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Stormwater Calcs
Joel Gray
Brandon Thompson
Joel Gray
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Stormwater Calcs
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Brandon Thompson
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Joel Gray
Stormwater Calcs
Joel,
Attached are the stormwater calcs for the Darwin Matthew project in case
you didn’t have a copy.
Thanks,
Brandon R. Thompson, PE
ph. 208-745-8771
fax 208-745-6391
www.teidaho.com <http://www.teidaho.com/>
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DrainCalculations.pdfDRAIN_CALCS.xls
Drainage Calculations Darwin Matthews New 6-Plex StormTech Infiltrator Drain Drainage Area Area (s.f.) Runoff Coefficient Effective Area (s.f.) Hard Surfaces 8125 0.95 7,719
Landscaping 2080 0.20 416 Weighted Total 8,135 s.f. Soils & Drainrock Data Native Soil Perc. Rate 4.0 in/hr Washed Rock Void Ratio
0.40 Storm Data Return Interval 100 Years Intensity 1.25 in/hr Duration 1.0 hr Storm Volume 847 c.f. See attached Figure 456-05 & 456-06* SC-740 StormTech Drain Design StormTech
Chambers 5 Drainbed Height 3.5 feet Drainbed Width 11.1 feet Drainbed Length 36.9 feet Drain Rock Quantity 44.6 c.y. SC-740 Capacity 229.5 c.f. Drain Rock Capacity 481.9 c.f. Infiltration
136.6 c.f. Total Capacity 848 c.f. Result OKAY *Source - ITD Roadway Design Manual; January 2008 DRAIN_CALCS 4/24/2012
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DrainC~1.pdf
DrainCalculations.pdf
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