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Basin 8-1 Overview For the purpose of compliance with the SGMA requirement that the entire basin be covered by this Basin 8-1 Alternative, Submitting Agencies have divided Basin 8-1 into four management areas: La Habra -Brea, OCWD, South East, and Santa Ana Canyon Management Areas, shown in Figure 1-1. Historically, the majority of Basin 8-1 (90% of the land area) has been managed by OCWD, which includes the land area within the OCWD Management Area and a small portion of the land area within the Santa Ana Canyon Management Area. The percentage of the land area within Basin 8-1 in each of the management areas is shown in Figure 1-2. Although the land areas outside of OCWD's jurisdiction in the Santa Ana Canyon and South East Management Areas have not been formally "managed" by OCWD, the hydrogeological conditions in these areas are essentially an extension of the managed basin. OCWD has incorporated data, when available, from these areas into the OCWD data base. For example, precipitation runoff from the mountains along the eastern border (in the South East Management Area) is estimated and incorporated into OCWD's basin water budget. The Santa Ana Canyon Management Area, created in this report in order to include land within and outside of OCWD's service area, is upstream of OCWD recharge operations. While OCWD does not have jurisdiction over all the land in this area, OCWD does have the rights to all the water in the Santa Ana River released from Prado Dam. In this respect, OCWD is actively engaged in managing the flow of surface water within the Santa Ana Canyon irrespective of land ownership. While the four management areas are described separately in this report, it is important to understand that actual "management" is not as distinct, and existing collaborative efforts between agencies in managing groundwater resources will continue. In the case of the La Habra -Brea Management Area, the City of La Habra has already been deemed the exclusive GSA for the La Habra/Brea area and intends to prepare a Groundwater Sustainability Plan (GSP). When La Habra submits a GSP, this Basin 8-1 Alternative will no longer include the La Habra/Brea area within the area designated by the GSP. As authorized by 23 CCR § 354.20, this Basin 8-1 Alternative describes four management areas as shown in Figure 1. The rationale for designating these management areas within Basin 8-1 is explained as follows: • La Habra -Brea Management Area includes the northern portion of Basin 8-1 that is located outside of the OCWD service area and is within the cities of La Habra and Brea. The City of La Habra currently manages this portion of Basin 8-1. Although this management area is hydrologically distinct from the OCWD Management Area there is an estimated 1,000 afy of subsurface groundwater flow from the La Habra -Brea Management Area to the OCWD Management Area. Surface water that recharges the OCWD portion of Basin 8-1 does not replenish the La Habra -Brea Management Area. The OCWD Management Area includes approximately 89 percent of the land area of Basin 8-1. Ninety-eight percent of all groundwater production within 8-1 occurs in this management area. This area includes the portion of Basin 8-1 that is within OCWD's service area, except for an approximately 7-square mile portion of OCWD's service area 2017 BASIN 8-1 ALTERNATIVE Overview 2 55D-47