The Department of Water Resources subdivides the State into specific geographical study areas for planning purposes. The largest study areas are the ten hydrologic regions, corresponding to the State's major drainage basins. The next level of delineation is the planning area, which are composed of multiple detailed analysis units. The DAUs are often split by county, so the smallest study area used by the Department is the DAU/county. Many planning studies begin at the DAU or PA level, and the results are aggregated into hydrologic regions for presentation. The level of detail of the boundaries can be seen below:
State > Hydrologic Region (HR) > Planning Area (PA) > Detailed Analysis Unit (DAU) > Detatiled Analysis Unit by County (DAU by Co.)
Update 2005 also provides data and analysis for the two special study areas of Mountain Counties (MC) and the Sacramento-San Joaquin Delta (legal Delta).
.gif) |
Hydrologic Regions Map |
(.pdf, 219 KB) |
| |
 |
GIS Shape Files |
(.zip, 3.21 MB) |
|
Planning Area Map |
(.pdf, 468 KB) |
| |
|
GIS Shape Files |
(.zip, 5.65 MB) |
|
Detailed Analysis Unit Map |
(.pdf, 747 KB) |
| |
|
GIS Shape Files |
(.zip, 10.2 MB) |
|
County Map |
(.pdf, 397 KB) |
| |
|
GIS Shape Files |
(.zip, 6.11 MB) |
|
Special Study Areas-HR with Mountain Counties and legal Delta |
(.pdf, 284 KB) |
|
Wild and Scenic Rivers Map |
(.pdf, 3.13 MB) |
| |
|
GIS Shape Files |
coming soon |
| |
|
|
|
| 
