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Land Resource and Hydrological Inventory of IndargiSub-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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regions
  • Northern Europe
  • Europe
  • World
  • Southern Asia
  • Asia
citation

RajendraHegde,K.V.Niranjana,S.Srinivas,B.A.Dhanorkar,R.S.ReddyandS.K.Singh(2019).“LandResourceandHydrologicalInventoryofIndargiSub-watershed(SWs)forWatershedPlanningandDevelopment,KoppalTaluk,KoppalDistrict,Karnataka”,SujalaSWs-LRIAtlasNo.7,ICAR–NBSS&LUP,RC,Bangalore.p.63

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Abstract

Theaverageannualrainfallof631mmintheIndargisub-watershedasrecordedfromtheKoppalstationdata. 65%,20%and15%oftheannualrainfalloccursduringKharif,RabiandSummerseasonsrespectivelyandexhibitedahighertemporalvariability. Theevapotranspirationestimationtooldevelopedindicatesthatthewatershedwaterbalanceisindeficit.Thecropping&irrigationchoicesarenotappropriateandneedtobealteredtoshiftthedeficitwaterbalance. Theestimatedrunoffavailabletouseis73mmforanaverageannualrainfallof596mm(2009-2017).Theutilizablegroundwateris31mm(70%of44mmrechargeestimated).Thismeansthetotalavailablewaterresourcecombiningthesoilmoisturestoreforkharif&rabi(178mm)andutilizablerunoffplusrechargeis282(=178+31+73) Theaverageactualevapotranspirationestimatedinthewatershedbasedonthecurrentlanduseandirrigationpracticesforthekharifandrabiseasonsis550mm.Hencetheamountofwateruseforkharifandrabiseasonsmaybeestimatedas687mm(i.e.125%ofAET).Thisdemandforthetwoseasonsishigherby405mm,i.e.(687-282).TheAETinJune-Septmonthsisonly47%ofrainfall.Hence,thereisagoodopportunitytoharvesttheexcesswaterthroughwatershedmanagementpracticesforutilizingduringrabiseason. Thetotalnumberofwellspresentinindargisub-watershedasperLRIdatais238(236-borewellsand2-openwell).ThegroundwaterlevelshownaboveisfromthedataobtainedfromDept.ofMines&GeologyfortheneareststationHonnahunsi

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