map Unit Points Special Point Features Blowout Borrow Pit Clay Spot Closed Depression Gravel Pit Gravelly Spot Landfill Lava Flow Marsh or swamp Mine or Quarry Miscellaneous Water Perennial Water Rock Outcrop Saline Spot Sandy Spot Severely Eroded Spot Sinkhole Slide or Slip Sodic Spot Spoil Area Stony Spot Very Stony Spot Wet Spot Other Special Line Features Water Features Streams and Canals Transportation Rails Interstate Highways US Routes Major Roads Local Roads Background Aerial Photography The soil surveys that comprise your AOI were mapped at 1:15,800. Warning: Soil Map may not be valid at this scale. Enlargement of maps beyond the scale of mapping can cause misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed scale. Please rely on the bar scale on each map sheet for map measurements. Source of Map: Natural Resources Conservation Service Web Soil Survey URL: http://websoilsurvey.nrcs.usda.gov Coordinate System: Web Mercator (EPSG:3857) Maps from the Web Soil Survey are based on the Web Mercator projection, which preserves direction and shape but distorts distance and area. A projection that preserves area, such as the Albers equal-area conic projection, should be used if more accurate calculations of distance or area are required. This product is generated from the USDA-NRCS certified data as of the version date(s) listed below. Soil Survey Area: Hampshire County, Massachusetts, Central Part Survey Area Data: Version 10, Sep 28, 2015 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Mar 28, 2011—Apr 18, 2011 The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident. Custom Soil Resource Report 9 Map Unit Legend Hampshire County, Massachusetts, Central Part (MA609) Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI 253A Hinckley loamy sand, 0 to 3 percent slopes 2.8 100.0% Totals for Area of Interest 2.8 100.0% Map Unit Descriptions The map units delineated on the detailed soil maps in a soil survey represent the soils or miscellaneous areas in the survey area. The map unit descriptions, along with the maps, can be used to determine the composition and properties of a unit. A map unit delineation on a soil map represents an area dominated by one or more major kinds of soil or miscellaneous areas. A map unit is identified and named according to the taxonomic classification of the dominant soils. Within a taxonomic class there are precisely defined limits for the properties of the soils. On the landscape, however, the soils are natural phenomena, and they have the characteristic variability of all natural phenomena. Thus, the range of some observed properties may extend beyond the limits defined for a taxonomic class. Areas of soils of a single taxonomic class rarely, if ever, can be mapped without including areas of other taxonomic classes. Consequently, every map unit is made up of the soils or miscellaneous areas for which it is named and some minor components that belong to taxonomic classes other than those of the major soils. Most minor soils have properties similar to those of the dominant soil or soils in the map unit, and thus they do not affect use and management. These are called noncontrasting, or similar, components. They may or may not be mentioned in a particular map unit description. Other minor components, however, have properties and behavioral characteristics divergent enough to affect use or to require different management. These are called contrasting, or dissimilar, components. They generally are in small areas and could not be mapped separately because of the scale used. Some small areas of strongly contrasting soils or miscellaneous areas are identified by a special symbol on the maps. If included in the database for a given area, the contrasting minor components are identified in the map unit descriptions along with some characteristics of each. A few areas of minor components may not have been observed, and consequently they are not mentioned in the descriptions, especially where the pattern was so complex that it was impractical to make enough observations to identify all the soils and miscellaneous areas on the landscape. The presence of minor components in a map unit in no way diminishes the usefulness or accuracy of the data. The objective of mapping is not to delineate pure taxonomic classes but rather to separate the landscape into landforms or landform segments that have similar use and management requirements. The delineation of such segments on the map provides sufficient information for the development of resource plans. If intensive use of small areas is planned, however, onsite investigation is needed to define and locate the soils and miscellaneous areas. Custom Soil Resource Report 10 An identifying symbol precedes the map unit name in the map unit descriptions. Each description includes general facts about the unit and gives important soil