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San Juan-Chama Water Accounting Albuquerque Area Office July 1998 The natural inflow into Heron Reservoir during the month of July was computed to be 154 acre-feet (AF) as shown in Table 3. There were 1367 AF net San Juan-Chama (SJ-C) losses, as shown in Table 2. There was 17580 AF diverted through Azotea Tunnel this month. There was a total of 164 AF of Natural (RG) released from Heron. There was ,a total of 9546 AF of SJ-C water released from Heron,all of which were delivered to the City of Albuquerque pool in Abiquiu. There was a total of 918 AF of SJ-C releases from EI Vado, all of which represented payback by the MRGCD to the City of Albuquerque Pool in Abiquiu. There was 11692 AF of SJ-C water released from Abiquiu, of which 5328 AF was borrowed from the City of Albuquerque pool by MRGCD. The remaining 6364 AF was released from the City of Albuquerque pool in support of Middle Rio Grande Valley water management. There was 2.37 inches of precipitation at Heron Reservoir, which is 136% of the July (running) average of 1. 74 inches. The monthly computations for Heron Reservoir are summarized in Tables 1-3. As in the months of May and June, Table 1 shows significant negative tributary inflows above Heron Reservoir. After discussing this issue with our Chama Office and examining their quality assurance procedures, we believe te measurements made at the Azotea Tunnel outlet and Lower Willow Creek gages are reasonable. Although the high negative values are physically meaningless, we are comfortable with the data measurement techniques being used. Total inflow into Nambe Falls Reservoir was computed to be 1061 AF. There were 2.7 AF of losses on the reservoir. Table 4 summarizes San Juan-Chama water at Otowi. Estimated sediment deposition in the San Juan-Chama pools at Abiquiuu and Jemez Canyon Reservoirs, and Cochiti Lake are presented in Tables 5A-5C. Storage and evaporation of Rio Grande water in EI Vado and Abiquiuu Reservoirs are shown in Table 6. All data are provisional and subject to revision as final data are collected and analyzed.