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<br />Bulletin 160-98 Public Review Dreft <br /> <br />Chepter 1. fntroducffon <br /> <br />Figure 1-4 shows how the Department subdivides the State into regions for planning <br />purposes. The Department uses several levels of delineation, The largest is the hydrologic <br />region, a unit used extensively in this Bulletin, California has ten hydrologic regions, <br />corresponding to the State's major drainage basins. These regional boundaries are also used by <br />the State Water Resources Control Board, Each of SWRCB's nine Regional Water Quality <br />Control Boards covers one hydrologic region, (SWRCB combines the North and South <br />Lahontan regions into one region administered by the Lahontan RWQCB.) The next level of <br />delineation below hydrologic regions is the planning subarea, Some of the regional water <br />management plans in Chapters 7 through 9 discuss information at the PSA level. The smallest <br />study unit used by the Department is the detailed analysis unit, which is too small to show in <br />Figure 1-4, California is divided into 278 DADs. Many of the Departments' Bulletin 160 <br />calculations are performed at the DAD level, and the results are aggregated into hydrologic <br />regions, <br /> <br />1-12 <br /> <br />DRAFT <br />