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A Brief Overview of the Rio Grande Compact 04/26/06 The New Mexico - - PowerPoint PPT Presentation
A Brief Overview of the Rio Grande Compact 04/26/06 The New Mexico - - PowerPoint PPT Presentation
A Brief Overview of the Rio Grande Compact 04/26/06 The New Mexico Interstate Stream Commission Investigate, Protect, Conserve, and Develop the States Waters and Stream Systems Negotiate and Administer Interstate Compacts Oversee
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The Upper Rio Grande Basin
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Background
- Late 1800’s – Drought and Increased Irrigation
Diversion in Colorado
- 1896 – Federal Embargo on Water Development
- 1906 – Treaty of 1906
- 1916 – Elephant Butte Reservoir Operational
- Early 1920’s – Federal Water Development Embargo
Lifted
- Late 1920’s – Middle Rio Grande Conservancy
District
– Construct the MRGCD diversion dams, canals, drains, and El Vado Reservoir
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Background (Continued)
- 1929 – Interim Rio Grande Compact
– Sets limits on depletions of water
- 1935 – El Vado Reservoir Completed
– Supreme Court Lawsuit by Texas
- 1935-1937 – Rio Grande Joint Investigation
- 1938 – Rio Grande Compact Signed,
– Supreme Court Lawsuit dismissed
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The Rio Grande Compact
- Signed in 1938 in Santa Fe following
those four decades of controversy to:
– Effect an equitable apportionment of the waters of the Rio Grande above Ft. Quitman, Texas – Remove all causes of present and future controversy – Promote interstate comity
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The Rio Grande Compact
- The Compact apportions the waters of the
Upper Rio Grande Basin amongst the three States
- The Compact does not affect the obligations
- f the United States to Indian Tribes or impair
their Rights
- San Juan-Chama Project Water is not subject
to Compact apportionment
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The Rio Grande Compact - Colorado
- Colorado is Required to Deliver Water
to New Mexico at the Stateline
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The Rio Grande Compact - Colorado
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COLORADO ANNUAL COMPACT ALLOCATION - RIO GRANDE
200 400 600 800 1000 1200 1400 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 ANNUAL FLOW AT DEL NORTE (1000 af) ANNUAL COMPACT ALLOCATION (1000 a Available for Depletion in Colorado Colorado Delivery Obligation to New Mexico In above average year, flow in excess of 560,000 acre feet must be delivered to New Mexico.
The Rio Grande Compact - Colorado
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COLORADO ANNUAL COMPACT ALLOCATION - CONEJOS RIVER
100 200 300 400 500 600 700 100 200 300 400 500 600 700 ANNUAL CONEJOS RIVER INDEX SUPPLY (1000 af) ANNU AL COMPACT ALLOCATION (1000 a Available for Depletion Delivery Obligation to Rio Grande In above average year, flow in excess of 224,000 acre feet must be delivered to Rio Grande.
The Rio Grande Compact - Colorado
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The Rio Grande Compact – New Mexico
- New Mexico is Required to Deliver
Water to Texas at Elephant Butte Reservoir based upon flow at Otowi Bridge
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The Rio Grande Compact – New Mexico
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ANNUAL COMPACT ALLOCATION CHART
200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 3000 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 3000 ANNUAL INFLOW AT OTOWI (Otowi Index Supply, 1000 acre-feet) ANNUAL COM PACT ALLOCATION (1000 acre -fe e t)
New Mexico Delivery Obligation to below Elephant Butte Dam Available for Depletion above Elephant Butte Dam in New Mexico
In above average year flow in excess of 405,000 acre-feet must be passed below Elephant Butte Reservoir
Middle Rio Grande Compact Allocation and Obligation
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New Mexico’s Compact Compliance
Rio Grande Compact Cumulative Delivery Departure 1940 - 2006
- 600
- 500
- 400
- 300
- 200
- 100
100 200 300 1940 1950 1960 1970 1980 1990 2000
Time (Calendar Years) D eparture in Thousands of A F
2006 Credit = 37,100 AF
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New Mexico’s Compact Compliance
- NMISC Goal – Maintain compliance while allowing for
efficient and effective use of the available supply
- Status – in Compliance since the late 1960’s
- Activities –
– Middle Rio Grande Project – Operations of the Low Flow Conveyance Channel – ISC/Reclamation Coop Agreements – River System Maintenance – Metering and Modeling – Pilot Channel Work
- Other
– SJC Water Depletion Offset and Municipal Pumping
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Rio Grande Floodway in 1952
Looking downstream from south boundary of Bosque del Apache (courtesy of Reclamation)
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Compact Storage Restrictions
- If We Accrue Deliveries to Texas:
– Water Must be Retained in Storage in Post- 1929 reservoirs to the extent of the debits and cannot be used
- If Usable Storage in Rio Grande Project
Reservoirs is low:
– cannot increase the amount of native water stored in post-1929 reservoirs
- An accepted Relinquishment allows for some
upstream storage
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The Compact and Elephant Butte Reservoir
- Colorado and New Mexico Credit Water
is held in Elephant Butte Reservoir
- Spills from Elephant Butte Reservoir
eliminate credits and debits
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The Rio Grande Compact - Texas
- From Elephant Butte Reservoir to Fort
Quitman, Texas
– 57% of the Rio Grande Project Supply delivered to New Mexican’s
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The Rio Grande Project
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The Rio Grande Project
- Delivers water to the Republic of Mexico and irrigable
lands in New Mexico and Texas
- During full allocation years, Reclamation delivers about
931,800 AF at diversion dam canal headings with a reservoir release of 790,000 AF
- Hudspeth County Irrigation District is not part of the Rio
Grande Project
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500,000 1,000,000 1,500,000 2,000,000 2,500,000 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 ACRE -F E E T Maximum Available Storage Capacity
RIO GRANDE PROJECT STORAGE
Note: Storage values as of Jan 1 each year. Elephant Butte and Caballo Reservoirs included in analysis. Value for Jan 1, 2005 is estimated