WSP03780

• File Number: 8040.960
• Description: Section D General Studies - Dams
• State: CO
• Basin: Colorado Mainstem
• Water Division: 5
• Date: 4/14/2003
• Author: Denver Water
• Title: Williams Fork Hydroelectric Project - FERC Number 2204 - Initial Information Package - IIP - For the Relicensing of the Williams Fork Reservoir Hydroelectric Project
• Water Supply Pro - Doc Type: Report/Study

I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I

001997

Initial Information Package
Williams Fork Hydroelectric Project
FERC Project No. 2204

Denver Water is issuing this Initial Information Package (IIP) which contains a
description of the Project location and history, general engineering design, Project
operations and historical operation, and environmental resources potentially
affected by Project operations, and maps showing the existing Project location
and boundaries. The IIP will be used as a reference document of existing
conditions during the relicensing process of the Project. The primary purpose of
the IIP is to help those interested in the relicensing process of the Project gain a
better understanding of the Project, its operation, and related environmental
resources.

Denver Water's water collection system is divided geographically into the South
System and the North System.

The South System includes the South Platte and Roberts Tunnel collection
systems. It is comprised of a series of storage reservoirs (Antero, Elevenmile,
Cheesman, and Strontia Springs) and trans-basin diversions from the Upper
Colorado River through the Roberts Tunnel (Dillon Reservoir). The South
System delivers water to the Foothills and Marston water treatment plants
(Figure 1.2.1.).

The North System encompasses the Moffat Tunnel collection system located in
the foothills of the Rocky Mountains to the north and west of the Denver
metropolitan area. The North System includes several storage reservoirs that
store water from South Boulder and Ralston creeks and trans-basin diversions
from the west-slope that enter the system through the Moffat Tunnel. The South
Boulder diversion and canal conveys water from Gross Reservoir on South
Boulder Creek to Ralston Reservoir. The North System delivers water to the
Moffat water treatment plant (Figure 1.2.1.).

The treated water facilities and infrastructure owned and operated by Denver
Water include:

. Foothills, Marston and Moffat water treatment plants, having a combined
production capacity of 645 million gallons per day ("mgd");

. 17 pump stations with a pumping capacity of I, 100 mgd;

. 29 treated water storage reservoirs in 17 locations totaling 38 I million
gallons; and

. 2,464 miles of pipe, 35,022 valves, and 13,298 hydrants.

The existing water system can meet an annual demand of 375,000 acre-feet' of
water.

] Acre-foot is a common measurement of large volumes of water. It is the amount of water required to cover one
acre of land to a depth of one foot or 325,851 gallons.

3