32C-141 (64) Caroline Misch
Page 2 of 2
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full is approximately 4.4 c.f.s. and the flow capacity with 4 feet of surcharge is
approximately 8.1 c.f.s. according to Page 5-24 of"Design"by E. Seelye.
It should be noted that the pipe in question is outside the limit of work for the proposed
project, and no alteration of any structure outside the project limits has been
contemplated. We believe that the fact that we are reducing the flow of runoff to this pipe
is sufficient to meet our responsibility for this project.
I trust that this information answers the concern of the City in regard to this matter. If
there are any further questions in this regard, please call me at (413) 529-1700.
Sincerely,
Jan L. Kuniholm, PLS
Project Manager
E. B. Holmberg &Associates
Land Surveyors
N
Y
E. B. Holm berg&Associa
SURVEYORS
August 15, 2001
Ms. Caroline Misch
City of Northampton
Planning Department
City Hall
210 Main Street
Northampton, MA 01060
RE: Millbank Affordable Housing, Proposed Project at rear of Michelman Avenue
Dear Caroline:
This letter is in response to a request from the City Engineering Department that we
provide the following information to you in writing for the consideration of the Planning
Board.
In a Memorandum to the Chairman of the Planning Board dated July 25, 2001, Ned
Huntley, Assistant City Engineer, questioned whether the 12" OUT pipe located within
the Drainage Easement in the southeasterly corner of the property, near Millbank
Ave/Pound Lane, (southeast of the existing building at 79 Michelman Ave) was sufficient
to handle all of the water coming into it.
Our calculations indicate that the flow into the pipe in question should be 8 c.f.s. in the
100 year storm in existing conditions, and 6 c.f.s. in the 100 year storm in the proposed
conditions—this indicates the flow from our area to this pipe will be decreased by our
project by 2 c.f.s. in the 100 year storm event, and proportionately in smaller storm
events.
The outflow pipe in question is a 12" pipe running for about 90 feet at a slope of 2.37%
and discharging into the"old Mill River bed."The rim of the manhole from which the
pipe runs is 4.6 feet above the top of the pipe. The normal capacity of this pipe flowing
87 Union Street Easthampton, Massachusetts 01027-09.15
Telephone: (113) 529-1700 Facsimile: (113) 529-2237
e-mail: ebha(aebholmberg.com
Sac -/
City of Northampton, Massachusetts ) pg� Tp
Office of Planning and Development
City Hall • 210 Main Street
Northampton, MA 01060 - (413) 586-6950
FAX (413) 586-3726
• Community and Economic Development A �,
• Conservation •Historic Preservation �Iv 2 Q
• Planning Board • Zoning Board of Appeals i^9
• Northampton Parking Commission DEPT OF BUILDING INSPECTIONS
NORTNA,!yPTON,MA 0106O
TO: Anthony Patillo, Building Inspector
RE: Permit application
FROM: Angela Dion, Board Secretary/OPD
DATE: / / xa 90 -'1bU/
Would you please review and return the
enclosed _ o -,
before the lanning Board oning Board of
Appeals meeting scheduled for o so
that we can advise the Boards of any
concerns you may have.
Thank you.