450-SMR-documentation-checklist NorthamptonCRS Documentation Checklist
Element SMR—stormwater managementregulations
Activity 450 (Stormwater Management)of the Community Rating System (CRS) focuses on preventing increases in flood frequencies, durations, peak flows, sediment, and negative impacts on
water quality. It is based on the principle that managing increases in stormwater due to changes in land use is best achievedon-site by the developer at the time of development,in combination
with the community’s watershed-based efforts to prevent loss of life, property damage, and habitatdestruction.These credited activities focus on preventing an increase in risk to existing
structures, future structures, and the erosion and sedimentation of streams.
This checklist is provided to help communities submitthe proper documentation to allow for verification of CRS credit for element SMR—stormwater management regulations, which includes
sub-elements SZ, DS, LID and PUB. It does not include the documentation requirements for elements WMP, ESC or WQ.Size of development(sub-element SZ) is aimed at crediting the community
for maximizing the types of development subject to on-site quantity control. (up to 110 points).Design storms(sub-element DS)looks at the storm events used by the community to determine
compliance with their regulations for no increase in peak flow and/or volume caused by new development (up to 225 points).Low impact development(sub-element LID) credit is provided for
requiring the use of LID techniques to the maximum extent possible to reduce all design storms from the site prior to providing detention to meet the standards (up to 25 points).Public
maintenance of required facilities(sub-element PUB)ensures that the community has the right to inspect and force maintenance by private owners of storage facilities that were required
to meet the requirements of SZ and DS (20 points).
The community must receive some credit forboth SZ and DS in order to receive any creditfor element SMR. For more details, refer to the 2017CRS Coordinator’s Manual,the 2021 Addendum,
andCRS Credit for Stormwater Management.
If you have any questions about thischecklist, please contact Shauna Urlacher at shauna@urbanhydroeng.comor by phone at 708-253-7993.CRS Documentation ChecklistElement SMR—stormwater
management regulations
NEWAPPLICATION MODIFICATIONX CYCLE DOCUMENTATIONProvide this checklist and the following for each item checked:X(1) A thumb drive with a searchable pdf of each document submitted including
a short description of your regulations and when you require onsite detention or retention of increased flows. Note the file name and the appropriate pages and section numbers for each
element; orX(2) The URL for on-line documents with the appropriate pages and exact section numbers noted; or (3) A paper copy of the documents with the appropriate acronym marked in
the margin were the requirements for sub-elements SZ, DS, LID and PUB are found.
Stormwater Manager
CRS Coordinator
Name
Douglas McDonald
Sarah LaValley
Title
Stormwater Coordinator
Conservation and Preservation Planner
Phone
413-587-1582
413-587-1263
E-mail
dmcdonald@northamptonma.gov
slavalley@northamptonma.gov
Form Completed By:
Sarah LaValley
Date:
May 4 2021
Comments:
Credit Criteria and Documentation
Credit criteria for this element are described in detail in Section 452.a of the 2017 CRS Coordinator’s Manual. There is no need to submit more than one copy of a design manual or regulatory
section if it can be used to document separate sub-elements. Instead, in each section clearly indicate where to find the desired criteria, SZ, and exemptions, for instance. Submission
of a short, written description of your program detailing what developments are required to provide onsite control and the standards they must meet to show compliance is helpful.1.SZ
documentation List the regulationordesign manual name and sectionor page numberthat shows:The kinds of development that are regulated (i.e., size of development or disturbed area that
triggers stormwater management requirements).The kinds of development that are exempt from the requirement (e.g., single-family development, developments less than 1 acre, etc.). Construction
activities of any kind that disturb greater than one (1) acre (43,560 square feet) or are part of a common plan of development or sale that will disturb greater than one (1) acre must
have an approved stormwater management permit or a waiver of the requirement for a stormwater management permit from the Northampton Department of Public Works See https://ma-northampton.civicplus.com/763/Stormwater-Permits
for additional informatiomHave you attached a copy of the regulation or design manual with the above referenced sections highlighted? Yes. The CRS must be able to search and mark on
this copy of the document. If your stormwater management regulations are availableonline, provide the website below.https://ecode360.com/13265221If any development larger than 5 acres
or new impervious surface greater than 20,000 square feet is exempt from stormwater management regulation there is no credit, i.e., SMR = 0.2. DS documentationAttach a copy of the
regulation or design manual that describes the event(s) the developer’s engineer must use to demonstrate that the post-development flow will be no greater than the pre-development flow
for the area being disturbed.If you do not require control of the 10-year or less-frequent event on-site, there is no credit. Highlight the specific requirement and give the exact location
of the requirement below.Section281-6 of the Code requires that peak flows for the 10-year event must not be increased.If the design storm is less than the 10-year event there is no
credit, SMR = 0.Do you allow the use of the Modified Rational Method to design detention facilities for development greater than one-acre is size? No3.Required ExamplesAttach excerpts
fromfive drainage reportsprepared by the developer’s engineer. These reports mustshow that the post-development flows for each required design event are no greater than the pre-developed
flows for the area being disturbed. There must be a clear description of the pre-development peak flows in comparison to the post-development peak flows for each required event. Copies
of the actual modelsor plan sheets areunnecessary. Excerpts should includeName ofdevelopment,Date of the report,Size of the development, andPre-development and post-development flow
rates (preferably in a table).4.LID documentationAttach a copy of the regulation thatrequires all new development subject toonsite flow controls to utilize low-impact developmenttechniques
to the maximum extent possible before the design ofa retention pond or detention pond to reduce flows to meet your flow control standards credited in DS.Section 281-35.PUB documentationAttach
a copy of the regulation that allows the community either to enter all stormwater storage facilities required by the regulations andrepair them whenever necessary or to require the owner
todo so.Section 281-8