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Hydrology - NCTCOG

ISWMTM Technical Manual Hydrology Hydrology : Hydrological Analysis Downstream Assessment Streambank Protection Water Balance Rainfall Tables Hydrologic Soils DataiSWMTM Technical Manual Hydrology Hydrology HO-i April 2010, Revised 9/2014 Table of Contents Hydrological Analysis .. HO-1 Estimating HO-1 Introduction to Hydrologic methods .. HO-1 Symbols and Definitions .. HO-4 Rainfall Estimation .. HO-5 rational Method .. HO-7 Introduction .. HO-7 Application .. HO-7 Equations .. HO-7 Time of Concentration .. HO-8 Rainfall Intensity (I).

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.org

iSWMTM Technical Manual Hydrology Hydrology HO-ii April 2010, Revised 9/2014 1.6 USGS and TxDOT Regression Methods.....

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Hydrology - integrated Stormwater Management (iSWM)

iswm.nctcog.org

iSWMTM 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.

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RAINFALL TABLES FOR NORTH CENTRAL TEXAS

iswm.nctcog.org

conversion 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.

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Equation List for Sizing Wet Ponds

iswm.nctcog.org

Equation 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

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iswm.nctcog.org

iSWMTM 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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Hydraulics - NCTCOG

iswm.nctcog.org

iSWMTM 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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