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001348 Table 2-1. USGS Streamflow Gaging Station used in Natural Flow Development. Map Ref 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 USGS Gage 9342500 9343000 9343300 9344000 9344400 9345200 9346400 9349800 9353000 9354500 9355000 9355500 9361500 9362800 9363500 9364500 9365000 9365500 9366500 9367500 9368000 9371000 Description San Juan River At Pagosa Springs, CO Rio Blanco Near Pagosa Springs, CO Rio Blanco River Below Blanco Diversion Dam, CO Navajo River At Banded Peak Ranch, Near Chromo, CO Navajo River Below 050 Diversion Dam, Near Chromo, CO Little Navajo River Below Little Oso Diversion Dam, Near Chromo, CO San Juan River Near Carracas, CO Piedra River Near Arboles, CO Vallecito Reservoir Near Bayfield, CO Los Pinos River At La Boca, CO Spring Creek At La Boca, CO , Modified Sheet 0 San Juan River NeBr Archuleta, NM Animas River At Durango, CO Lemon Reservoir Near Durango, CO Animas River Near Cedar Hill, NM Animas River At Fannington, NM San Juan River At Fannington, NM La Plata River At Hesperus, CO La Plata River At Colorado-New Mexico State line, CO La Plata River Near Fannington, NM San Juan River At Shiprock, NM Mancos River Near Towaoc, CO . The NMISC' s determination that particular sections need to be segregated in response to certain current and anticipated water management issues, . Ariwna and Utah consist of one unit each. Diversions occur throughout the San Juan River Basin with a majority going towards irrigation depletions, Depletions were divided into irrigation and non-irrigation categories, Irrigation depletion includes net crop water use, incidental losses, sprinkler evaporation and ground water buildup. Incidental losses include canal evaporation and phreatophyte use from field runoff and canal seepage, Incidental losses were originally computed in the Type I Study (see later discussion), They were subsequently modified for use in Colorado River System Consumptive Uses and Losses Report (CRSCU&L). Acres of phreatophytes found in the 1993 GIS coverage are consistent with Type I and CRSCU&L, Incidental loss rates used in this analysis are CRSCU&L values by county. New Mexico's incidental loss rate of 10% for all units was provided by NMISC. Sprinkler evaporation and groundwater were only accounted for in newer projects. Typically, older districts irrigate through flood irrigation methods and are assumed to have minimal evaporation losses and given their age, their ground water losses have equalized, Non-irrigation categories include stock pond evaporation, livestock consumption, mining, municipal and industrial, thermal power, reservoir evaporation and fish and wildlife. Off-stream depletions were not provided their own source of water in this analysis. DRAFT - SJRIP Hydrology Model Documentation June 18, 1999 9