Report

Land Resource and Hydrological Inventory of KarkihalliSub-watershed for Watershed Planning and Development Koppal Taluk, Koppal District, Karnataka (AESR 3.0)

author(s) RajendraHegde - K.V.Niranjana - S.Srinivas - B.A.Dhanorkar - R.S.ReddyandS.K.Singh
from Indian Council of Agricultural Research (ICAR)
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  • Northern Europe
  • Europe
  • World
  • Southern Asia
  • Asia
citation

RajendraHegde,K.V.Niranjana,S.Srinivas,B.A.Dhanorkar,R.S.ReddyandS.K.Singh(2019).“LandResourceandHydrologicalInventoryofKarkihalliSub-watershed(SWs)forWatershedPlanningandDevelopment,KoppalTaluk,KoppalDistrict,Karnataka”,SujalaSWs-LRIAtlasNo.10,ICAR–NBSS&LUP,RC,Bangalore.p.65

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Abstract

Theaverageannualrainfallof631mmintheKarkihallisub-watershedasrecordedfromtheKoppalstationdatabyKSNDMC. 65percent,20percentand15percentoftheannualrainfalloccursduringkharif,rabiandsummerseasonsrespectivelyandexhibitedahighertemporalvariability. Theevapotranspirationestimationtooldevelopedindicatesthatthewatershedwaterbalanceisindeficit.Thecropping&irrigationchoicesarenotappropriateandneedtobealteredtoshiftthedeficitwaterbalance. Theestimatedrunoffavailabletouseis62mmforanannualrainfallof596mm(2009-2017).Theutilizablegroundwateris30.8mm(70%of44mmrechargeestimated).Thismeansthetotalavailablewaterresourcecombiningthesoilmoisturestoreforkharif&rabi(208mm)andutilizablerunoffplusrechargeis300.8mm(=62+208+30.8). Theaverageactualevapotranspirationestimatedinthewatershedbasedonthecurrentlanduseandirrigationpracticesforthekharifandrabiseasonsis596mm.Hencetheamountofwateruseforkharifandrabiseasonsmaybeestimatedas745mm(i.e.125%ofAET).Thisdemandforthetwoseasonsismarginallyhigherby445mm,i.e.(745-300).TheAETinJune-Septmonthsis80%ofrainfall.Hence,thereisslightlylessopportunitytoharvesttheexcesswaterthroughwatershedmanagementpracticesforutilizingduringrabiseason. ThetotalnumberofwellspresentinKarkihalliSub-watershedasperLRIdatais185.GWLgraphdepictsthegroundwaterlevelsduringtheyears2008-2009wasdeclinedwhereasgroundwaterlevelsin2010-2016wasincreasedandgraduallydecreasedin2017

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