Hydrology - NCTCOG
storm sewer systems. Modified Rational2 0 – 200 acres Method can be used for estimating runoff volumes for storage design. Unit Hydrograph (SCS) 3 Any Size Method can be used for estimating peak flows and hydrographs for all design applications. Unit Hydrograph (Snyder’s) 4 1 acre and larger Method can be used for estimating peak flows and
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Hydrology - integrated Stormwater Management …
iswm.nctcog.orgiSWMTM Technical Manual Hydrology Hydrology HO-ii April 2010, Revised 9/2014 1.6 USGS and TxDOT Regression Methods.....
Equation List for Sizing Wet Ponds
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Hydrology - integrated Stormwater Management (iSWM)
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RAINFALL TABLES FOR NORTH CENTRAL TEXAS
iswm.nctcog.orgconversion factors. The values reported in the IDF tables are calculated directly from the fitted IDF equations. The fitted equations are only valid for rainfall durations between 5 minutes and 24 hours. 1Asquith, W.H. Depth-Duration Frequency of Precipitation for Texas. Water-Resources Investigations Report 98-4044, US Geological Survey.
Hydraulics - NCTCOG
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