properties and qualities. Soils that have profiles that are almost alike make up a soil series. Except for differences in texture of the surface layer, all the soils of a series have major horizons that are similar in composition, thickness, and arrangement. Soils of one series can differ in texture of the surface layer, slope, stoniness, salinity, degree of erosion, and other characteristics that affect their use. On the basis of such differences, a soil series is divided into soil phases. Most of the areas shown on the detailed soil maps are phases of soil series. The name of a soil phase commonly indicates a feature that affects use or management. For example, Alpha silt loam, 0 to 2 percent slopes, is a phase of the Alpha series. Some map units are made up of two or more major soils or miscellaneous areas. These map units are complexes, associations, or undifferentiated groups. A complex consists of two or more soils or miscellaneous areas in such an intricate pattern or in such small areas that they cannot be shown separately on the maps. The pattern and proportion of the soils or miscellaneous areas are somewhat similar in all areas. Alpha-Beta complex, 0 to 6 percent slopes, is an example. An association is made up of two or more geographically associated soils or miscellaneous areas that are shown as one unit on the maps. Because of present or anticipated uses of the map units in the survey area, it was not considered practical or necessary to map the soils or miscellaneous areas separately. The pattern and relative proportion of the soils or miscellaneous areas are somewhat similar. Alpha- Beta association, 0 to 2 percent slopes, is an example. An undifferentiated group is made up of two or more soils or miscellaneous areas that could be mapped individually but are mapped as one unit because similar interpretations can be made for use and management. The pattern and proportion of the soils or miscellaneous areas in a mapped area are not uniform. An area can be made up of only one of the major soils or miscellaneous areas, or it can be made up of all of them. Alpha and Beta soils, 0 to 2 percent slopes, is an example. Some surveys include miscellaneous areas. Such areas have little or no soil material and support little or no vegetation. Rock outcrop is an example. Custom Soil Resource Report 11 Hampshire County, Massachusetts, Central Part 253A—Hinckley loamy sand, 0 to 3 percent slopes Map Unit Setting National map unit symbol: 2svm7 Elevation: 0 to 1,420 feet Mean annual precipitation: 36 to 71 inches Mean annual air temperature: 39 to 55 degrees F Frost-free period: 140 to 240 days Farmland classification: Farmland of statewide importance Map Unit Composition Hinckley and similar soils: 85 percent Minor components: 15 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Hinckley Setting Landform: Outwash plains, outwash terraces, outwash deltas, kame terraces Landform position (three-dimensional): Tread Down-slope shape: Linear, concave, convex Across-slope shape: Linear, convex, concave Parent material: Sandy and gravelly glaciofluvial deposits derived from gneiss and/ or granite and/or schist Typical profile Oe - 0 to 1 inches: moderately decomposed plant material A - 1 to 8 inches: loamy sand Bw1 - 8 to 11 inches: gravelly loamy sand Bw2 - 11 to 16 inches: gravelly loamy sand BC - 16 to 19 inches: very gravelly loamy sand C - 19 to 65 inches: very gravelly sand Properties and qualities Slope: 0 to 3 percent Depth to restrictive feature: More than 80 inches Natural drainage class: Excessively drained Runoff class: Negligible Capacity of the most limiting layer to transmit water (Ksat): Moderately high to very high (1.42 to 99.90 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Salinity, maximum in profile: Nonsaline to very slightly saline (0.0 to 2.0 mmhos/cm) Available water storage in profile: Low (about 3.1 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 3s Hydrologic Soil Group: A Hydric soil rating: No Custom Soil Resource Report 12 Minor Components Windsor Percent of map unit: 5 percent Landform: Outwash terraces, kame terraces, outwash deltas Landform position (three-dimensional): Tread Down-slope shape: Concave, linear, convex Across-slope shape: Linear, convex, concave Hydric soil rating: No Merrimac Percent of map unit: 5 percent Landform: Outwash deltas, kame terraces, outwash terraces Landform position (three-dimensional): Tread Down-slope shape: Convex, linear, concave Across-slope shape: Convex, linear, concave Hydric soil rating: No Sudbury Percent of map unit: 5 percent Landform: Kame terraces, outwash terraces, outwash deltas Landform position (three-dimensional): Tread Down-slope shape: Convex, concave, linear Across-slope shape: Linear, convex, concave Hydric soil rating: No Custom Soil Resource Report 13 References American Association of State Highway and Transportation Officials (AASHTO). 