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PreparedincooperationwiththeU.S.DepartmentofEnergyMODFLOW-2000,THEU.S.GEOLOGICALSURVEYMODULARGROUND-WATERMODEL—DOCUMENTATIONOFTHEHYDROGEOLOGIC-UNITFLOW(HUF)PACKAGEOpen-FileReport00-342DefineHydrogeologicUnitsDiscretizeHydrogeologicUnitsforHUFColumn1234567891011121314ExplanationCoarse-SandUnitSiltUnitFine-SandUnitC2HUFImposesModelGridColumn123456789101112131412rey3aLledo4M5U.S.DepartmentoftheInteriorU.S.GeologicalSurveyMODFLOW-2000,THEU.S.GEOLOGICALSURVEYMODULARGROUND-WATERMODEL–DOCUMENTATIONOFTHEHYDROGEOLOGIC-UNITFLOW(HUF)PACKAGEByEVANR.ANDERMAN1andMARYC.HILL2U.S.GEOLOGICALSURVEYOpen-FileReport00-342PreparedincooperationwiththeU.S.DepartmentofEnergyDenver,Colorado20001CalibraConsultingLLC,Denver,CO2U.S.GeologicalSurvey,Boulder,COU.S.DEPARTMENTOFTHEINTERIORBRUCEBABBITT,SecretaryU.S.GEOLOGIC