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Developed exclusively for Central Valley Flood Protection Plan (CVFPP) work. Specifically, this area has been delineated in an effort to define the analysis area for environmental analyses of various kinds. Once finalized, a two-mile buffer will be added and form the basis of the potential environmental impacts delineation for CEQA work. Systemwide Planning Area includes lands subject to flooding under the current facilities and operation of the Sacramento-San Joaquin River Flood Management System CWC§ 9611, CWC§ 9641(d, e) (completely contains the State Plan of Flood Control (SPFC) Planning Area). The CVFPP describes facilities and flood management problems in this area and proposes solutions, while not extending the State's responsibility (CWC§ 9603(b)). This feature class represents the Systemwide Planning Area. It is one of the three CVFPP Planning Areas. It is comprised of the following layers:
1. LFPZ's developed by DWR as a first estimate of areas potentially inundated due to SPFC levee failure. There are no frequencies associated with these areas. LeveeFloodProtectionZone_20100301 (DWR)
2. Comprehensive Study 500 year floodplain delineation (CS_FP_500YR_Dissolve.shp) (DWR)
3. 200 year floodplain developed by DWR for the reaches of the Sacramento River upstream of Woodson Bridge which was the limit of the floodplain development for the Comprehensive Study. DWR_FloodPlain_200YR (DWR)
4. American River Economic Reevaluation Report (ARERR) 500 Year Floodplain.
5. A 50ft buffer of streams defining the hydrologic connections between multi-purpose or dedicated flood control reservoirs within the WPA.
6. Added the multipurpose/Flood Control Reservoirs (MultipurposeReservoirs_20100902.shp)
7. If Hydrologic features (Rivers, Channels, bypasses, etc) have SPFC Project levees on BOTH sides of the features… Include areas between two levees.
8. If Hydrologic features (Rivers, Channels, bypasses, etc) have SPFC Project levees on ONE sides of the features… Include areas from centerline of the feature to the levees.
9. Middle Creek, Adin, and North Fork Feather River project have been added.
10. HEC-FDA Impact Areas (the latest version developed with no holes/overlaps) were added as a way of filling in and smoothing the ragged boundaries of the Comprehensive Study 500yr Floodplain.
11. Data holes were filled using an automated process and supplemented by visual inspection and manual additions/subtractions.
12. Added USACE (Sacramento Office - SPK) provided protection areas that intersected the existing SPA except those outside of the Sacramento and San Joaquin Hydrologic Regions (as defined by CA DWR CalWater 2.2).