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A law passed in 2007, Water Code Section 9130, requires the Department of Water Resources (DWR) to prepare Levee Flood Protection Zone (LFPZ) maps by December 31, 2008; the maps shall, using the best available information, identify the areas where flood levels would be more than three feet deep if a project levee were to fail. DWR used information from several sources currently available, including FEMA floodplain maps, FEMA Q3 data, USACE's 2002 Sacramento and San Joaquin River Basins Comprehensive Study, and local project-levee studies. The law also states that DWR may periodically revise the maps to include updated information when that information becomes available. DWR is implementing an aggressive multi-year program to evaluate and delineate detailed floodplains for many of the areas protected by project levees. This effort includes new topography, hydrology, hydraulic models, and floodplain maps. This information will be used to update the initial LFPZ maps. Under Water Code section 9110(b), "Levee Flood Protection Zone" means the area, as determined by the Central Valley Flood Protection Board or DWR, that is protected by a project levee. DWR delineated the LFPZs by estimating the maximum area that may be flooded if a project levee fails with flows at maximum capacity that may reasonably be conveyed. The maps should not be confused with Federal Emergency Management Agency's Flood Insurance Rate Maps used for the National Flood Insurance Program. They were prepared for different purposes and do not show the same type of flood hazard.
This polygon dataset was created to define the areas protected by State Plan of Flood Control (SPFC) levees. DWR is required by law to mail out annual written notices to owners of properties located within the LFPZs. This dataset was created by various methods which are described in the Technical Memorandums developed by the consultants who helped DWR develop the dataset. |
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A law passed in 2007, Water Code Section 9130, requires the Department of Water Resources (DWR) to prepare Levee Flood Protection Zone (LFPZ) maps by December 31, 2008; the maps shall, using the best available information, identify the areas where flood levels would be more than three feet deep if a project levee were to fail. DWR used information from several sources currently available, including FEMA floodplain maps, FEMA Q3 data, USACE's 2002 Sacramento and San Joaquin River Basins Comprehensive Study, and local project-levee studies. The law also states that DWR may periodically revise the maps to include updated information when that information becomes available. DWR is implementing an aggressive multi-year program to evaluate and delineate detailed floodplains for many of the areas protected by project levees. This effort includes new topography, hydrology, hydraulic models, and floodplain maps. This information will be used to update the initial LFPZ maps. Under Water Code section 9110(b), "Levee Flood Protection Zone" means the area, as determined by the Central Valley Flood Protection Board or DWR, that is protected by a project levee. DWR delineated the LFPZs by estimating the maximum area that may be flooded if a project levee fails with flows at maximum capacity that may reasonably be conveyed. The maps should not be confused with Federal Emergency Management Agency's Flood Insurance Rate Maps used for the National Flood Insurance Program. They were prepared for different purposes and do not show the same type of flood hazard.
This polygon dataset was created to define the areas protected by State Plan of Flood Control (SPFC) levees. DWR is required by law to mail out annual written notices to owners of properties located within the LFPZs. This dataset was created by various methods which are described in the Technical Memorandums developed by the consultants who helped DWR develop the dataset. |
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California Department of Water Resources, with consulting services from HDR, RBF, CH2M-Hill, Wood Rodgers, and Atkins (formerly PBS&J). Adjustments made to the initial datasets made by the Flood Risk Assessment and Mitigation Office staff. |
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<div style="text-align:Left;"><div><div><p style="margin:7 0;">The Levee Flood Protection Zone (LFPZ) maps were developed by the State of California Department of Water Resources as required by Water Code Section 9130 to increase awareness of flood risks associated with State-Federal levees. The maps should not be confused with Federal Emergency Management Agency's Flood Insurance Rate Maps used for the National Flood Insurance Program. They are not showing the same type of flood hazard and they were prepared for different purposes. Levee Flood Protection Zone maps estimate the maximum area that may be flooded if a State-Federal levee fails with flows at maximum capacity that may reasonably be conveyed. These maps specifically focus on flood risks associated with State-Federal levees. Lands within the Levee Flood Protection Zone may also be subject to flooding due to other factors including, but not limited to, levee failure at flows less than design capacity, overtopping of a levee, drainage problems, or other types of flooding from sources on the land side of the levee. Lands not mapped within a Levee Flood Protection Zone may also be subject to flood risk.</p><p style="margin:7 0;"><span>This polygon dataset represents the areas protected by State Plan of Flood Control (SPFC) levees.</span></p><p> </p></div></div></div> |
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Levee Flood Protection Zones estimate the maximum area that may be inundated if a project levee fails when the water surface elevation is at the top of a project levee. Zones depicted in this dataset were created utilizing methods and assumptions described in the accompanying technical manual, and do not necessarily depict areas likely to be protected from flow events for which project levees were designed.
Lands within the Levee Flood Protection Zones may be subject to flooding due to various factors, including the failure or overtopping of project or non-project levees, flows that exceed the design capacity of project or non-project levees, and flows from water sources not specifically protected against by project levees. Lands not mapped within a Levee Flood Protection Zone are not invulnerable to flood risk, and some may also experience flooding from these or other processes. The California Department of Water Resources (DWR) makes no warranties, representations or guarantees, either expressed or implied, as to the completeness, accuracy or correctness of the levee flood protection zone (LFPZ) data, nor accepts or assumes any liability arising from or for any incorrect, incomplete or misleading LFPZ data provided pursuant to this request. LFPZ data may change with time. The current version of the LFPZ data contains the best data that was available at the time of data collection. Users should be aware that newer and more accurate data may exist and may not be reflected in the current version of the LFPZ data., Private parties must formally request access to the LFPZ data by completing a LFPZ Data Request/ Release Agreement form. This form can be obtained by emailing lfpz@water.ca.gov. |
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LFPZ_2021_corrected_04-13-21 |
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["Levee Flood Protection Zones","LFPZ","Flood Risk Notification Program","FRN","Division of Flood Management","DFM","California Department of Water Resources","DWR"] |
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en-US |
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NaN |
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