2004. Standard specifications for transportation materials and methods of sampling and testing. 24th edition. American Society for Testing and Materials (ASTM). 2005. Standard classification of soils for engineering purposes. ASTM Standard D2487-00. Cowardin, L.M., V. Carter, F.C. Golet, and E.T. LaRoe. 1979. Classification of wetlands and deep-water habitats of the United States. U.S. Fish and Wildlife Service FWS/OBS-79/31. Federal Register. July 13, 1994. Changes in hydric soils of the United States. Federal Register. September 18, 2002. Hydric soils of the United States. Hurt, G.W., and L.M. Vasilas, editors. Version 6.0, 2006. Field indicators of hydric soils in the United States. National Research Council. 1995. Wetlands: Characteristics and boundaries. Soil Survey Division Staff. 1993. Soil survey manual. Soil Conservation Service. U.S. Department of Agriculture Handbook 18. http://www.nrcs.usda.gov/wps/portal/nrcs/ detail/national/soils/?cid=nrcs142p2_054262 Soil Survey Staff. 1999. Soil taxonomy: A basic system of soil classification for making and interpreting soil surveys. 2nd edition. Natural Resources Conservation Service, U.S. Department of Agriculture Handbook 436. http://www.nrcs.usda.gov/wps/portal/ nrcs/detail/national/soils/?cid=nrcs142p2_053577 Soil Survey Staff. 2010. Keys to soil taxonomy. 11th edition. U.S. Department of Agriculture, Natural Resources Conservation Service. http://www.nrcs.usda.gov/wps/ portal/nrcs/detail/national/soils/?cid=nrcs142p2_053580 Tiner, R.W., Jr. 1985. Wetlands of Delaware. U.S. Fish and Wildlife Service and Delaware Department of Natural Resources and Environmental Control, Wetlands Section. United States Army Corps of Engineers, Environmental Laboratory. 1987. Corps of Engineers wetlands delineation manual. Waterways Experiment Station Technical Report Y-87-1. United States Department of Agriculture, Natural Resources Conservation Service. National forestry manual. http://www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/ home/?cid=nrcs142p2_053374 United States Department of Agriculture, Natural Resources Conservation Service. National range and pasture handbook. http://www.nrcs.usda.gov/wps/portal/nrcs/ detail/national/landuse/rangepasture/?cid=stelprdb1043084 14 United States Department of Agriculture, Natural Resources Conservation Service. National soil survey handbook, title 430-VI. http://www.nrcs.usda.gov/wps/portal/ nrcs/detail/soils/scientists/?cid=nrcs142p2_054242 United States Department of Agriculture, Natural Resources Conservation Service. 2006. Land resource regions and major land resource areas of the United States, the Caribbean, and the Pacific Basin. U.S. Department of Agriculture Handbook 296. http://www.nrcs.usda.gov/wps/portal/nrcs/detail/national/soils/? cid=nrcs142p2_053624 United States Department of Agriculture, Soil Conservation Service. 1961. Land capability classification. U.S. Department of Agriculture Handbook 210. http:// www.nrcs.usda.gov/Internet/FSE_DOCUMENTS/nrcs142p2_052290.pdf Custom Soil Resource Report 15 1S 2S5R North Main 4P Back Yard Routing Diagram for Pre-DevPrepared by Microsoft, Printed 2/27/2017 HydroCAD® 10.00 s/n 02175 © 2013 HydroCAD Software Solutions LLC Subcat Reach Pond Link Pre-Dev Printed 2/27/2017Prepared by Microsoft Page 2HydroCAD® 10.00 s/n 02175 © 2013 HydroCAD Software Solutions LLC Area Listing (all nodes) Area (acres) CN Description (subcatchment-numbers) 0.145 39 >75% Grass cover, Good, HSG A (1S, 2S) 0.014 98 Roofs, HSG A (2S) 0.045 98 Roofs, HSG B (1S) 0.205 56 TOTAL AREA Type III 24-hr 2-Year Event Rainfall=3.00"Pre-Dev Printed 2/27/2017Prepared by Microsoft Page 3HydroCAD® 10.00 s/n 02175 © 2013 HydroCAD Software Solutions LLC Time span=5.00-72.00 hrs, dt=0.05 hrs, 1341 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Runoff Area=3,185 sf 61.60% Impervious Runoff Depth=0.96"Subcatchment 1S: Tc=6.0 min CN=75 Runoff=0.08 cfs 0.006 af Runoff Area=5,738 sf 10.96% Impervious Runoff Depth=0.02"Subcatchment 2S: Tc=6.0 min CN=45 Runoff=0.00 cfs 0.000 af Inflow=0.08 cfs 0.006 afReach 5R: North Main Outflow=0.08 cfs 0.006 af Peak Elev=96.00' Storage=0 cf Inflow=0.00 cfs 0.000 afPond 4P: Back Yard Outflow=0.00 cfs 0.000 af Total Runoff Area = 0.205 ac Runoff Volume = 0.006 af Average Runoff Depth = 0.36" 70.96% Pervious = 0.145 ac 29.04% Impervious = 0.059 ac Type III 24-hr 2-Year Event Rainfall=3.00"Pre-Dev Printed 2/27/2017Prepared by Microsoft Page 4HydroCAD® 10.00 s/n 02175 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Runoff = 0.08 cfs @ 12.10 hrs, Volume= 0.006 af, Depth= 0.96" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-72.00 hrs, dt= 0.05 hrs Type III 24-hr 2-Year Event Rainfall=3.00" Area (sf) CN Description 1,962 98 Roofs, HSG B 1,223 39 >75% Grass cover, Good, HSG A 3,185 75 Weighted Average 1,223 38.40% Pervious Area 1,962 