What is the difference between CalWater 2.0 and 2.2?
Version 1.2 was completed in 1995 by Tierra Data Systems (Jim Kellogg). Linework was captured by overlaying the Basin Plan Maps on 1:24,000-scale USGS quad sheets, redrawing and digitizing lines to match 1:24,000-scale watershed boundaries, and subdividing the 4th level Hydrologic Sub areas (HSAs) into 5th level Super Planning Watersheds (SPWS) and 6th level Planning Watersheds (PWS). Version 2.0 called for the removal of the 5th level Super Planning Watersheds and 6th level Planning Watersheds, introduction of the groundwater line around the Central and Salinas valleys, and was subject to an extensive cooperative planning and review effort by the California Interagency Watershed Mapping Committee (IWMC). CalWater version 2.2 is the third version of CalWater (after versions 1.2 and 2.0). CalWater 2.2 adds the 5th and 6th level watershed units back in, incorporates the State Water Resources Control Boards watershed system, and contains the crosswalk to the USGS system of hydrologic unit
