5
  Ground Water Resources In Maharashtra  Physiography & Drainage  Climate & Rainfall  Hydrogeology  Ground Water Resource Availability  Maharashtra State has a geographical area of 3,07,713 sq. km and is bounded by North latitude 15°40’ and 22°00’ and East Longitudes 72°30’ and 80°30’. Administratively, the State has six divisions with Headquarters at Konkan (New Bombay), Pune, Nasik, Aurangabad, Amravati and Nagpur. The State has further been divided into four socio-economic regions namely Konkan comprising of Konkan sub-division, Madhya Maharashtra comprising of Nasik and Pune sub-divisions, Marathwada comprising of Aurangabad sub-d ivision and Vidarbha comprising of Amravati and Nagpur sub-d ivisions. The Stat e has 35 distri cts and 353 talukas. The State has two urban districts i.e. Mumbai and Mumbai Sub-Urban whereas the remaining 33 districts are rural. There are 336 cities and towns in the State, out of which 40 have population more than one lakh. There are 40,785 villages and 45,528 hamlets. The population of the State is 96.7 million as per 2001 Census out of which 41 million is urban and 55.7 million rural. Out of total area of the State, 73 %, i.e., 2.25 lakh, sq. km of area is cultivable and 17.6 % is under forest. The State has been divided into 1531 watersheds, which have been again sub-divided into 2405 sub-units, which form the assessment unit for the estimation of ground water resources. Physiography & Drainage Top  Physiography:-  Physiographically, the State can be divided into three units viz; a) The Sahya dri Range (Western Ghats), b ) The Western Coastal Tract (Konkan), c) The Eastern Plateau (Deccan Plateau). The Western Ghats is mountainous tract with western escarpment face and the eastern denudational slopes. The Sahyadris extends north to south and form the main drainage divide and have elevations ranging between 600 m. and 1600 m. above mean sea level. The Konkan coastal tract runs almost 500 km north to south with a width varying between 30 and 100 km and the eleva tion ranging up to 350 m abov e mea n sea level. The Deccan Platea u occupies the rest of the Sta te. The plateau can be subdivided into a number of well-marked elevations/ridges (interfluves) and broader lower elevation valley portions. DRAINAGE: - About 75% ar ea of Maharashtra is drained by eastward flowing rivers, viz. the Godavari and Krishna, to the Bay of Bengal and the remaining 25% area is drained by westward flowing rivers like the Narmada, Tapi and Konkan coastal rivers to the Arabian Sea. The broad physiographic features of the major basins of Maharashtra are described in Table-1.  Table – 1: Physiographic Features in Major Basins of Maharashtra State  SR.NO. BASI N NAME  GEOGRAPH-ICAL AREA (Sq. Km) % OF TOTAL AREA  PROMINENT DRAINAGE & HILLS AREAS DRAINED 1 GODAVARI 1,51,094 49.55 Easterly flowing Godavari with Penganga, Wainganga Wardha and Indravati as major tributaries Ajanta hill range and Plateau with Elevation 450-900 m amsl Nasik and northern part of Ahmednagar districts and all districts of Marathwada and Vidarbha. 2 KRISHNA 69,420 22.76 Easterly flowing Krishna river with Bhima, Sina,Man, Nira, Koyna, Warna, Panchganga and Ghatprabha prominent tributaries. Western Ghat i.e East phase of Sahyadri 600-1600 m amsl Satara, Kolhapur, Sangli, Solapur Pune and Sourthern part of Ahmedn agar districts. 3 TAPI-PURNA 51,250 16.80 Tapi west flowing river with Purna, Chandrabhaga, Girna, Murna Aner and Vaghur prominent tributaries. Satpura hill range 450-1000 mamsl Parts of Amravati, Akola, Buldhana, Jalgaon and Dhule districts. 4 COASTAL BASIN 31,650 10.38 Pinjal, Vaitarna, Bhatsai, Ulhas, Amba, Kundalika, Savitri, Vashishti, Shashtri and Keijvi etc. are prominent drainage. Draining to west coast Sahyadri hill range, Elevation 300-1600 m amsl Bombay, Thane, Raigarh, Ratnagiri & Sindhdurg districts. 5 NARMADA 1540 0. 51 West Narmada Part of Dhule district.  Climate & Rainfall Top  Climate:-The climate of the State is tropical. The Western Ghats hill ranges run north to south separating the coastal districts of Thane, Mumbai, Raigarh, Ratnagiri and Sindhudur g from rest of the State . The average height of these ranges is about 1000 m amsl form an important climatic divide. The coastal areas receive very high monsoon rains while to the east of the Ghats rainfall drops drastically within short distance from the Ghats. Towards further east, the rainfall once again gradually increases.  The State experiences four seasons during a year. March to May is the summer season followed by rainy season from June to September. The post monsoon season is October and November. December to February is the winter season. The State comprises of four meteorological sub-divisions namely Konkan, Madhya Maharashtra, Marathwada and Vidarbha.  Rainfall:- The State experiences extremes of rainfall ranging from 6000 mm over the Ghats to less than 500 mm in Madhya Maharashtra. The Konkan sub-division comprisin g of coastal distric ts and Western Ghats receive the heaviest rains, the Ghats receive more than 6000 mm and the plains 2500 mm.  Rainfall decreases rapidly towards eastern slopes and plateau areas where it is minimum (less than 500 mm). It again increases towards east i.e in the direction of Marathwada and Vidarbha and attains a second maximum of 1500 mm in the eastern parts of Vidarbha. Thus, the Madhya Maharashtra sub-division is the region of the lowest rainfall in the State.  The State receives its rainfall chiefly during the south west monsoon season (June to September) while Konkan receives almost 94% of the annual rainfall during the monsoon season, The other sub-divisions namely Mahdya Maharashtra, Marathwada and Vidarbha receive 83%, 83% and 87% respectively during this season.  The number of rainy days have great significance in artificial recharge to ground water. These vary from 75 to 85 in Konkan and 30 to 40 days in Madhya Maharashtra and Marathwada. The number of rainy days in Vidarbha is around 40 to 50 days during south west monsoon season (Table 2).  The intensity of rainfall plays a vital role in artificial recharge to ground water. Though as such, not much data is available, the maximum rainfall recorded in 24 hrs in some selected stations have been presented in Table 2. In general, the intensity of rainfall is high in coastal and Ghat areas as compared to the other parts of the state. The intensity of rainfall varies from storm to storm and with occurrence of depression and low-pressure areas during monsoon season.  