61.60% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Summary for Subcatchment 2S: Runoff = 0.00 cfs @ 16.95 hrs, Volume= 0.000 af, Depth= 0.02" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-72.00 hrs, dt= 0.05 hrs Type III 24-hr 2-Year Event Rainfall=3.00" Area (sf) CN Description 629 98 Roofs, HSG A 5,109 39 >75% Grass cover, Good, HSG A 5,738 45 Weighted Average 5,109 89.04% Pervious Area 629 10.96% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Summary for Reach 5R: North Main Inflow Area = 0.073 ac, 61.60% Impervious, Inflow Depth = 0.96" for 2-Year Event event Inflow = 0.08 cfs @ 12.10 hrs, Volume= 0.006 af Outflow = 0.08 cfs @ 12.10 hrs, Volume= 0.006 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-72.00 hrs, dt= 0.05 hrs Summary for Pond 4P: Back Yard Inflow Area = 0.132 ac, 10.96% Impervious, Inflow Depth = 0.02" for 2-Year Event event Inflow = 0.00 cfs @ 16.95 hrs, Volume= 0.000 af Outflow = 0.00 cfs @ 16.95 hrs, Volume= 0.000 af, Atten= 0%, Lag= 0.0 min Discarded = 0.00 cfs @ 16.95 hrs, Volume= 0.000 af Type III 24-hr 2-Year Event Rainfall=3.00"Pre-Dev Printed 2/27/2017Prepared by Microsoft Page 5HydroCAD® 10.00 s/n 02175 © 2013 HydroCAD Software Solutions LLC Routing by Dyn-Stor-Ind method, Time Span= 5.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 96.00' @ 5.00 hrs Surf.Area= 89 sf Storage= 0 cf Plug-Flow detention time= (not calculated: outflow precedes inflow) Center-of-Mass det. time= 0.0 min ( 1,155.4 - 1,155.4 ) Volume Invert Avail.Storage Storage Description #1 96.00' 1,650 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 96.00 89 0 0 97.00 3,210 1,650 1,650 Device Routing Invert Outlet Devices #1 Discarded 96.00'2.410 in/hr Exfiltration over Surface area Conductivity to Groundwater Elevation = 95.00' Discarded OutFlow Max=0.00 cfs @ 16.95 hrs HW=96.00' (Free Discharge) 1=Exfiltration (Passes 0.00 cfs of 0.00 cfs potential flow) Type III 24-hr 10-Year Event Rainfall=4.50"Pre-Dev Printed 2/27/2017Prepared by Microsoft Page 6HydroCAD® 10.00 s/n 02175 © 2013 HydroCAD Software Solutions LLC Time span=5.00-72.00 hrs, dt=0.05 hrs, 1341 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Runoff Area=3,185 sf 61.60% Impervious Runoff Depth=2.05"Subcatchment 1S: Tc=6.0 min CN=75 Runoff=0.17 cfs 0.012 af Runoff Area=5,738 sf 10.96% Impervious Runoff Depth=0.30"Subcatchment 2S: Tc=6.0 min CN=45 Runoff=0.01 cfs 0.003 af Inflow=0.17 cfs 0.012 afReach 5R: North Main Outflow=0.17 cfs 0.012 af Peak Elev=96.03' Storage=5 cf Inflow=0.01 cfs 0.003 afPond 4P: Back Yard Outflow=0.01 cfs 0.003 af Total Runoff Area = 0.205 ac Runoff Volume = 0.016 af Average Runoff Depth = 0.92" 70.96% Pervious = 0.145 ac 29.04% Impervious = 0.059 ac Type III 24-hr 10-Year Event Rainfall=4.50"Pre-Dev Printed 2/27/2017Prepared by Microsoft Page 7HydroCAD® 10.00 s/n 02175 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Runoff = 0.17 cfs @ 12.10 hrs, Volume= 0.012 af, Depth= 2.05" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-72.00 hrs, dt= 0.05 hrs Type III 24-hr 10-Year Event Rainfall=4.50" Area (sf) CN Description 1,962 98 Roofs, HSG B 1,223 39 >75% Grass cover, Good, HSG A 3,185 75 Weighted Average 1,223 38.40% Pervious Area 1,962 61.60% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Summary for Subcatchment 2S: Runoff = 0.01 cfs @ 12.37 hrs, Volume= 0.003 af, Depth= 0.30" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-72.00 hrs, dt= 0.05 hrs Type III 24-hr 10-Year Event Rainfall=4.50" Area (sf) CN Description 629 98 Roofs, HSG A 5,109 39 >75% Grass cover, Good, HSG A 5,738 45 Weighted Average 5,109 89.04% Pervious Area 629 10.96% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Summary for Reach 5R: North Main Inflow Area = 0.073 ac, 61.60% Impervious, Inflow Depth = 2.05" for 10-Year Event event Inflow = 0.17 cfs @ 12.10 hrs, Volume= 0.012 af Outflow = 0.17 cfs @ 12.10 hrs, Volume= 0.012 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-72.00 hrs, dt= 0.05 hrs Summary for Pond 4P: Back Yard Inflow Area = 0.132 ac, 10.96% Impervious, Inflow Depth = 0.30" for 10-Year Event event Inflow = 0.01 cfs @ 12.37 hrs, Volume= 0.003 af Outflow = 0.01 cfs @ 12.52 hrs, Volume= 0.003 af, Atten= 23%, Lag= 9.0 min Discarded = 0.01 cfs @ 12.52 hrs, Volume= 0.003 af Type III 24-hr 10-Year Event Rainfall=4.50"Pre-Dev Printed 2/27/2017Prepared by Microsoft Page 8HydroCAD® 10.00 s/n 02175 © 2013 HydroCAD Software Solutions LLC Routing by Dyn-Stor-Ind method, Time Span= 5.