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Section 5 <br />given year. Although storm flows average approximately 33 percent of the total <br />Santa Ana River flows, they average a lower percentage of the total water that is <br />recharged. This is primarily because the magnitude of storm flow releases from <br />Prado IDam often greatly exceeds the percolation capacity of the recharge <br />facilities. Storm water that is not captured by OCWD flows into the ocean. <br />Greenville Banning Flood Control Channel <br />The Greenville-Banning Flood Control Channel is a regional flood control facility <br />owned and operated by the County of Orange. The flood control channel drains <br />approximately an 8 acre area. The drainage area is primarily within the Cities of <br />Santa Ana and Costa Mesa. The segment of the channel along the frontage of <br />Centennial Park and the Heritage Museum is approximately 12 feet in width with <br />a rip rock siding and a soft bottom. Downstream of the Heritage Museum the <br />channel transitions into a 12 foot by 12 foot reinforced concrete box channel, <br />Centennial Lake <br />Centennial Lake is an existing man-made lake in Centennial Park. The lake has <br />soft side walls an impermeable clay bottom. Presently, the lake is filled with <br />potable water supplies, The lake provides passive and active recreation such as <br />fishing and model boating, but not full contact swimming, <br />Orange County Groundwater Basin <br />The Orange County Groundwater Basin underlies central and northern Orange <br />County and is bordered by the Santa Ana Mountains to the east, the Pacific <br />Ocean to the west, the Newport-Ilnglewood Fault to the southwest and Coyote <br />Hills to the north. The groundwater basin is contiguous and directly connected <br />with the Central Basin of Los Angeles County to the northwest. Depending on <br />location, the fresh-water-bearing alluvial deposits beneath the coastal plain of <br />Orange County range in thickness from 500 feet to 2,000 feet. These alluvial <br />deposits consist primarily of unconsolidated stream channel, marine terrace, and <br />alluvial deposits of Pleistocene to Recent age. OCWD modeling of the Orange <br />County groundwater basin indicates that the basin can be managed effectively to <br />yield 460,000 to 490,000 acre feet per year (afy) without adversely affecting the <br />condition of the groundwater basin provided that sufficient recharge is available. <br />Groundwater Replenishment System <br />The water supply to the Centennial Park Injection Well Project would be <br />advanced treated recycled water from OCWD Groundwater Replenishment <br />System (GWRS). The GWRS is a joint water reclamation project with OCWD <br />and the Orange County Sanitation District (OCSD). The GWRS takes secondary <br />treated wastewater and through advance treatment treats the water to meet <br />Mid Basin Centennial Park j�l &&nkbProlect Final EIR 5-99 <br />