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    GroundWaterResourcesInMaharashtra Physiography&Drainage

    Climate&Rainfall

    Hydrogeology

    GroundWaterResourceAvailability

    Maharashtra State has a geographical area of 3,07,713 sq. km and is bounded by North latitude 1540 and 2200 and East Longitudes 7230 and 8030.Administratively,theStatehassixdivisionswithHeadquartersatKonkan(NewBombay),Pune,Nasik,Aurangabad,AmravatiandNagpur.TheStatehasfurtherbeendivided into four socioeconomic regions namely Konkan comprising of Konkan subdivision, Madhya Maharashtra comprising of Nasik and Pune subdivisions,MarathwadacomprisingofAurangabadsubdivisionandVidarbhacomprisingofAmravatiandNagpursubdivisions.TheStatehas35districtsand353talukas.TheStatehastwourbandistricts i.e.MumbaiandMumbaiSubUrbanwhereastheremaining33districtsare rural.Thereare336citiesand towns in theState,outofwhich40havepopulationmorethanonelakh.Thereare40,785villagesand45,528hamlets.

    ThepopulationoftheStateis96.7millionasper2001Censusoutofwhich41millionisurbanand55.7millionrural.OutoftotalareaoftheState,73%,i.e.,2.25lakh,sq.kmofareaiscultivableand17.6%isunderforest.

    TheState has beendivided into 1531watersheds,which have been again subdivided into 2405 subunits,which form the assessment unit for the estimation ofgroundwaterresources.

    Physiography&Drainage Top

    Physiography:

    Physiographically, theStatecanbedivided into threeunitsviz a)TheSahyadriRange(WesternGhats),b)TheWesternCoastalTract (Konkan), c)TheEasternPlateau(DeccanPlateau).