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 96.03' @ 12.52 hrs Surf.Area= 190 sf Storage= 5 cf Plug-Flow detention time= 1.3 min calculated for 0.003 af (100% of inflow) Center-of-Mass det. time= 1.3 min ( 970.3 - 969.0 ) Volume Invert Avail.Storage Storage Description #1 96.00' 1,650 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 96.00 89 0 0 97.00 3,210 1,650 1,650 Device Routing Invert Outlet Devices #1 Discarded 96.00'2.410 in/hr Exfiltration over Surface area Conductivity to Groundwater Elevation = 95.00' Discarded OutFlow Max=0.01 cfs @ 12.52 hrs HW=96.03' (Free Discharge) 1=Exfiltration ( Controls 0.01 cfs) Type III 24-hr 100-Year Event Rainfall=6.50"Pre-Dev Printed 2/27/2017Prepared by Microsoft Page 9HydroCAD® 10.00 s/n 02175 © 2013 HydroCAD Software Solutions LLC Time span=5.00-72.00 hrs, dt=0.05 hrs, 1341 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Runoff Area=3,185 sf 61.60% Impervious Runoff Depth=3.71"Subcatchment 1S: Tc=6.0 min CN=75 Runoff=0.31 cfs 0.023 af Runoff Area=5,738 sf 10.96% Impervious Runoff Depth=1.01"Subcatchment 2S: Tc=6.0 min CN=45 Runoff=0.11 cfs 0.011 af Inflow=0.31 cfs 0.023 afReach 5R: North Main Outflow=0.31 cfs 0.023 af Peak Elev=96.19' Storage=76 cf Inflow=0.11 cfs 0.011 afPond 4P: Back Yard Outflow=0.04 cfs 0.011 af Total Runoff Area = 0.205 ac Runoff Volume = 0.034 af Average Runoff Depth = 1.97" 70.96% Pervious = 0.145 ac 29.04% Impervious = 0.059 ac Type III 24-hr 100-Year Event Rainfall=6.50"Pre-Dev Printed 2/27/2017Prepared by Microsoft Page 10HydroCAD® 10.00 s/n 02175 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Runoff = 0.31 cfs @ 12.09 hrs, Volume= 0.023 af, Depth= 3.71" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-72.00 hrs, dt= 0.05 hrs Type III 24-hr 100-Year Event Rainfall=6.50" Area (sf) CN Description 1,962 98 Roofs, HSG B 1,223 39 >75% Grass cover, Good, HSG A 3,185 75 Weighted Average 1,223 38.40% Pervious Area 1,962 61.60% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Summary for Subcatchment 2S: Runoff = 0.11 cfs @ 12.12 hrs, Volume= 0.011 af, Depth= 1.01" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-72.00 hrs, dt= 0.05 hrs Type III 24-hr 100-Year Event Rainfall=6.50" Area (sf) CN Description 629 98 Roofs, HSG A 5,109 39 >75% Grass cover, Good, HSG A 5,738 45 Weighted Average 5,109 89.04% Pervious Area 629 10.96% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Summary for Reach 5R: North Main Inflow Area = 0.073 ac, 61.60% Impervious, Inflow Depth = 3.71" for 100-Year Event event Inflow = 0.31 cfs @ 12.09 hrs, Volume= 0.023 af Outflow = 0.31 cfs @ 12.09 hrs, Volume= 0.023 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-72.00 hrs, dt= 0.05 hrs Summary for Pond 4P: Back Yard Inflow Area = 0.132 ac, 10.96% Impervious, Inflow Depth = 1.01" for 100-Year Event event Inflow = 0.11 cfs @ 12.12 hrs, Volume= 0.011 af Outflow = 0.04 cfs @ 12.52 hrs, Volume= 0.011 af, Atten= 60%, Lag= 23.7 min Discarded = 0.04 cfs @ 12.52 hrs, Volume= 0.011 af Type III 24-hr 100-Year Event Rainfall=6.50"Pre-Dev Printed 2/27/2017Prepared by Microsoft Page 11HydroCAD® 10.00 s/n 02175 © 2013 HydroCAD Software Solutions LLC Routing by Dyn-Stor-Ind method, Time Span= 5.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 96.19' @ 12.52 hrs Surf.Area= 695 sf Storage= 76 cf Plug-Flow detention time= 13.9 min calculated for 0.011 af (100% of inflow) Center-of-Mass det. time= 13.9 min ( 921.2 - 907.3 ) Volume Invert Avail.Storage Storage Description #1 96.00' 1,650 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 96.00 89 0 0 97.00 3,210 1,650 1,650 Device Routing Invert Outlet Devices #1 Discarded 96.00'2.410 in/hr Exfiltration over Surface area Conductivity to Groundwater Elevation = 95.00' Discarded OutFlow Max=0.04 cfs @ 12.52 hrs HW=96.19' (Free Discharge) 1=Exfiltration ( Controls 0.04 cfs) 1S 2S6S5R North Main 4P Back Yard 8P 4x4 chamber Routing Diagram for Post-Dev 3-16-17Prepared by Microsoft, Printed 3/17/2017 HydroCAD® 10.00 s/n 02175 © 2013 HydroCAD Software Solutions LLC Subcat Reach Pond Link Post-Dev 3-16-17 Printed 3/17/2017Prepared by Microsoft Page 2HydroCAD® 10.00 s/n 02175 © 2013 HydroCAD Software Solutions LLC Area Listing (all nodes) Area (sq-ft) CN Description (subcatchment-numbers) 4,191 39 >75% Grass cover, Good, HSG A (1S, 2S) 1,251 98 Paved parking, HSG A (1S) 712 98 Paved roads w/curbs & sewers, HSG A (2S) 2,767 98 Roofs, HSG A (1S, 6S) 8,921 70 TOTAL AREA Type III 24-hr 2-Year Event Rainfall=3.00"Post-Dev 3-16-17 Printed 3/17/2017Prepared by Microsoft Page 3HydroCAD® 10.00 s/n 02175 © 2013 HydroCAD Software Solutions LLC Time span=5.00-72.00 hrs, dt=0.05 hrs, 1341 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Runoff Area=2,788 sf 66.61% Impervious Runoff Depth=1.13"Subcatchment 1S: Tc=6.0 min CN=78 Runoff=0.08 cfs 262 cf Runoff Area=3,972 sf 17.93% Impervious Runoff Depth=0.09"Subcatchment 2S: Tc=6.0 min CN=50 Runoff=0.00 cfs 30 cf Runoff Area=2,161 sf 100.00% Impervious Runoff Depth>2.72"Subcatchment 6S: Tc=6.0 min CN=98 Runoff=0.14 cfs 490 cf Inflow=0.08 cfs 262 cfReach 5R: North Main Outflow=0.08 cfs 262 cf Peak Elev=97.00' Storage=0 cf Inflow=0.00 cfs 30 cfPond 4P: Back Yard Outflow=0.00 cfs 30 cf Peak Elev=93.89' Storage=0.003 af Inflow=0.14 cfs 490 cfPond 8P: 4x4 chamber Outflow=0.04 