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Basin 8-1 Overview <br />3. SOUTH EAST MANAGEMENT AREA <br />The South East Management Area contains portions of Irvine Ranch Water District (IRWD), El <br />Toro Water District (ETWD), and the City of Orange. The area covered this management area <br />is essentially an extension of the main basin and was formed to comply with the requirement <br />that the entirety of Basin 8-1 be covered by a responsible agency. <br />There is relatively little existing, or potential, groundwater development within the South East <br />Management Area. What pumping does occur is less than 200 acre -feet -per -year (afy), which <br />is much less than the total recharge to the area. Water levels and storage levels are steady. <br />The Sustainability Goal for the South East Management Area is to recognize it is a small part of <br />the larger groundwater basin that is managed by OCWD. Nevertheless, groundwater levels and <br />water quality will be monitored to assure that conditions do not lead to significant and <br />unreasonable (1) lowering of groundwater levels, (2) reduction in storage, (3) water quality <br />degradation, (4) inelastic land subsidence, (5) unreasonable adverse effect on surface water <br />resources, and (6) adverse impacts on hydrologically connected surface water. <br />4. SANTA ANA CANYON MANAGEMENT AREA <br />The Santa Ana Canyon Management Area covers the easternmost extent of Basin 8-1. The <br />water resources in the Santa Ana Canyon Management Area include the Santa Ana River and <br />groundwater. Groundwater is primarily located in a thin alluvial aquifer that is 90 to 100 feet <br />thick and is a combination of infiltrated surface water and groundwater inflow from the adjacent <br />foothills. <br />Groundwater pumping in this management area is primarily used for irrigation with a minimal <br />amount used for potable purposes. The amount of groundwater pumping is small relative to the <br />large volumes of flow in the canyon provided by the Santa Ana River and monitoring indicates <br />there are no depletions of interconnected surface water that have significant and unreasonable <br />adverse impacts on beneficial uses of the surface water. There are no groundwater withdrawals <br />within the areas covered by the Cities of Anaheim, Chino Hills, and Yorba Linda; Riverside <br />County; and Yorba Linda Water District. <br />OCWD has water rights to all Santa Ana River flows released through Prado Dam. For the area <br />within its boundary, OCWD has the legal authority through the OCWD Act to require reporting of <br />groundwater production and to charge groundwater pumping assessments for groundwater <br />production. OCWD also monitors surface water flow and quality as well as groundwater levels <br />and quality throughout the Santa Ana Canyon Management Area. <br />The Sustainability Goal for the Santa Ana Canyon Management Area is to continue monitoring <br />sustainable conditions and monitor to ensure that no significant and unreasonable results occur <br />in the future. <br />2017 BASIN 8-1 ALTERNATIVE Overview 7 <br />