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

members. These workshops will be held in conjunction with IBCC
meetings. Input received from BRT members during th ese workshop s will
be c onsidered by the study team in the formulation of refinements to be
made to subbasin models. The three workshops are envisioned to have the
following subject matter:

i. Introduction to the State’s Decision Support Systems .

ii. Development (method ology , data, ass umptions) of Decision
Support Systems for West Slope basins .

iii. Presentation/review of modeling results.
Additional consultations will be held with basin roundtable representatives
to discuss modeling of individual basin ’ s water supplies and demands.

Delive rable s
: Technical memoranda summarizing key operational criteria,
assumptions and results of state water allocation models of the Colorado River
tributaries (for review by BRT members). Written summary of BRT comments
and responses by the study team. Wri tten presentation material for workshop s , as
well as written summary of workshop , comments, and outcome.

Model Refinement of Existing Demand Levels
5. : Refine the operating
criteria/input data for existing demands in the StateMod model consistent with
resul ts of t he previous task. Refinement would be made incrementally with
testing for proper operation of each refinement . The result would be a “base
scenario” of existing demands for each subbasin for this study.

Deliverable
: Detailed task memorandum tha t describes the modeling refinements
that were implemented (and how) in StateMod.

Alternate Historical Hydrology Implementation
6.
Review/Selection/Acquisition
a. - Study team will conduct a literature
review/evaluation of alternative means of developing an “a lternative
historical hydrology” using tree ring reconstruction or other methods . A
method for developing alternative hydrologies will be selected and a
memo prepared describing the review/evaluation/ selection. Special
consideration shall be given to us e of a USBR methodology developed by
Jim Prairie for hydrologic simulations with the USBR CRSS model, which
methodology used reconstructed tree ring data to extract the system state,
a Markov model, and a nearest neighbor technique to resample years from
t he observed record for assigning annual flow values to the state
sequences.

b. Preparation of Alternate Historical Hydrology for CDSS Using Tree Ring
Reconstruction/Observed Records /Stochastic Methods - Apply the
Alternate Historical Hydrology method selected in the previous task to
historical streamflows and/or tree ring data (i.e. from University of
Arizona/Connie Woodhouse) for nodes in each of the major subbasins
(Yampa, White, Colorado mainstem, Gunnison, San Juan) in Colorado.
Colorado River Water Availability Study Scope 10 October 1 9 , 2007