As part of the permitting process, the U.S. Army Corps of Engineers (Corps) evaluates numerous alternatives to City's preferred alternative – the Halligan Reservoir enlargement. Other water supply alternatives studied to date require:
- Piping and pump stations
- Greater greenhouse gas emission due to ongoing pumping requirements
- Some level of pre-treatment required before water can be treated at our water treatment facility
- A higher cost per acre-foot of water
Several alternatives are evaluated in the Halligan Project Environmental Impact Statement (EIS), including:
- Enlargement of the proposed Glade Reservoir (if constructed as part of the Northern Integrated Supply Project (NISP))
- Acquisition of dedicated storage in existing agricultural reservoirs near Wellington
- Use of existing and expanded gravel pit reservoirs along the Poudre River near Overland Trail
All alternatives are described and compared in the draft EIS. The Corps is also evaluating a no-action alternative.
The Corps will select the least environmentally damaging practicable alternative (LEDPA) to permit, which may be an alternative other than the enlargement of Halligan Reservoir.
Halligan Water Supply Project
(Fort Collins Utilities' Proposed Action)
|Expanded Glade Reservoir Alternative||Gravel Pits Alternative||Agricultural Reservoirs Alternative||No-Action Alternative|
|Average Annual Power Required||0 kWh/yr*||837,680 kWh/year*||735,210 kWh/yr*||526,250 kWh/yr*||0 kWh/yr*|
|Permanent Impacts||160.0 acres||69.0 acres||17.0 acres||11.0 acres||0 acres|
|Temporary Impacts||31.5 acres||69.5 acres||111.5 acres||373.0 acres||0 acres|
|*Includes pumping and treatment operations|
If We Do Nothing#
Our region's semi-arid climate means the amount of water available from month-to-month and year-to-year varies, especially during dry years and drought. Without additional storage, future Fort Collins Utilities customers are vulnerable to reductions in water supply during prolonged drought or emergencies. As a result, more frequent and severe water restrictions would be likely. Fort Collins Utilities currently owns far less independent storage per customer than many other Front Range water providers.