Agriculture and Irrigation - Request for Proposal - Twin Valley Dam – Mechanical and Chemical Rehabilitation of Relief Wells

12 days leftSource: APC
Issuing body
Agriculture and Irrigation
Location
Alberta
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Trades

Scope

Organization: Agriculture and Irrigation PROJECT OVERVIEW Project Background – Twin Valley Dam and Reservoir (formerly known as Little Bow River Dam project) are located in southern Alberta, approximately 100 km south-southeast of Calgary, and are operated and maintained by Alberta Agriculture and Irrigation (AGI), Water Infrastructure and Operations Branch (WIOB). Twin Valley Reservoir is used to regulate flows of the Little Bow River and Mosquito Creek for municipal water supply, irrigation, conservation, and recreational purposes. The project was completed in 2002, and the reservoir reached its full supply level (FSL) of 964.8 m for the first time in 2004. Its storage capacity at FSL is 61,700 dam3 and the maximum height of the dam is 26 m. Twin Valley Dam is classified as a “very high” Consequence Dam (Canadian Dam Association [CDA] Guidelines, 2007). The classification of the existing project is governed by the large economic damages that would result from a potential cascading failure of Twin Valley Dam with Travers Dam. The dam has an internal drainage system within the downstream slope of the dam embankment to alleviate impacts from water seeping through the structure. The internal drainage system consists of an inclined chimney drain and a horizontal blanket drain. A portion of the seepage which enters the system is carried to the downstream toe of the dam by six outlet finger drains which discharge into a gravel-lined collector drainage ditch. Additional seepage is managed by passive pressure relief wells which are located approximately 15 m downstream of the chimney drain. The current system consists of 11 relief wells installed in the alluvium and underlying bedrock. Well depths vary from 22 to 25 m, and each well is equipped with an upper and lower screened section. The lower screen allows water under pressure to enter the well from the underlying alluvial-bedrock aquifer(s). The upper screen is installed across the collector drain and allows the w

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Last checked August 13, 2026

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