HomeMy WebLinkAbout2006-05-30 Stormwater Mgmt Report II i
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Title Peak Flow Credit Summary-Merrimack College Storm water Management Plan(including 25%lrnj�ervlous Coverage Increase Beyond Master Plan)
Project Merrimack College Drainage-Andover/North Andover, MA SA#71897.00
Date 01-May-2001
Rev: 6/18/2001; 12/13/02; 3/26/03
Analysis Point-Football Field Detention Basin
'(Peak Flow Values in Cubic Feet per Second(cfs))
Benefit Benefit
AB C D=(C-A) E F O (B-E) H
Master Plan-Peak flow Football field d-basin
Existing peak flow Master Plan-Full Build Master Plan-Increase in Peak flow discharge after Master Plan-Full build out discharge reduction @ discharge-peak flow
Rainfall Existing peak flow discharging from out peak flow entering net peak flow prior to d-basin const.but prior to peak flow discharging from Football field d-basin vs. decrease vs,existing
Amount(in) Design Storm entering football field football field Football Field new d-basin cost. Master Plan build-out new d-basin exist.cond. conditions(%)
3.4" 2 Year Storm 57 17 73 16 12 12 5 28%
5.0" 10 Year Storm 215 45 246 31 16 16 29 64%
5.8" 25 Year Storm 293 81 337 44 •17 17 64 79%
6.2" 50 Year Storm 336 107 385. 49 18 18 90 83%
6.4" 100 Year Storm 349 118 401 18 18 100 85%
Analysis Point-Elm Street Detention Basin
'(Peak Flow Values in Cubic Feet per Second(cfs))
A B C Benefit Benefit
D�(C-A). F G=(B-E) H
(MIA-1A)+(M-1A-1B) (M-1A-1A)+(M-1A'l8) (M-IA-IA)+(M-1A�113) (M-1A-1A)+(M-to-18) (M-1A1A)+(M4A-IB) (M-1A-19A)+(M-1A18)
Existing peak flow at Master Plan-Peak flow Elm Street d-basin
Elm Street Basin site Existing peak flow Master Plan-Full Build Master Plan-Increase In Master Plan-Full build discharge reduction O Elm discharge-peak flow.
Rainfall (prior to rerouting routed to Elm Street out peak flow routed to net peak flow prkr to out peak flow discharging Street d-basin vs.exist decrease vs,existing
Amount(in) Design Storm watersheds) Basin site Elm Street basin now d-basin cortst. from new d-basin cond. conditions(%)
3.4" 2 Year Storm 10 42 50 $ 21 29 50% _
5.0" 10 Year Storm 22 74 83 9 28 55 62%
5.8" 25 Year Storm 27 88 97 9 30 67 $6%
6.2" 50 Year Storm 31 97 107 10 31 76 68%
6.4 100 Year Storm 32 100 110 : , 32 78 68%
Analysis Point-Berry Brook, downstream of campus
,*(Peak.Flow Values In Cubic Feet per Second(cfs))
Benefit
---- ---------...,,......___................_..._—:...__......_�......_�f
Percentage Peak Flow
Mitigated peak flows- Attenuation due to a
controlled and Merrimack College a Peak Flow Credit Net Increase in peak j
Rainfall uncontrolled Storm water Management a e e SummaryAdjustement runoff_rate for 100 yr Remaining Peak Flow !
Amount(in) Design Storm Existing Peak Flows watersheds Project a s by Project Date storm(cfs) Credits(cfs)
3.4" 2 Year Storm 91 - 49 46% -5.0" �Sophomors Housing 2/25/2002 3.40
58.60
10 Year Storm 152 83 45% itot D-Parking tot Ext. 3/26/2003 11.50 47.10
5.8" 25 Year Storm 179 97 46% �Monlean Blvd. Relocation 5/11/2004 _2 54 49 64
6,2" 50 Year Storm 198 106 46% (Game Field Renovation 3/22/2005 01,00 49•64
6.4 100 Year Storm 204 109 46% EIm. St:.' Entrance 5 02 2006 6g
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Merrimack College Drainage Study __� � �"""
SAtl7 0897.00 Peak Flow Credit Summary
Merrimack Nyd:olog}'7-2s Od.XLS May 1,2001
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