    TheWesternGhatsismountainoustractwithwesternescarpmentfaceandtheeasterndenudationalslopes.TheSahyadrisextendsnorthtosouthandformthemaindrainagedivideandhaveelevationsrangingbetween600m.and1600m.abovemeansealevel.TheKonkancoastaltractrunsalmost500kmnorthtosouthwithawidthvaryingbetween30and100kmandtheelevationrangingupto350mabovemeansealevel.TheDeccanPlateauoccupiestherestoftheState.Theplateaucanbesubdividedintoanumberofwellmarkedelevations/ridges(interfluves)andbroaderlowerelevationvalleyportions.

    DRAINAGE:About75%areaofMaharashtraisdrainedbyeastwardflowingrivers,viz.theGodavariandKrishna,totheBayofBengalandtheremaining25%areaisdrainedbywestwardflowingriversliketheNarmada,TapiandKonkancoastalriverstotheArabianSea.ThebroadphysiographicfeaturesofthemajorbasinsofMaharashtraaredescribedinTable1.

    Table1:PhysiographicFeaturesinMajorBasinsofMaharashtraState

    SR.NO. BASINNAME GEOGRAPHICALAREA(Sq.Km)%OFTOTAL

    AREA PROMINENTDRAINAGE&HILLS AREASDRAINED

    1 GODAVARI 1,51,094 49.55EasterlyflowingGodavariwithPenganga,WaingangaWardhaandIndravatiasmajortributariesAjantahillrangeandPlateauwithElevation450900mamsl

    NasikandnorthernpartofAhmednagardistrictsandalldistrictsofMarathwadaandVidarbha.

    2 KRISHNA 69,420 22.76EasterlyflowingKrishnariverwithBhima,Sina,Man,Nira,Koyna,Warna,PanchgangaandGhatprabha

    prominenttributaries.WesternGhati.eEastphaseofSahyadri6001600mamsl

    Satara,Kolhapur,Sangli,SolapurPuneandSourthernpartofAhmednagardistricts.

    3 TAPIPURNA 51,250 16.80TapiwestflowingriverwithPurna,Chandrabhaga,Girna,MurnaAnerandVaghurprominenttributaries.

    Satpurahillrange4501000mamsl

    PartsofAmravati,Akola,Buldhana,JalgaonandDhuledistricts.

    4 COASTALBASIN 31,650 10.38Pinjal,Vaitarna,Bhatsai,Ulhas,Amba,Kundalika,

    Savitri,Vashishti,ShashtriandKeijvietc.areprominentdrainage.DrainingtowestcoastSahyadri

    hillrange,Elevation3001600mamsl

    Bombay,Thane,Raigarh,Ratnagiri&Sindhdurgdistricts.

    5 NARMADA 1540 0.51 WestNarmada PartofDhuledistrict.

    Climate&Rainfall Top

    Climate:TheclimateoftheStateistropical.TheWesternGhatshillrangesrunnorthtosouthseparatingthecoastaldistrictsofThane,Mumbai,Raigarh,RatnagiriandSindhudurgfromrestoftheState.Theaverageheightoftheserangesisabout1000mamslformanimportantclimaticdivide.Thecoastalareasreceiveveryhighmonsoon rains while to the east of the Ghats rainfall drops drastically within short distance from the Ghats. Towards further east, the rainfall once againgraduallyincreases.

    TheStateexperiencesfourseasonsduringayear.MarchtoMayisthesummerseasonfollowedbyrainyseasonfromJunetoSeptember.ThepostmonsoonseasonisOctoberandNovember.DecembertoFebruary isthewinterseason.TheStatecomprisesoffourmeteorologicalsubdivisionsnamelyKonkan,MadhyaMaharashtra,MarathwadaandVidarbha.

    Rainfall:TheStateexperiencesextremesofrainfallrangingfrom6000mmovertheGhatsto lessthan500mminMadhyaMaharashtra.TheKonkansubdivisioncomprisingofcoastaldistrictsandWesternGhatsreceivetheheaviestrains,theGhatsreceivemorethan6000mmandtheplains2500mm.

