BOARD02064

• Board Meeting Date: 3/21/2002
• Description: OWC Section - Drought and Water Supply Assessment
• Board Meetings - Doc Type: Memo

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Section 3
ReferencesjExperience (RFP Section 4.5)

Pagosa Water and Sanitation District
The Pagosa Area Water and Sanitation District and the San Juan
Water Conservancy District jointly contracted CDM to perform a '
feasibility study of the proposed Hidden Valley Reservoir and
Stevens Lake Dam Enlargement. Raw water supplies for the districts
originate from a combination of direct flow diversion rights and storage reservoirs in the San
Juan River and Piedra River basins in southwest Colorado. The feasibility study investigated
the reliability of the proposed projects to meet present and future demands under drought
conditions.

A computer model was developed by CDM to evaluate the operation of the districts' present
and proposed system. DWR databases were used to populate the model. Preliminary designs
and cost estimates for the proposed projects were also' developed. The results of the feasibility
, study were documented in a report submitted to CWCB as part of an application to the board
for project funding under the CWCB Construction Fund Loan Program.

Pertinent Project Attributes: Colorado drought

Ms. Carrie Campbell
Manager
970-731-2691

Northern Colorado Water Conservation District

CDM conducted a study that involved investigating the water demands,
the supply requirements, the yields, and the water system required to
serve 59 entities in three distinct service areas in northern Colorado.
Water demand forecasting was a major requirement of the study.
Alternative demand forecasting techniques were analyzed before selection
of an approach that was based on gallons consumed per household per day. These demand
values were applied.J:o three levels of population projections prior to selecting scenarios for
determining the final demands for the study. '

Water supplies available in terms of average annual and firm annual yields were determined
for each of the entities in the three study areas. This was done for sources as diverse as the
Colorado-Big Thompson Project and the Windy Gap Project, to shares in individual ditch
companies on Boulder Creek, St. Vrain,Creek, the Big Thompson River, and the Poudre River,
all major tributaries of the South Platte River. Surpluses arid deficits were determined for the
base years 1990, 2000, 2010, and 2020.

The study not only investigated physical demand and supply requirements, but also assessed
the feasibility of expanding regional operations between water agencies and identified the most
effective physical and institutionally feasible alternatives. CDM developed regional plans for
supplementing water supply for various regions in northern Colorado and east to Fort Morgan.
This study also involved modeling and conceptual level planning.

Pertinent Project Attributes: Colorado drought

Mr. Alan Berryman, Northern Colorado Water Conservancy District
970-667-2437

Section 3, Page-13