WSPC01361

• File Number: 8283.200
• Description: Colorado River Basin-Colorado River Computer Models-Colorado River Decision Support System-Ray
• State: CO
• Water Division: 5
• Date: 3/25/1994
• Title: Consumptive Use Modeling-Task 1.14a-Evaluation of Consumptive Use Models-Matrix for Evaluating Consumptive Use Models
• Water Supply Pro - Doc Type: Operating Principles/Plan

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Task 1.14(a) . Evaluation of Consumptive Use Models

Matrix for Evaluating Consumptive Use Models

l. Introduction;

The primary objective of this task is develop an evaluation matrix to identify the
appropriate consumptive use models for use as part of CRDSS. A review of the Feasibility
Study, information from a survey of the future users of CRDSS, and an investigation of
possible models will identify an appropriate consumptive use models for CRDSS. It is
assumed there will be close coordination with the State's technical sub.committee on
consumptive use modeling. The following consumptive use categories have been identified in
ExhibitA: Scope a/Services:

. Crop evapotranspiration
. Soil Moisture Depletion '-- "(
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. Stock Pond Use

Livestock Use
. Municipal and Industrial Use

. Exports
. Reservoir Evaporation

II. Evapotranspiration Models Matrix

It is currently assumed that the most computationally intensive portion of estimating
consumptive use will be the crop ET category. Therefore, the matrix will focus on models for
this category.

List of Crop Evapotranspiration Method Criteria: ~yx

1. Type of method used to calculate crop evapotranspira~~n (Etp), ~ ,-"V '0
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2. Type of method used to detennine consumptive irrigation 'requirement (CIR).
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3. The availability of crop coefficients.

4. Can the model accurately estimate Et of alfalfa and meadow grass?

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What data are required?
The availability of required input data.
Is the method transferable for use in the entire CRDSS area?
Predicted accuracy of monthly Et values.
If a reference crop is used, and if so what reference crop is used,

10. Ranking of method in table 7.18 (page 246) of ASCE Manual 70,
11. Are the crop coefficients basal or mean coefficients?

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12. Can the method calculate monthly El.

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Does the model have a stress component to reduce Et when the water supply is limiting?
14. What methods are used to estimate effective precipitation?

3/25/94. Evaluation Document (for internal use) I

Matrix for Model Evaluation; CSU- AOOl