INTERSTATE INTERSTATE STREAM STREAM COMMISSION COMMISSION Understanding the Middle Valley Apportionment Under the Rio Grande Compact and Associated Challenges Kevin Flanigan New Mexico Interstate Stream Commission April 26, 2006
The Middle Rio Grande Basin in New Mexico
Water Supplies Available to Middle Valley • Native Rio Grande Inflow at Otowi • Tributary Inflow • Groundwater Storage • San Juan-Chama Project Water
INTERSTATE Otowi Gage INTERSTATE STREAM STREAM COMMISSION COMMISSION
Otowi Index Supply 3,000 2,750 2,500 2,250 2,000 Flow (af x 1000) 1,750 1,500 1,250 1,000 750 500 250 0 1940 1945 1950 1955 1960 1965 1970 1975 1980 1985 1990 1995 2000 2005 Year
INTERSTATE Rio Grande Compact INTERSTATE STREAM STREAM COMMISSION COMMISSION ANNUAL COMPACT ALLOCATION CHART 3000 2800 2600 ANNUAL COMPACT ALLOCATION (AF X 1,000 2400 In above average year flow in excess of 405,000 acre-feet must be passed below 2200 Elephant Butte Reservoir 2000 1800 1600 1400 1200 1000 New Mexico Delivery Obligation to Elephant Butte Reservoir 800 600 400 200 Available for Depletion in the Middle Valley 0 0 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 3000 OTOWI INDEX FLOW (AF X 1,000)
OTOWI INFLOW AVAILABLE FOR DEPLETION IN MIDDLE VALEY 450 400 350 300 ACRE-FEET X 1,000 250 200 150 100 50 0 9 1 3 5 7 9 1 3 5 7 9 1 3 5 7 9 1 3 5 7 9 1 3 5 7 9 1 3 5 4 5 5 5 5 5 6 6 6 6 6 7 7 7 7 7 8 8 8 8 8 9 9 9 9 9 0 0 0 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 2 2 YEAR
ACRE-FEET 100,000 150,000 200,000 250,000 300,000 50,000 0 1971 1972 1973 1974 1975 1976 SAN JUAN-CHAMA WATER AT OTOWI 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 YEAR 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 COMMISSION COMMISSION INTERSTATE INTERSTATE 2000 STREAM STREAM 2001 2002 2003 2004 2005
INTERSTATE INTERSTATE STREAM STREAM COMMISSION COMMISSION HISTORIC FATE OF SAN JUAN-CHAMA WATER IN THE MIDDLE VALLEY � MRGCD � Offset Municipal Pumping Effects on River � Leased by United States to Provide Supplemental Flows for Endangered Silvery Minnow � Routed to Storage in Elephant Butte Reservoir � Leased by Interstate Stream Commission for Jemez Canyon Reservoir Sediment Pool
INTERSTATE INTERSTATE Elephant Butte Dam and Reservoir STREAM STREAM COMMISSION COMMISSION
INTERSTATE INTERSTATE MRG River System Depletions STREAM STREAM COMMISSION COMMISSION Reservoir Evaporation Riparian 21% Total Mean River 37% Urban Depletions: approximately 5% (groundwater depletion 613,000 acre-feet per year with wastewater offset) 37% Crops Source: SSPA, July 2000 Water Supply Study of the Middle Rio Grande
INTERSTATE INTERSTATE Future Depletions with Compact Impacts STREAM STREAM COMMISSION COMMISSION � Supplemental Flow Requirements for Endangered Species � Habitat Restoration Activities � Delayed River Depletions from Historic and Current Groundwater Pumping � Increased Depletions Resulting from Growing Demand for Urban Growth and Economic Development � Increased Use of San Juan-Chama Project Water
State Efforts to Increase Available Supply
INTERSTATE INTERSTATE STREAM STREAM COMMISSION COMMISSION POSSIBLE KEYS TO THE PUZZLE • Priority Administration ? • Active Water Resource Management ? • Shortage Sharing and Consensus Plans ? • Innovative State-Federal Agreements – Conservation Water Agreement (2001) – Emergency Drought Water Agreement (2003)
INTERSTATE INTERSTATE STREAM STREAM COMMISSION COMMISSION POSSIBLE KEYS TO THE PUZZLE (CONTINUED) • Water Markets ? • Water Conservation ?
ACTUAL VS. REQUIRED DELIVERIES 400 350 300 ACTUAL DELIVERY (AF x 1,000) 250 200 150 100 50 0 0 50 100 150 200 250 300 350 400 REQUIRED DELIVERY (AF X 1,000)
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