BOARD00179 ‎(2)‎

• Board Meeting Date: 5/23/2007
• Description: Director's Report - CWCB Director's Report
• Board Meetings - Doc Type: Memo

"

.

e:

.;

..

Aurora (population 300,000) is located in the eastern Denver metropolitan area. The
population is expected to exceed 600,000 people by 2050. Aurora's water supply comes
from three major river basins within Colorado and is sensitive to dry or drought
conditions. During average and above average years, the water supplies are ample to
meet the City's water demands. However, during dry conditions, water supplies are
limited because the water rights owned by Aurora are relatively junior. The Prairie
Waters Project is a key part of Aurora Water's comprehensive water resource planning.
To meet the demands of its existing customers in dry years, and to meet the increasing
demands on the system in the future, the goal of the PWP is to supply 10,000 AF/yr by
2010 and 15,000 AF/yr by 2017. Aurora Water will accomplish these goals using reusable
effluent from its existing portfolio of decreed reusable water rights, supplemented by
lawn irrigation return flows and junior water rights. A key component of the PWP is the
Conveyance System which includes three pumping stations and 33-miles of 60-inch
diameter pipeline to convey raw water from near Brighton, Colorado to a purification
facility near Aurora Reservoir. Total project cost is estimated at $800,000,000. Pipeline
installation is anticipated to commence in the fall of 2007. The total project is scheduled
to be complete in 2010.

14. Wood Lake Irrigation Company - Angel Lake Dam Repair

Authorization: Severance Tax Fund
Water Source: South Platte
Terms of Loan: $212,706@2.50% for 30 yrs.

County: Weld
Project Yield: 848 acre-feet
Project Type: Reservoir Rehabilitation

The Wood Lake Irrigation Company (WLIC) irrigates about 2,150 acres in northern
Colorado, in Weld County north of Greeley. WLIC facilities are located approximately 5
miles west of Eaton, and 2 miles east of Severance on Weld County Road 74, and consist
of Wood Lake (3,235 AF), Angel Lake (424 ac-ft with refill), and Meyers Lake (600 ac-ft.),
and approximately 5 miles of unlined ditch. WLIC's decreed water right for Angel Lake
is for 424.7 acre-feet with a refill, for a total 848 acre-feet. The Angel Lake dam is
approx. 2000 feet in length with a crest width of 50 feet (including roadway) and a max.
height of about 16 feet. The dam is located on the south and east sides of the reservoir
with the outlet located on the south side. Both the Angel Lake outlet conduit and
spillway conduits are in poor condition, and need repair/replacement to avoid future
SEO storage restriction. The outlet is an 18-inch clay pipe which has reached its usable
life span, and the service spillway conduit is an 18-inch clay pipe that is in very poor
condition. The proposed project will address deficiencies to meet the current standards
and requirements of the SEO with full replacement of the outlet works and service
spillway. Work will include breaching the dam embankment and removing the existing
outlet works; replacing the existing outlet with 30-inch diameter concrete pipe; control
structures including the intake structure with gate, gate tower with control gate, and
energy dissipation outlet structure; installation of a toe drain to intercept seepage;
construction of a service spillway incorporated into the outlet works to pass the 100-year

65