CRWaterAvailabilityScope - Final Phase I Scope

• Title: Water Availability Study of Colorado River and Tributaries Phase 1 Scope of Work
• Date: 10/19/2007
• Author: CWCB
• Interbasin CC - Doc Type: General Resources

Table 1
1

Portion of SWSI Table 7 - 4, Colorado River Compact Analyses Results
Table 7 - 4 Comparison of Es timated and Projected Depletions under Colorado's Share of the Colorado River Compact
CWCB
Upper Colorado River BOR DSS
Depletion Schedule Estimate Estimate SWSI Estimate
2030
Demand
with No
Change
1996 - 1996 - in 2030 2030
1 991 - 2000 2030
2000 2000 Irrigated High Low
Item
1995 Projected Projected Average Average 2000 Acres Demand Demand
Current Depletions
Agricultural – Irrigation and 1500 1500 1500 1430 1345 1259 1259 1259 1259
Stock
Municipal/Domestic 19 19 19 35 27 42 42 42 42
Power/Industrial 35 35 35 19 18 22 22 22 22
Minerals 21 21 21 4 4 0 0 0 0
Exports 606 606 606 480 476 520 520 520 520
Reservoir Evaporation 84 84 84 82 117 117 117 117 117
TOTAL 2265 2265 2265 2048 1987 1960 1960 1960 1960
Future Depletions Eliminated from Table Presented for Illustration Purposes – but Included in Summary Information in Below Rows
Summary of Depletions 2265 2391 2675 2048 1987 1965 2148 2436 2084
Evap - Storage Units 295 295 295 354 354 348 341 341 341
TOTAL DEPLETIONS 2560 2686 2970 2402 2341 2313 2489 2 777 2425
Colorado Allocation 3079 3079 3079 3079 3079 3079 3079 3079 3079
Remaining Available 519 393 109 677 738 766 590 302 654
Percent of State Share 17% 13% 4% 22% 24% 25% 19% 10% 21%
Unused
1
Above table illustrates analyses based on SWSI estimat ed legal availability under Compact during a critical drought
period. SWSI estimated legal water availability to Colorado under Compact ranges up to 3.855 million af per year.

Deliverable
: A memorandum, for distribution to BRT members, summarizing the
me thodology, assumptions and results of the comparative analyses performed in
this study of “Colorado’s remaining Compact Entitlement”.

Preliminary Assessments of Phase I Water Availability
9. – Additional validation
of Phase I activities will occur through pr esentation of a number of simula tions
that demonstrate water availability with Phase I water demands and Phase I
alternate hydrologic traces.

a. Formulation of scenarios of Phase I Demands and Alternate Hydrologies –
The consultant will formulate up to ten sc enarios of Phase I demands, and
Phase I recent historic and alternate hydrologies.

b. Water Availability Simulations – Prepare water availability model and
perform simulations for the ten scenarios.

c. Summarization of Water Availability Simulations – Prepare ta bular and
graphical summaries of flow and water availability results at key flow
stations (see task 4.a). Summaries will include comparisons of modeled
depletions and flows with range of Colorado’s allowable depletions and
flows (from Task 8) and include modeled depletions for general priority
classes of modeled water rights.
Colorado River Water Availability Study Scope 14 October 1 9 , 2007