cfs 490 cf Total Runoff Area = 8,921 sf Runoff Volume = 782 cf Average Runoff Depth = 1.05" 46.98% Pervious = 4,191 sf 53.02% Impervious = 4,730 sf Type III 24-hr 2-Year Event Rainfall=3.00"Post-Dev 3-16-17 Printed 3/17/2017Prepared by Microsoft Page 4HydroCAD® 10.00 s/n 02175 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Runoff = 0.08 cfs @ 12.10 hrs, Volume= 262 cf, Depth= 1.13" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-72.00 hrs, dt= 0.05 hrs Type III 24-hr 2-Year Event Rainfall=3.00" Area (sf) CN Description 606 98 Roofs, HSG A 1,251 98 Paved parking, HSG A 931 39 >75% Grass cover, Good, HSG A 2,788 78 Weighted Average 931 33.39% Pervious Area 1,857 66.61% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Summary for Subcatchment 2S: Runoff = 0.00 cfs @ 13.77 hrs, Volume= 30 cf, Depth= 0.09" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-72.00 hrs, dt= 0.05 hrs Type III 24-hr 2-Year Event Rainfall=3.00" Area (sf) CN Description 712 98 Paved roads w/curbs & sewers, HSG A 3,260 39 >75% Grass cover, Good, HSG A 3,972 50 Weighted Average 3,260 82.07% Pervious Area 712 17.93% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Summary for Subcatchment 6S: Runoff = 0.14 cfs @ 12.09 hrs, Volume= 490 cf, Depth> 2.72" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-72.00 hrs, dt= 0.05 hrs Type III 24-hr 2-Year Event Rainfall=3.00" Area (sf) CN Description 2,161 98 Roofs, HSG A 2,161 100.00% Impervious Area Type III 24-hr 2-Year Event Rainfall=3.00"Post-Dev 3-16-17 Printed 3/17/2017Prepared by Microsoft Page 5HydroCAD® 10.00 s/n 02175 © 2013 HydroCAD Software Solutions LLC Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Summary for Reach 5R: North Main Inflow Area = 2,788 sf, 66.61% Impervious, Inflow Depth = 1.13" for 2-Year Event event Inflow = 0.08 cfs @ 12.10 hrs, Volume= 262 cf Outflow = 0.08 cfs @ 12.10 hrs, Volume= 262 cf, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-72.00 hrs, dt= 0.05 hrs Summary for Pond 4P: Back Yard Inflow Area = 3,972 sf, 17.93% Impervious, Inflow Depth = 0.09" for 2-Year Event event Inflow = 0.00 cfs @ 13.77 hrs, Volume= 30 cf Outflow = 0.00 cfs @ 13.77 hrs, Volume= 30 cf, Atten= 0%, Lag= 0.0 min Discarded = 0.00 cfs @ 13.77 hrs, Volume= 30 cf Routing by Dyn-Stor-Ind method, Time Span= 5.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 97.00' @ 5.00 hrs Surf.Area= 645 sf Storage= 0 cf Plug-Flow detention time= (not calculated: outflow precedes inflow) Center-of-Mass det. time= 0.0 min ( 1,034.9 - 1,034.9 ) Volume Invert Avail.Storage Storage Description #1 97.00' 823 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 97.00 645 0 0 98.00 1,000 823 823 Device Routing Invert Outlet Devices #1 Discarded 97.00'2.410 in/hr Exfiltration over Surface area Conductivity to Groundwater Elevation = 95.00' Discarded OutFlow Max=0.00 cfs @ 13.77 hrs HW=97.00' (Free Discharge) 1=Exfiltration (Passes 0.00 cfs of 0.04 cfs potential flow) Summary for Pond 8P: 4x4 chamber Inflow Area = 2,161 sf,100.00% Impervious, Inflow Depth > 2.72" for 2-Year Event event Inflow = 0.14 cfs @ 12.09 hrs, Volume= 490 cf Outflow = 0.04 cfs @ 12.41 hrs, Volume= 490 cf, Atten= 70%, Lag= 19.1 min Discarded = 0.04 cfs @ 12.41 hrs, Volume= 490 cf Routing by Dyn-Stor-Ind method, Time Span= 5.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 93.89' @ 12.41 hrs Surf.Area= 0.003 ac Storage= 0.003 af Flood Elev= 99.00' Surf.Area= 0.004 ac Storage= 0.008 af Type III 24-hr 2-Year Event Rainfall=3.00"Post-Dev 3-16-17 Printed 3/17/2017Prepared by Microsoft Page 6HydroCAD® 10.00 s/n 02175 © 2013 HydroCAD Software Solutions LLC Plug-Flow detention time= (not calculated: outflow precedes inflow) Center-of-Mass det. time= 16.4 min ( 783.4 - 767.0 ) Volume Invert Avail.Storage Storage Description #1 92.00' 0.003 af 6.00'W x 14.00'L x 4.50'H Prismatoid Z=0.5 0.014 af Overall - 0.006 af Embedded = 0.008 af x 40.0% Voids #2 92.50' 0.004 af 4.00'W x 4.00'L x 4.00'H Prismatoid x 3 Inside #1 0.006 af Overall - 4.0" Wall Thickness = 0.004 af 0.008 af Total Available Storage Device Routing Invert Outlet Devices #1 Discarded 92.00'8.340 in/hr Exfiltration over Surface area Conductivity to Groundwater Elevation = 90.00' Discarded OutFlow Max=0.04 cfs @ 12.41 hrs HW=93.89' (Free Discharge) 1=Exfiltration ( Controls 0.04 cfs) Type III 24-hr 10-Year Event Rainfall=4.50"Post-Dev 3-16-17 Printed 3/17/2017Prepared by Microsoft Page 7HydroCAD® 10.00 s/n 02175 © 2013 HydroCAD Software Solutions LLC Time span=5.00-72.00 hrs, dt=0.05 hrs, 1341 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Runoff Area=2,788 sf 66.61% Impervious Runoff Depth=2.29"Subcatchment 1S: Tc=6.0 min CN=78 Runoff=0.17 cfs 533 cf Runoff Area=3,972 sf 17.93% Impervious Runoff Depth=0.50"Subcatchment 2S: Tc=6.0 min CN=50 Runoff=0.03 cfs 165 cf Runoff Area=2,161 sf 100.00% Impervious Runoff Depth>4.16"Subcatchment 6S: Tc=6.0 