    Rainfalldecreasesrapidlytowardseasternslopesandplateauareaswhereitisminimum(lessthan500mm).Itagainincreasestowardseasti.einthedirectionofMarathwadaandVidarbhaandattainsasecondmaximumof1500mmintheeasternpartsofVidarbha.Thus,theMadhyaMaharashtrasubdivisionistheregionofthelowestrainfallintheState.

    TheStatereceivesitsrainfallchieflyduringthesouthwestmonsoonseason(JunetoSeptember)whileKonkanreceivesalmost94%oftheannualrainfallduringthemonsoonseason,TheothersubdivisionsnamelyMahdyaMaharashtra,MarathwadaandVidarbhareceive83%,83%and87%respectivelyduringthisseason. The number of rainy days have great significance in artificial recharge to ground water. These vary from 75 to 85 in Konkan and 30 to 40 days in MadhyaMaharashtraandMarathwada.ThenumberofrainydaysinVidarbhaisaround40to50daysduringsouthwestmonsoonseason(Table2).

    Theintensityofrainfallplaysavitalroleinartificialrechargetogroundwater.Thoughassuch,notmuchdataisavailable,themaximumrainfallrecordedin24hrsinsomeselectedstationshavebeenpresentedinTable2.Ingeneral,theintensityofrainfallishighincoastalandGhatareasascomparedtotheotherpartsofthestate.Theintensityofrainfallvariesfromstormtostormandwithoccurrenceofdepressionandlowpressureareasduringmonsoonseason.

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    Thevariabilityofannualrainfalloverthestateingeneral,ishigh.Onlyinthecoastalareas,thevariabilityislessthan20%otherwisethevariabilityrangesbetween20%and35%overthestate.Onsubdivisionalbasis,thevariabilityofannualrainfallinKonkanistheleast(23%)whileitisthemaximuminMarathwada(31%).InMadhyaMaharashtraandVidarbhathevariabilityis30%and26%respectively.

    ThestudyofdroughtsshowsthatKonkanexperiencesonedroughtineveryeightyearswhileMarathwadaandMadhyaMaharashtra,thefrequencyisonedroughtineveryfiveyears.InVidarbha,itisonedroughtineverysixyears.SomeimportanthydrometeorologicalparametersarepresentedinTable2. Table2:Hydrometeorologicalparameters

    SR.NO. STATION AVERAGEMONSOONRAINFALL(mm)NO.OF

    RAINYDAYSMAX.RAINFALLIN

    24hrs.COEFFICIENTOF

    VARIATIONOFRAINFALL(%)

    AVERAGEEVAPORATION(mm)

    (Oct.toFeb) MarchtoMay1 Dahanu 1808 65 481 30 2 Bombay(clh) 1393 67 548 27 3.7 5.43 Alibag 1804 73 408 25 4.6 6.34 Ratnagiri 2436 73 356 22 5 Harnai 2315 84 212 23 6 Dhule 516 30 152 32 5.9 14.37 Jalgaon 691 41 183 24 6.7 14.08 Nasik 660 41 175 30 5.9 12.79 Malegaon 441 27 159 28 10 Ahmednagar 475 27 177 33 11 Pune 503 36 178 25 5.2 10.312 Solapur 516 31 191 30 7.0 12.813 Satara 827 53 184 26 14 Sangli 359 32 300 31 15 Kolhapur 759 55 198 24 16 Aurangabad 601 37 245 27 17 Beed 553 31 192 32 18 Nanded 779 42 254 31 19 Osmanabad 669 41 247 25 20 Parbhani 705 40 401 38 5.3 11.821 Chandrapur 1111 52 254 24 22 Bhandara 1224 53 307 23 23 Wardha 975 47 241 23 24 Nagpur 1069 50 315 23 4.4 10.025 Akola 685 37 365 25 6.0 15.426 Amravati 742 40 235 28 27 Buldhana 437 42 338 23 28 Yavatmal 925 45 338 23

    DROUGHTS:Maharashtrafrequentlyexperiencesdroughtconditionslikeotherpartsofthecountry,whichaffectsagriculturalproductionandeconomy.Longtermrainfall data between1901 and1990 from90 rain gauge stations of theStatewere used to compute normal rainfall and the negative departures of the yearlyrainfallfromthenormaltostudytherecurrenceofdroughtandtodemarcatedroughtproneareaoftheState.

