Report

Land Resource and Hydrological Inventory of IrakallagudaSub-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).“LandResourceandHydrologicalInventoryofIrakallagudaSub-watershed(SWs)forWatershedPlanningandDevelopment,KoppalTaluk,KoppalDistrict,Karnataka”,SujalaSWs-LRIAtlasNo.8,ICAR–NBSS&LUP,RC,Bangalore.p.71

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Abstract

Theaverageannualrainfallof631mmintheIrakallagudasub-watershedasrecordedfromtheKoppalstationdata. 68%,15%and16%oftheannualrainfalloccursduringkharif,rabiandsummerseasonsrespectivelyandexhibitedahighertemporalvariability. Theevapotranspirationestimationtooldevelopedindicatesthatthewatershedwaterbalanceisindeficit.Thecropping&irrigationchoicesarenotappropriateandneedtobealteredtoshiftthedeficitwaterbalance. Theestimatedrunoffavailabletouseis39mmforanaverageannualrainfallof706mm(2009-2017).Theutilizablegroundwateris31mm(70%of44mmrechargeestimated).Thismeansthetotalavailablewaterresourcecombiningthesoilmoisturestoreforkharif&rabi(194mm)andutilizablerunoffplusrechargeis264(=194+39+31) Theaverageactualevapotranspirationestimatedinthewatershedbasedonthecurrentlanduseandirrigationpracticesforthekharifandrabiseasonsis513mm.Hencetheamountofwateruseforkharifandrabiseasonsmaybeestimatedas641mm(i.e.125%ofAET).Thisdemandforthetwoseasonsishigherby377mm,i.e.(641-264).TheAETinJune-Septmonthsisalmost72%ofrainfall.Hence,thereisslightlylessopportunitytoharvesttheexcesswaterthroughwatershedmanagementpracticesforutilizingduringrabiseason. ThetotalnumberofwellspresentinIrakallagudasub-watershedasperLRIdatais291Borewells.ThegroundwaterlevelshownaboveisfromthedataobtainedfromDept.ofMines&GeologyfortheneareststationHonnahunsi

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