min CN=98 Runoff=0.21 cfs 749 cf Inflow=0.17 cfs 533 cfReach 5R: North Main Outflow=0.17 cfs 533 cf Peak Elev=97.00' Storage=0 cf Inflow=0.03 cfs 165 cfPond 4P: Back Yard Outflow=0.03 cfs 166 cf Peak Elev=94.93' Storage=0.004 af Inflow=0.21 cfs 749 cfPond 8P: 4x4 chamber Outflow=0.06 cfs 749 cf Total Runoff Area = 8,921 sf Runoff Volume = 1,447 cf Average Runoff Depth = 1.95" 46.98% Pervious = 4,191 sf 53.02% Impervious = 4,730 sf Type III 24-hr 10-Year Event Rainfall=4.50"Post-Dev 3-16-17 Printed 3/17/2017Prepared by Microsoft Page 8HydroCAD® 10.00 s/n 02175 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Runoff = 0.17 cfs @ 12.09 hrs, Volume= 533 cf, Depth= 2.29" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-72.00 hrs, dt= 0.05 hrs Type III 24-hr 10-Year Event Rainfall=4.50" Area (sf) CN Description 606 98 Roofs, HSG A 1,251 98 Paved parking, HSG A 931 39 >75% Grass cover, Good, HSG A 2,788 78 Weighted Average 931 33.39% Pervious Area 1,857 66.61% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Summary for Subcatchment 2S: Runoff = 0.03 cfs @ 12.16 hrs, Volume= 165 cf, Depth= 0.50" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-72.00 hrs, dt= 0.05 hrs Type III 24-hr 10-Year Event Rainfall=4.50" Area (sf) CN Description 712 98 Paved roads w/curbs & sewers, HSG A 3,260 39 >75% Grass cover, Good, HSG A 3,972 50 Weighted Average 3,260 82.07% Pervious Area 712 17.93% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Summary for Subcatchment 6S: Runoff = 0.21 cfs @ 12.09 hrs, Volume= 749 cf, Depth> 4.16" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-72.00 hrs, dt= 0.05 hrs Type III 24-hr 10-Year Event Rainfall=4.50" Area (sf) CN Description 2,161 98 Roofs, HSG A 2,161 100.00% Impervious Area Type III 24-hr 10-Year Event Rainfall=4.50"Post-Dev 3-16-17 Printed 3/17/2017Prepared by Microsoft Page 9HydroCAD® 10.00 s/n 02175 © 2013 HydroCAD Software Solutions LLC Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Summary for Reach 5R: North Main Inflow Area = 2,788 sf, 66.61% Impervious, Inflow Depth = 2.29" for 10-Year Event event Inflow = 0.17 cfs @ 12.09 hrs, Volume= 533 cf Outflow = 0.17 cfs @ 12.09 hrs, Volume= 533 cf, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-72.00 hrs, dt= 0.05 hrs Summary for Pond 4P: Back Yard Inflow Area = 3,972 sf, 17.93% Impervious, Inflow Depth = 0.50" for 10-Year Event event Inflow = 0.03 cfs @ 12.16 hrs, Volume= 165 cf Outflow = 0.03 cfs @ 12.16 hrs, Volume= 166 cf, Atten= 0%, Lag= 0.0 min Discarded = 0.03 cfs @ 12.16 hrs, Volume= 166 cf Routing by Dyn-Stor-Ind method, Time Span= 5.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 97.00' @ 12.15 hrs Surf.Area= 645 sf Storage= 0 cf Plug-Flow detention time= (not calculated: outflow precedes inflow) Center-of-Mass det. time= 0.0 min ( 929.9 - 929.9 ) Volume Invert Avail.Storage Storage Description #1 97.00' 823 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 97.00 645 0 0 98.00 1,000 823 823 Device Routing Invert Outlet Devices #1 Discarded 97.00'2.410 in/hr Exfiltration over Surface area Conductivity to Groundwater Elevation = 95.00' Discarded OutFlow Max=0.04 cfs @ 12.16 hrs HW=97.00' (Free Discharge) 1=Exfiltration ( Controls 0.04 cfs) Summary for Pond 8P: 4x4 chamber Inflow Area = 2,161 sf,100.00% Impervious, Inflow Depth > 4.16" for 10-Year Event event Inflow = 0.21 cfs @ 12.09 hrs, Volume= 749 cf Outflow = 0.06 cfs @ 12.43 hrs, Volume= 749 cf, Atten= 72%, Lag= 20.5 min Discarded = 0.06 cfs @ 12.43 hrs, Volume= 749 cf Routing by Dyn-Stor-Ind method, Time Span= 5.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 94.93' @ 12.43 hrs Surf.Area= 0.003 ac Storage= 0.004 af Flood Elev= 99.00' Surf.Area= 0.004 ac Storage= 0.008 af Type III 24-hr 10-Year Event Rainfall=4.50"Post-Dev 3-16-17 Printed 3/17/2017Prepared by Microsoft Page 10HydroCAD® 10.00 s/n 02175 © 2013 HydroCAD Software Solutions LLC Plug-Flow detention time= (not calculated: outflow precedes inflow) Center-of-Mass det. time= 23.4 min ( 786.6 - 763.2 ) Volume Invert Avail.Storage Storage Description #1 92.00' 0.003 af 6.00'W x 14.00'L x 4.50'H Prismatoid Z=0.5 0.014 af Overall - 0.006 af Embedded = 0.008 af x 40.0% Voids #2 92.50' 0.004 af 4.00'W x 4.00'L x 4.00'H Prismatoid x 3 Inside #1 0.006 af Overall - 4.0" Wall Thickness = 0.004 af 0.008 af Total Available Storage Device Routing Invert Outlet Devices #1 Discarded 92.00'8.340 in/hr Exfiltration over Surface area Conductivity to Groundwater Elevation = 90.00' Discarded OutFlow Max=0.06 cfs @ 12.43 hrs HW=94.93' (Free Discharge) 1=Exfiltration ( Controls 0.06 cfs) Type III 24-hr 100-Year Event Rainfall=6.50"Post-Dev 3-16-17 Printed 3/17/2017Prepared by Microsoft Page 11HydroCAD® 10.00 s/n 02175 © 2013 HydroCAD Software Solutions LLC Time span=5.00-72.00 hrs, dt=0.05 hrs, 1341 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Runoff Area=2,788 sf 66.61% Impervious