How the Rio Grande Compact Functions Water and Natural Resources - - PowerPoint PPT Presentation

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How the Rio Grande Compact Functions Water and Natural Resources - - PowerPoint PPT Presentation

Jan 25, 2024 295 likes •539 views

How the Rio Grande Compact Functions Water and Natural Resources Committee Meeting, Las Cruces New Mexico 10/15/13 Page 1 of 50 The Rio Grande Compact Covers the Upper Rio Grande Basin The Rio Grande Compact of 1938 divides the surface

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How the Rio Grande Compact Functions

Water and Natural Resources Committee Meeting, Las Cruces New Mexico 10/15/13

Page 1 of 50

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The Rio Grande Compact Covers the Upper Rio Grande Basin

  • The Rio Grande Compact of

1938 divides the surface waters of the Upper Rio Grande Basin amongst Colorado, New Mexico, and Texas

  • The Upper Rio Grande Basin
  • From headwaters of Rio

Grande in Colorado to Fort Quitman, Texas

  • The basin includes parts of

the 3 states and two countries

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Platoro Dam in Colorado

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The Rio Grande Compact - Colorado

  • Colorado is Required to Deliver Water to

New Mexico at the Colorado-New Mexico Stateline

– At the Lobatos Bridge

  • The amount of water required to be delivered

to the Stateline is determined based upon the gage record of: – The Rio Grande at Del Norte – Three locations on Conejos River System

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The Rio Grande Compact - Colorado

Lobatos Del Norte Conejos System

Source: Colorado DWR

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The Rio Grande Compact – New Mexico

Upper Rio Grande Basin of New Mexico If depletions change between the Stateline with Colorado and Otowi Bridge, modify Middle Rio Grande allocation

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The Rio Grande Compact in NM – Upper Rio Grande

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The Rio Chama Valley below Abiquiu Dam

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The Rio Grande Compact – New Mexico

Middle Rio Grande Basin of New Mexico New Mexico is Required to Deliver Water to Elephant Butte Reservoir (the Rio Grande Project): There is an explicit allocation of the flow measured at the Otowi gage and delivery to Elephant Butte

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Otowi Gage

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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 COMPACT ALLOCATION (1000 acre-feet)

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 Allocation

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  • 600
  • 500
  • 400
  • 300
  • 200
  • 100

100 200 300 1940 1945 1950 1955 1960 1965 1970 1975 1980 1985 1990 1995 2000 2005 2010 2015

Accrued Credit/Debit (KAF) Time (Calendar Years)

Rio Grande Compact Compliance 1940 - 2013

There is no approved accounting for 2011 and 2012. Under all proposed accounting methods New Mexico remains in an accrued credit status.

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5% 21% 37% 37% Reservoir Evaporation Crops Riparian Urban (groundwater depletion with wastewater offset) Total Mean River Depletions: approximately 613,000 acre-feet per year

Middle Rio Grande River System Depletions

Source: SSPA, July 2000 Water Supply Study of the Middle Rio Grande

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The Rio Grande Compact – New Mexico

Lower Rio Grande Basin of New Mexico Prior to the 2008 Operating Agreement, 57% of the Rio Grande Project Supply used in New Mexico

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