    Adroughtyearisdefinedasayearinwhichthetotalrainfallreceivedislessthan75%ofthenormal.Theseverityofdroughtisaccordinglyclassifiedasfollows:

    S.No Category Range

    1 Moderate Rainfalldeparturebetween25%and49%

    2 Severe Rainfalldeparturebetween50%and74%

    3 Acute Rainfalldeparturebeyond74%

    If inanarea,droughtconditionsareexperienced for20%ormoreyears, then thearea isclassifiedasdroughtareaand if the frequency is40%orabove,theareaistermedchronicallydroughtprone.

    DroughtstudiesshowthatsomeoftheareasoftheState,wheredroughthasoccurredformorethan20%oftheyears,canbedemarcatedas"droughtarea'. It is observed that there are three distinct areas, which can be classified as drought areas. The first covers extreme northwestern part of the StatecomprisingpartsofNandurbar,Dhule,NasikandThanedistricts.ThesecondoneisinthenorthernpartoftheStatecoveringpartsofAkola,Amravati,WardhaandYavatmaldistricts.Thethirdandthelargestarea,coversalmostentirecentralpartoftheStatecomprisingmajorportionofMarathwadaandMadhyaMaharashtracovering parts of Ahmednagar, Pune, Solapur, Sangli, Satara and Kolhapur districts of Madhya Maharashtra and parts of Aurangabad, Jalna, Beed, Parbhani,Hingloi,NandedandOsmanabaddistrictsofMarathwada.

    The study of droughts shows that Konkan experiences one drought in every eight years while in Marathwada and Madhya Maharashtra, the frequency is onedroughtineveryfiveyears.InVidarbha,itisonedroughtineverysixyears.

    EVAPORATION:Theevaporationlossesduringthepostmonsoonperiod,i.e.,OctobertoFebruaryandduringsummer,i.e.,MarchtoMayareimportantfactortodesignartificialrechargestructuresandforassessingrechargetogroundwater.Theaverageevaporationratehasbeenpresented inTable2forthesestationswhereaclass'A'panevaporimeterexist.

    TheevaporationrateislowestincoastalbeltbothduringOctobertoFebruary(3.7to4.6mm/day)andMarchtoMay(5.4to6.3mm/day). It ishighest inVidarbhaandKhandesh(i.e.,Jalgaon,DhuleDistricts)regionswithanaverageevaporationrateupto15.4mm/dayduringMarchtoMay.Itisalsoobservedthattheevaporationduringsummer(MarchMay)shootsuptobymorethan200%ascomparedtopostmonsoonandwinterperiodaverage.

    TheevaporationrateislowestincoastalbeltbothduringOctobertoFebruary(3.7to4.6mm/day)andMarchtoMay(5.4to6.3mm/day).ItishighestinVidarbhaand Khandesh (i.e. Jalgaon, Dhule Districts) regions with an average evaporation rate up to 15.4 mm/day during March to May. It is also observed that theevaporationduringsummer(MarchMay)shootsuptobymorethan200%ascomparedtopostmonsoonandwinterperiodaverage.

    Hydrogeology Top

    Thegeological formation in the State ranges in age from Archean to Recent, and themajor part of the State is underlain by the Deccan basalts of Eocene toCretaceousagethatoccuroveranareaof2,49,934km2(81.2%ofthegeographicalareaofState).ItisfoundinallthedistrictsoftheStateexceptBhandaraandGadchiroli.OthermajorgeologicalformationsareArchaeansoccurringover32,235km2(10.5%),Precambrian(Purana)formationsoccurringover6217km2(2%),Gondwanasover4800km2(1.6%)andAlluviumover14,526km2(4.7%).Thevariousformationsaregroupedunderthreemajorhydrogeologicalgroups,suchas(1)unconsolidated,(2)semiconsolodated,and(3)consolidated,andninedifferenttypesofhydrogeologicalsubgroups,whicharedescribedasunder.ThedistributioninofhydrogeologicalunitinMaharashtraandtheirhydrogeologicalcharcteraregiveninTable3.Fig.1.depictsthehydrogeologyofMaharashtra.

