Descripción: Handbook of Engineering Hydrology Gideon
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Definition of Runoff Portions of Runoff Runoff Process Surface Runoff Channel Runoff Factors Affecting Runoff Runoff Cycle Conditions of Runoff Cycle Summary of Rainfall – Runoff Cyc…Full description
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Engineering Hydrology Tutorial 1: Water balance
1: A river reach had a food wave passing through it. At a given instant the storage o the water was estimated as 15.5 ha.m. What would be the storage in the reach ater an interval o 3 hours i the average infow and outfow during the time period are 14.2m 3s and 1!."m3s respectivel#$ 2. %stimate the constant rate o withdrawal rom a 13&5 ha reservoir reservoir in a month o 3! da#s during which the reservoir level dropped b# !.&5 m in spite o an average infow into the reservoir o !.5 million m 3da#. 'uring the month the average seepage loss rom the reservoir was 2.5 cm( total precipitation precipitation was 1).5 cm and evaporation was *.5 cm. 3. A small catchment o area 15! ha received a rainall o 1!.5 cm in *! minutes due to a storm. At the outlet o the catchment( the stream draining the catchment was dr# beore the storm and e+perience a runo, lasting or 1! hours with an average discharge value o 2m 3s. the stream was again dr# ater the runo, event: a- what is the amount o water which was not available to runo, due to combined e,ect o inltration( evaporation evaporation and transpiration$ b- what is the ratio o runo, to the precipitation$ precipitation$ 4. A catchment area o 14! /m 2 received 12! cm rainall in a #ear. At the outlet o the catchment( the fow in the stream draining the catchment was ound to have an average rate o 2m 3s or 3 months0 3m3s or " months and 5m 3s or 3 months. alculate the runo, coecient o the catchment. the a,orestation o the catchment reduced the runo, coecient o the catchment to !.5( what is the increase in the abstraction rom the precipitation due to inltration( inltration( evaporation and transpiration( transpiration( or the same annual rainall 13! cm$ 5. ind out the water balance or epal. 6ee http:www.ao.orgnrwaterespimcountr#nepalinde+2.stm and tr# to understand how it is calculated.
1. A catchment has seven raingauge stations. n a #ear( the annual rainalls in cm recorded b# the gauges are as ollows: 13!( 142.1( 11).2( 1!).5( 1"5.2( 1!2.1 and 14".*. or 59 error in the estimation o the mean rainall( calculate the minimum number o additional stations re7uired to be established in the catchment. 2. he precipitation or a certain basin has been recorded or several #ears at 5 gauges. he data at one o the gauges ;site <- is suspected to be inconsistent relative to that at the other our sites. he table below shows data or < and the average data or the other our sites ;called =-. ;a- Anal#>e the consistenc# o the data at < b# the double mass method. ;b- Ad?ust the data o the earlier #ears at < ;so that the# are consistent with those o recent #ears-.
3. he annual precipitation at station @ and the average annu al precipitation at 1! neighbouring station are as ollows: Year
1!" 1!# 1!' 1!$
Precipita tion at Z(mm) #$ #! # #$
10 stations average( mm) "% " #1 "!
Year
1%0 1%1 1%" 1%#
Precipita tion at Z(mm) #0 #1 #$ #%
10 stations average( mm) "& #1 #& #
1!& #0 "$ 1%' '0 '' 1!! "$ "1 1%$ "% #" 1!% "0 1! 1%& "$ #0 1! "' "1 1%! "1 "# se double mass curve anal#sis to correct an# data incosistencies at station @. * +,T-. ./.,/T-* HEET
