Hydrology - NCTCOG
Method Size Limitations1 Comments Rational 0 – 100 acres Method can be used for estimating peak flows and the design of small site or subdivision 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 ...
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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
iswm.nctcog.orgEquation List for Sizing Wet Ponds Ia/P where: Ia = initial abstraction P = accumulated rainfall obtained from rainfall tables by county in the Hydrology TM Section
Hydrology - integrated Stormwater Management (iSWM)
iswm.nctcog.orgiSWMTM Technical Manual Hydrology Hydrological Analysis HO-1 Revised 04/10 1.0 Hydrological Analysis 1.1 Estimating Runoff 1.1.1 Introduction to Hydrologic Methods Hydrology deals with estimating flow peaks, volumes, and time distributions of stormwater runoff.
Hydraulics - integrated Stormwater Management (iSWM)
iswm.nctcog.orgiSWMTM Technical Manual Hydraulics Hydraulics: 1.0 Streets and Closed Conduits 2.0 Storage Design 3.0 Open Channels, Culverts, and Bridges 4.0 Energy Dissipation
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
iswm.nctcog.orgiSWMTM Technical Manual Hydraulics Hydraulics: 1.0 Streets and Closed Conduits 2.0 Storage Design 3.0 Open Channels, Culverts, and Bridges 4.0 Energy Dissipation
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