    Table3:DistributionofHydrogeologicalUnitsinMaharashtraandtheirGroundWaterPotential

    GEOLOGICALAGE STRATIGRAPHICUNIT ROCKFORMATION DISTRICTS&HYDROGEOLOGICALCHARACTERSCONSOLIDATEDFORMATIONS

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    UPPERCRETACEOUSTOEOCENE

    DECCANTRAPS Basalt,DoleriteandotheracidicderivativesofBasalticMagma.

    OccursinallthedistrictsexceptinGadchiroliandBhandara.FracturedandVesicularlayersareproductive.Yieldofdugwellsvariesfrom5toeven725m3/day.

    PRECAMBRIANSEDIMENTARIES

    VINDHYANSCUDDAPAHSKALADGHIS

    Sandstone,Limestone,Shale,andConglomerates

    OccursinRatnagiri,Chandrapur,Yavatmal,Gadchiroli,Sindhudurg,Wardhadistricts.Aquiferbecomesproductivebyfracturesandsolutioncavities.Yieldofdugwellsrangesfrom27to240

    m3/dayduringwinterandfrom13to27m3/dayduringsummer.

    ARCHAEANSDHARWAD,

    IRONORESERIES,SAUSERSERIES,

    ARCHAEANCOMPLEX

    Quartzite,BandedHematitequartzite,Schist,Phyllite,Marble,

    Gneisse,Gondites,IntrusiveGranitesandDolerite.

    OccursinRatnagiri,Sindhudurg,Bhandara,Gadchiroli,Chandrapur,NagpurandNandeddistricts.Groundwaterintheseaquifersarecontrolledbydegreeofweathering,fracturingandjointing.Yieldofdugwellstappingtheseaquiferrangesfrom70to80m3/dayduringwinter

    andinbetween10and33m3/dayduringsummer.

    SEMICONSOLIDATEDFORMATIONSTERTIARY COASTALSEDIMENTARIES,LATERITE

    Sandstone,LignitebearingShaleandLaterite.

    OccursinRatnagiri,SindhudurgandKolhapurdistricts.Thisformsadistincthydrogeologicalunitandyieldsgooddischargetodugwells.

    CRETACEOUSINFRATRAPPEAN

    BAGHBEDSLAMETAS

    Sandstone,LimestoneandClays. OccursinDhule,Nagpur,Amravatidistricts.Theoccurrenceislessinnatureandhencethehydrogeologicalcharactershavenotbeenrecorded.

    UPPERCARBONIFEROUSTOJURASSIC GONDWANAS

    Sandstone,Conglomerates,Grits,Clays,Shale,Coalbeds,pebble

    boulderbeds.

    OccursinGadchiroli,Amravati,Chandrapur,Nagpur,Yavatmaldistricts.Theseformationshavegoodprimaryporosityandformmoderatetogoodaquifers.Theyieldvariesfrom150

    300m3/day.UNCONSOLIDATEDFORMATIONS

    PLEISTOCENE BEACHDEPOSITS(COASTALBEACHSANDS)Sands,Sandrockand

    Conglomerate.OccursinThane,Raigarh,RatnagiriandSindhudurgallalongthekonkancoast.Theyieldofthe

    wellsduringsummerrangesfrom20to230m3/day.

    RECENTTOSUBRECENT

    RIVERALLUVIUM(OTHERRIVERS)

    Silts,Clays,Sands,Gravelandoccasionallycobblebeds.

    OccursinThane,Ratnagiri,Sindhudurg,Jalgaon,Dhule,Nasik,Ahmadnagar,Satara,Sangli,Kolhapur,Jalna,Parbhani,Beed,Latur,Buldhana,Akola,Amravati,Wardha,Nagpur,Chandrapur,Gadchiroli.Theyieldofthedugwellsrangesfrom13to56m3/day.

    TERTIARYTORECENT RIVERALLUVIUM(PURNATAPI)ClaysandSiltswithlensesofsand,gravelandboulders.

    OccursinAmravati,Akola,Buldhana,JalgaonandDhuledistricts.TheolderAlluviumi.e.below80misnotproductive.TheyieldofdugwellstappingyoungerAlluviumrangesfrom100to

    500m3/day.

