PUB00027

• Year: 1990
• Title: Final Report Rio Grande Water Supply Study, Phase 1
• CWCB Section: Interstate & Federal
• Author: San Luis Valley Water Conservancy District
• Description: Reconnaissance level determination of the physically and legally available flow at 4 reservoir sites in the Rio Grande Basin upstream of Del Norte, Colorado
• Publications - Doc Type: Brochure

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activities were also performed for the Rio Grande Water Supply Study, the following

activities are referred to as Step One activities.

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1. The collection and analysis of data necessary to conduct the study.

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2.

An analysis of those provisions of the Rio Grande Compact relating to
water deliveries at the Colorado - New Mexico stateline and development
and operation of post-compact reservoirs in Colorado.

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3.

A description of the proposed facilities and operating characteristics
of the Closed Basin Project.

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4.

A Description of the manner in which water rights are administered on
the Rio Grande in Colorado, and

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5.

An analysis of storable flows at four potential reservoir sites.

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The storable flow analysis was conducted on a monthly basis for a 38-year study

period. Three of the four potential reservoir sites were located on the mainstem

of the Rio Grande in Colorado and one on the South Fork of the Rio Grande.

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During Step One of the study) three meetings were held in Monte Vista to discuss

the Plan of Study, work in progress and the Step One results with the SLVWCD, the

Division Engineer for Water Diversion No.3 and others. Two meetings were held with

the State Engineer and Deputy State Engineer in Denver on the same items.

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At the conclusion of Step One in late 1987, a series of meetings were held with

the State Engineer and representatives of various San Luis Valley water user groups

to discuss the Step One study results. Based on these discussions, the decision

was made by the CWCB and the SLVWCD to proceed to Step Two of the study in order

to refine some of the assumptions and analyses of Step One, particularly with regard

to the future operation of the Closed Basin Project and certain provisions of the

Rio Grande Compact.

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In March 1988, the CWCB approved a preliminary scope of work and budget for the

Step Two analyses. Study costs were apportioned between the CWCB and the SLVWCD.

The June 1988 Plan of Study included the following major tasks:

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1.

A review of the assumptions used in Step One of the study,

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