PUB00108

• Year: 1986
• Title: St. Vrain Basin Reconnaissance Study
• CWCB Section: Administration
• Author: Colorado Water Resources and Power Development Authority
• Description: Extensive study for future study and development toward meeting the water-related needs of residents with the St. Vrain Basin
• Publications - Doc Type: Brochure

Step 2 - Formulation of Water Resource Development Alternatives

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1-6

Step 2 of the Study began in October 1984 with the completion of a
revised Plan of Study. Revisions were made in recognition of the revised
Study scope which resulted from input from the publ ic and from the Study
Advisors. As indicated in Table 1-2, 13 specific tasks including the Final
Report were completed for Step 2.

The main emphasis of Step 2 was to formulate and evaluate up to six
alternative water resource management plans. An important part of plan formu-
lation was the need to identify and evaluate plan elements. Plan elements are
the bui Iding blocks for the alternatives and include existing structural fea-
tures, potential structural features, and non-structural elements, also
referred to as "measures." Evaluations were performed on 98 structural ele-
ments and 26 non-structural elements to determine which plan elements could to
some degree meet the adopted plan purposes and which would be sui table for
plan formulation. A computerized River Basin Simulation Model (RIBSIM) was
used as a tool in analyzing water yield aspects of performance of the formu-
lated plans.

Information obtained in the previous tasks of Step 1 and Step 2 was
used in the plan formulation process. Study team members with expertise in
the areas of water resource planning, hydrology, water rights, economics,
hydraul ic design, and envi ronmental and social analyses met in workshop ses-
sions to formulate nine preliminary alternative plans representing a range of
potential water resource development for the St. Vrain Basin. The alternative
plans include combinations of structural and non-structural measures for meet-
ing the municipal, industrial, and agricultural water supply needs of the
Basin. Five of these plans were selected for evaluation in Task 2-9. A sixth
plan was subsequently formulated by CWRPDA staff, fol lowing response from the
publ ic and Advisors to the results of Task 2-9.

Both prior to and following evaluation, the alternative plans were
presented to the Study Adv i sors. Comments f rom the pub Ii c and the Study
Advisors were presented to the Study Management Commi ttee and incorporated
into the Final Report and Summary Report.

(B0349C)