    GroundWaterResourceAvailability Top

    Theestimationofdynamicgroundwater resourcesofMaharashtrahas beendone for the year 20072008byGroundWaterSurveys andDevelopmentAgency(GSDA)incollaborationwithCGWBaspertherecommendationsofGEC1997Methodology.Asperthenorms,watershedhasbeenconsideredastheunit fortheassessmentofgroundwaterresources.Eachwatershedhasagainbeensubdividedintothreesubunitsvizcommand,noncommandandpoorqualitysubunits.Thetotalnumberofwatersheds intheState is1531,whichhavebeensubdivided into2405assessmentsubunits(command855,noncommand 1497andpoorquality53).

    Ithasbeenestimated that theAnnual replenishablegroundwater resource in theStateofMaharashtra is3.5792millionhectaremetre (mham)and theNetannualgroundwateravailability is3.3913mham.The totalannualgrossgroundwaterdraft isestimated tobe1.6997mhamand theestimatedNetannualgroundwateravailabilityforfutureirrigationdevelopmentis1.5393mham.Thedistrictwisedetailsofgroundwaterresourcesarepresentedbelow.

    DistrictwiseDynamicGroundWaterResources(20072008)

    S.NO. DISTRICT

    ANNUALREPLENISHABLEGROUNDWATER

    RESOURCE(Ham)

    NATURALDISCHARGEDURINGNONMONSOONSEASON(Ham)

    NETANNUALGROUNDWATERAVAILABILITY

    (Ham)

    ANNUALGROUNDWATERDRAFT PROJECTEDDEMANDFORDOMESTICANDINDUSTRIAL

    USESFORNEXT25

    YEARS(Ham)

    GROUNDWATERAVAILABILITYFOR

    FUTUREIRRIGATION

    (Ham)IRRIGATION(Ham)DOMESTICANDINDUSTRIAL

    USES(Ham)

    TOTAL(Ham)

    1 Ahmednagar 192293 9641 182652 140938 4623 145561 9246 396352 Akola 47829 2391 45437 13236 1236 14472 2472 284943 Amravati 104727 5288 99440 76406 2971 79377 5942 248224 Aurangabad 127630 6807 120824 70131 3763 73893 7525 398605 Beed 141061 7294 133767 63778 4760 68538 9520 557426 Bhandara 54029 3117 50913 12150 1967 14117 3935 328617 Buldhana 95409 4891 90518 61120 3184 64304 6367 219608 chandrapur 109155 5632 103523 8754 6292 15046 12584 759179 Dhule 126147 7546 118601 56032 1790 57822 3575 5720410 Gadchiroli 137473 9251 128222 17064 2174 19238 4347 10464511 Gondia 61880 3708 58171 4821 6118 10939 12236 3623412 Hingoli 106428 5321 101106 36245 1763 38008 3526 5957213 Jalgaon 140716 7138 133578 90219 4713 94932 9426 3508414 Jalna 96845 4878 91967 44265 894 45159 1787 4502115 Kolhapur 82709 4135 78574 44540 1326 45867 2653 3005416 Latur 126059 6734 119326 91637 2065 93702 4130 2482517 Nagpur 111697 5652 106046 34360 6421 40780 12842 5383818 Nanded 146706 7342 139363 39181 2655 41836 5310 9221719 Nandurbar 78116 5127 72989 25755 2385 28140 4770 4007920 Nashik 221047 11062 209985 99298 3519 102816 7037 10309821 Osmanabad 121077 6110 114967 71853 1973 73825 3945 3724522 Parbhani 92307 4736 87571 28044 1346 29390 2673 5550823 Pune 173096 9185 163911 111650 7067 118717 14113 3876524 Raigad 59361 2998 56363 5438 2094 7532 4188 4468525 Ratnagiri 48909 2450 46459 4031 1219 5249 2438 3877226 Sangli 97278 4978 92300 65553 2803 68356 5605 2110027 Satara 112224 5686 106538 68650 4855 73505 9709 2355028 Sindhudurg 27628 1393 26235 5602 1826 7428 3651 1515629 Solapur 159591 8081 151510 113026 4937 117962 9873 30978

