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Archived on 20161130 and the name was change from i08_B118_CA_GroundwaterBasins to i08_B118_CA_GWaterBasins20161130. The dataset is a feature class showing the boundaries of 515 groundwater basins and subbasins as defined by the California Department of Water Resources (Bulletin 118, 2003). The file is in ESRI geodatabase format and is intended for use with compatible GIS software. Groundwater basins are represented as polygon features and designated on the basis of geological and hydrological conditions - usually the occurrence of alluvial or unconsolidated deposits. When practical, large basins are also subdivided by political boundaries, as in the Central Valley. Basins are named and numbered per the convention of the Department of Water Resources. The associated data are considered DWR enterprise GIS data, which meet all appropriate requirements of the DWR GIS Spatial Data Standards. DWR makes no warranties or guarantees, either expressed or implied, as to the completeness, accuracy or correctness of the data, nor accepts or assumes any liability arising from or for any incorrect, incomplete or misleading subject data. The official DWR GIS Data Steward for this dataset is Brett Wyckoff, who may be contacted at 916-651-9283, or at brett.wyckoff@water.ca.gov. Comments, problems, improvements, updates, or suggestions should be forwarded to the official GIS Data Steward as available and appropriate.

Table that can be joined to the i08_B118_CA_Groundwater Basins using the field Basin_Subbasin_Number to select only those basins that are designated to be critically overdrafted according to DWR Bulletin 118. In February 2019, DWR released the final 2018 Basin Boundary Modifications, which affected nine critically overdrafted basins. The modified basins subject to critical conditions of overdraft are shown on the Critically Overdrafted Basins Map and will be presented in the Bulletin 118 Update 2020. For the 2018 Basin Boundary Modifications, 10 modifications were completed that involved 9 of the 21 COD basins identified in Bulletin 118-2016. Eight (8) of the 10 modifications were minor (relatively small areas being added to, or removed from, a basin) and COD designation was unchanged. Two (2) of the 10 modifications were major (relatively large areas being added to, or removed from, a basin) and COD designation required evaluation for Paso Robles subbasin and Los Osos basin. The 2018 list of 21 COD basins is the same as the 2016 list, with one minor exception (new Los Osos Valley – Los Osos Area subbasin). See https://water.ca.gov/Programs/Groundwater-Management/Bulletin-118/Critically-Overdrafted-Basins for more information.

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