Runoff Depth=4.02"Subcatchment 1S: Tc=6.0 min CN=78 Runoff=0.29 cfs 935 cf Runoff Area=3,972 sf 17.93% Impervious Runoff Depth=1.40"Subcatchment 2S: Tc=6.0 min CN=50 Runoff=0.12 cfs 462 cf Runoff Area=2,161 sf 100.00% Impervious Runoff Depth>6.07"Subcatchment 6S: Tc=6.0 min CN=98 Runoff=0.31 cfs 1,093 cf Inflow=0.29 cfs 935 cfReach 5R: North Main Outflow=0.29 cfs 935 cf Peak Elev=97.11' Storage=74 cf Inflow=0.12 cfs 462 cfPond 4P: Back Yard Outflow=0.04 cfs 463 cf Peak Elev=96.19' Storage=0.007 af Inflow=0.31 cfs 1,093 cfPond 8P: 4x4 chamber Outflow=0.08 cfs 1,093 cf Total Runoff Area = 8,921 sf Runoff Volume = 2,490 cf Average Runoff Depth = 3.35" 46.98% Pervious = 4,191 sf 53.02% Impervious = 4,730 sf Type III 24-hr 100-Year Event Rainfall=6.50"Post-Dev 3-16-17 Printed 3/17/2017Prepared by Microsoft Page 12HydroCAD® 10.00 s/n 02175 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Runoff = 0.29 cfs @ 12.09 hrs, Volume= 935 cf, Depth= 4.02" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-72.00 hrs, dt= 0.05 hrs Type III 24-hr 100-Year Event Rainfall=6.50" Area (sf) CN Description 606 98 Roofs, HSG A 1,251 98 Paved parking, HSG A 931 39 >75% Grass cover, Good, HSG A 2,788 78 Weighted Average 931 33.39% Pervious Area 1,857 66.61% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Summary for Subcatchment 2S: Runoff = 0.12 cfs @ 12.11 hrs, Volume= 462 cf, Depth= 1.40" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-72.00 hrs, dt= 0.05 hrs Type III 24-hr 100-Year Event Rainfall=6.50" Area (sf) CN Description 712 98 Paved roads w/curbs & sewers, HSG A 3,260 39 >75% Grass cover, Good, HSG A 3,972 50 Weighted Average 3,260 82.07% Pervious Area 712 17.93% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Summary for Subcatchment 6S: Runoff = 0.31 cfs @ 12.09 hrs, Volume= 1,093 cf, Depth> 6.07" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-72.00 hrs, dt= 0.05 hrs Type III 24-hr 100-Year Event Rainfall=6.50" Area (sf) CN Description 2,161 98 Roofs, HSG A 2,161 100.00% Impervious Area Type III 24-hr 100-Year Event Rainfall=6.50"Post-Dev 3-16-17 Printed 3/17/2017Prepared by Microsoft Page 13HydroCAD® 10.00 s/n 02175 © 2013 HydroCAD Software Solutions LLC Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Summary for Reach 5R: North Main Inflow Area = 2,788 sf, 66.61% Impervious, Inflow Depth = 4.02" for 100-Year Event event Inflow = 0.29 cfs @ 12.09 hrs, Volume= 935 cf Outflow = 0.29 cfs @ 12.09 hrs, Volume= 935 cf, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-72.00 hrs, dt= 0.05 hrs Summary for Pond 4P: Back Yard Inflow Area = 3,972 sf, 17.93% Impervious, Inflow Depth = 1.40" for 100-Year Event event Inflow = 0.12 cfs @ 12.11 hrs, Volume= 462 cf Outflow = 0.04 cfs @ 12.51 hrs, Volume= 463 cf, Atten= 67%, Lag= 24.3 min Discarded = 0.04 cfs @ 12.51 hrs, Volume= 463 cf Routing by Dyn-Stor-Ind method, Time Span= 5.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 97.11' @ 12.51 hrs Surf.Area= 684 sf Storage= 74 cf Plug-Flow detention time= (not calculated: outflow precedes inflow) Center-of-Mass det. time= 9.7 min ( 896.7 - 887.0 ) Volume Invert Avail.Storage Storage Description #1 97.00' 823 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 97.00 645 0 0 98.00 1,000 823 823 Device Routing Invert Outlet Devices #1 Discarded 97.00'2.410 in/hr Exfiltration over Surface area Conductivity to Groundwater Elevation = 95.00' Discarded OutFlow Max=0.04 cfs @ 12.51 hrs HW=97.11' (Free Discharge) 1=Exfiltration ( Controls 0.04 cfs) Summary for Pond 8P: 4x4 chamber Inflow Area = 2,161 sf,100.00% Impervious, Inflow Depth > 6.07" for 100-Year Event event Inflow = 0.31 cfs @ 12.09 hrs, Volume= 1,093 cf Outflow = 0.08 cfs @ 12.44 hrs, Volume= 1,093 cf, Atten= 74%, Lag= 21.4 min Discarded = 0.08 cfs @ 12.44 hrs, Volume= 1,093 cf Routing by Dyn-Stor-Ind method, Time Span= 5.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 96.19' @ 12.44 hrs Surf.Area= 0.004 ac Storage= 0.007 af Flood Elev= 99.00' Surf.Area= 0.004 ac Storage= 0.008 af Type III 24-hr 100-Year Event Rainfall=6.50"Post-Dev 3-16-17 Printed 3/17/2017Prepared by Microsoft Page 14HydroCAD® 10.00 s/n 02175 © 2013 HydroCAD Software Solutions LLC Plug-Flow detention time= (not calculated: outflow precedes inflow) Center-of-Mass det. time= 30.5 min ( 791.6 - 761.1 ) Volume Invert Avail.Storage Storage Description #1 92.00' 0.003 af 6.00'W x 14.00'L x 4.50'H Prismatoid Z=0.5 0.014 af Overall - 0.006 af Embedded = 0.008 af x 40.0% Voids #2 92.50' 0.004 af 4.00'W x 4.00'L x 4.00'H Prismatoid x 3 Inside #1 0.006 af Overall - 4.0" Wall Thickness = 0.004 af 0.008 af Total Available Storage Device Routing Invert Outlet Devices #1 Discarded 92.00'8.340 in/hr Exfiltration over Surface area Conductivity to Groundwater Elevation = 90.00' Discarded OutFlow Max=0.08 cfs @ 12.44 hrs HW=96.19' (Free Discharge) 1=Exfiltration ( Controls 0.08 cfs)