Final Report, 2010 Urban Water Management Plan - Culver City

6.1.2 Culver City System’s Water Supply ReliabilityTable 6-2 presents water supply projections for imported water sources during a normal year,single-dry year, and multiple-dry years for the Culver City System. The normal-year supplyrepresents the expected supply under average hydrologic conditions, the dry-year supplyrepresents the expected supply under the single driest hydrologic year, and the multiple-dryyear supply represents the expected supply during a period of three consecutive dry years.As described above, imported water supplies from Metropolitan are anticipated to be100 percent reliable and able to meet demands through 2035. Therefore, the imported watersupply projections for a normal water year, single-dry year, and multiple-dry years are taken asthe 2035 projection, which is equivalent to the imported water demand projected for 2035. It isassumed that the single-dry year and multiple-dry year supplies are the same as those for thenormal years because available supplies are sufficient to meet projected demands under allanticipated hydrologic conditionsTable 6-2:Supply Reliability for the Culver City System for Year 2035 in ac-ft/yrSourceNormal WaterYearMultiple-Dry Water YearsSingle-Dry WaterYear Year 1 Year 2 Year 3Imported waterfrom WBMWD6,975 6,975 6,975 6,975 6,975Groundwater 0 0 0 0 0Total 6,975 6,975 6,975 6,975 6,975Percent of Normal 100 100 100 100Notes:1. Table format based on DWR Guidebook Table 28.2. Groundwater APA pumping supply reliability does not include potential groundwater right leases.Table 6-3 lists single-dry year and multiple-dry year periods for imported water supplies. Thesingle-dry year and multiple-dry year periods are based on WBMWD’s analysis on the lowestaverage precipitation for a single year and the lowest average precipitation for a consecutivemultiple-year period, respectively. WBMWD’s estimates suggest that fiscal year (FY) 2009-10represents a normal water year based on average rainfall over the last 100 years. FY 2006-07represents the single-dry year, and the years of FY 2006-07, 2007-08, and 2008-09 representthe driest three consecutive years.Table 6-3:Basis of Water Year DataWater Year Type Base Year(s) Historical SequenceNormal Water Year (3) FY 2009-2010 1910 – 2010Single-Dry Water Year FY 2006-2007 1910 – 2010Multiple-Dry Water Years FY 2006-2009 1910 – 2010Notes:1. Analysis of precipitation data was provided by WBMWD.2. Table format based on DWR Guidebook Table 27.Page 6-4Final Report, 2010 Urban Water Management Plan – Culver CityGolden State Water Companyg:\adminasst\jobs\2010\1070001.00_gswc-uwmp\09-reports\9.09-reports\2011-08\grp3\gswc_culvercity_2010_uwmp-final.doc