    30 Thane 69648 3509 66139 6341 1255 7596 2510 56033

    31 Wardha 106964 5680 101264 29810 3574 33383 7147 60764

    32 Washim 59146 2959 56187 18169 1854 20023 3709 32455

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    33 Yeotmal 144011 7210 136801 36446 5739 42186 11478 83137

    TOTAL 3579196 187930 3391266 1594543 105158 1699701 210270 1539310

    StageOfGroundWaterDevelopment

    Astheestimationofgroundwaterpotentialwasmadeseparately foreachsubareas inawatershed, theoverall stageofdevelopment for thedistrict/stateasawholecannotbespecifiedowingtothefactthatthestageofgroundwaterdevelopmentforeachwatershedhasalsobeenobtainedseparately forcommandandnoncommandareas.Theseunitsformseparateentityandcannotbemergedforawatershedtoassignthestageofgroundwaterdevelopmenttoit.ThisistheoneofthemajorchangesmadeintheGEC1997Methodology.However,subunitwisestageofdevelopmentisavailable.

    CategorisationOfAreas

    The units of assessment are categorised into four based on two criteria (a.) stage of groundwater development, and (b.) longterm trend of pre and postmonsoonwaterlevels.Longtermgroundwaterlevelsareconsideredforaperiodofrecent10years.Thesignificantrateofwaterleveldeclineisconsideredas10to20 cmper year depending on local hydrogeological conditions. Four categories are: (i)Safeareas which have groundwater potential for development (ii)SemiCritical areas where cautious groundwater development is recommended (iii) Critical areas and (iv) Overexploited areas where there should beintensive monitoring and evaluation. Future ground water development is to be discouraged and the needy cases are to be linked with water conservationmeasures.Themodifiedcriteriaforcategorisationofassessmentunits,aspertheR&DAdvisoryCommittee,areasfollows:

    CategorisationofWatershedsbasedonStageofDevelopmentandWaterLevelTrends.

    SR.No. STAGEOFDEVELOPMENTSIGNIFICANTWATERLEVELDECLINE

    CATEGORYPREMONSOON POSTMONSOON

    1 70to90to100%

    NO NO Tobereassessed

    YES/NO NO/YES OVEREXPLOITED

    YES YES OVEREXPLOITED

    Table5:DistrictwisedetailsofCategorisationofWatershedsinMaharashtra(20072008)

    SR.NO. DISTRICT

    TOTALNO.OFWATERSHEDS

    CATEGORISATIONOFASSESSMENTSUBUNITS

    SAFE SEMICRITICAL CRITICALOVER

    EXPLOITED OTHERS

    1 Ahmednagar 80 53 15 0 12 0

    2 Akola 38 36 1 0 0 1

    3 Amravati 63 45 8 0 7 3

    4 Aurangabad 52 47 4 1 0 0

    5 Beed 48 48 0 0 0 0

    6 Bhandara 25 24 1 0 0 07 Buldhana 57 43 11 0 3 08 chandrapur 58 58 0 0 0 09 Dhule 45 45 0 0 0 010 Gadchiroli 83 83 0 0 0 011 Gondia 33 33 0 0 0 012 Hingoli 23 23 0 0 0 013 Jalgaon 66 40 17 2 7 014 Jalna 52 47 5 0 0 015 Kolhapur 40 38 2 0 0 016 Latur 39 28 4 0 7 017 Nagpur 54 51 3 0 0 0

    18 Nanded 49 49 0 0 0 0

    19 Nandurbar 29 29 0 0 0 0

    20 Nashik 80 54 17 1 8 021 Osmanabad 41 36 5 0 0 022 Parbhani 33 33 0 0 0 023 Pune 71 47 16 0 8 024 Raigad 17 17 0 0 0 025 Ratnagiri 20 20 0 0 0 026 Sangli 38 29 4 0 5 027 Satara 50 41 8 0 1 028 Sindhudurg 11 11 0 0 0 0

    29 Solapur 64 51 6 0 7 030 Thane 34 34 0 0 0 031 Wardha 39 39 0 0 0 032 Washim 35 35 0 0 0 033 Yeotmal 64 64 0 0 0 0

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    TOTAL 1531 1331 127 3 66 4

    C:CommandareaNC:NonCommandPQ:PoorQuality