CEIE 340 Lecture 7 Peak Discharge

# CEIE 340 Lecture 7 Peak Discharge - Peak-Discharge...

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1 Water Resource Engineering CEIE 340 Sayedul H. Choudhury, Ph.D. Peak-Discharge Estimation Today’s Topics s Introduction s Single-Return-Period Equations s USGS Urban-Peak-Discharge Formulas s Index-Flood Estimation s Moment Estimation s Rational Method s Procedure s Runoff Coefficient for Nonhomogeneous Areas s Designs on Subdivided Watersheds

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2 Today’s Topics (Cont’d) s The Soil Conservation Service (SCS) Rainfall- Runoff Depth Relation s Conceptual Model s Runoff depth Estimation s The SCS Graphical-Peak-Discharge Method s The Ia/P Parameter s Peak-Discharge Computation s Pond-and-Swamp Adjustment s Limitations s Slope-Area Method of Discharge Estimation s Peak-Discharge Envelope Curves s Regionalization of Hydrologic Variables Hydrologic Cycle Peak-Discharge
3 Instances of Peak-Discharge Estimates Single-Return-Period Equation s Determines Peak-Discharge for ungaged areas s Takes the following form: s Use multiple regression analysis after logarithmic transformation s Example variables: drainage area, channel slope, channel length, precipitation, drainage density, etc p b p b b b p X X X X b q K 3 2 1 3 2 1 0 =

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4 USGS Regression Equations s National Flood Frequency (NFF) Program s Link: http://water.usgs.gov/software/nff.html s Scientists analyzed gage data to derive a set of equation for each region s A State by State list of documents providing the detail of Regional Regression Equations
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## This note was uploaded on 11/11/2009 for the course CEIE 340 taught by Professor Choudhury during the Spring '09 term at George Mason.

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CEIE 340 Lecture 7 Peak Discharge - Peak-Discharge...

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