Ivins City

Project:

Ivins City Tuacahn Wash Upper Detention Basin

Client:

Ivins City

Description:

Alpha Engineering has been working with Ivins City on the Tuacahn Wash improvements in various phases for over 10 years. Projects completed on Tuacahn Wash include the design of riprap for a section of the Tuacahn Wash within Ivins City, design of culvert crossings on Center Street and Tuacahn Drive, and the ongoing design of the Tuacahn Detention Basin. Design work included completion of a hydrology study and HEC-RAS analysis of a section of Tuacahn Wash.  In addition, RB&G Engineering was selected to assist in the geotechnical design of the earthfill dam structure and construction observation. The dam is an earthfill dam with internal filter and is 18 feet tall with a holding capacity of 36 acre-ft. Design included a trash rack and outlet works with a reinforced concrete energy dissipation structure. This facility has been classified as High Hazard by the State Engineer and the design has been coordinated and approved by the State Dam Safety office. The Alpha/RB&G Team provided full-time project management and inspection of the construction.

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Kane County Water Conservancy District

Project:

KCWCD Jackson Flat Reservoir

Client:

Kane County Water Conservancy District

Description:

Alpha Engineering teamed with RB&G Engineering to complete the design and construction management of the Jackson Flat Reservoir, an off-stream reservoir fed by the existing Kanab Creek Diversion and irrigation system. The project consists of a multi-zoned earthen dam, the extension of the existing irrigation system, a pump station, extensive drainage facilities, a spillway, and access roads. The reservoir has a maximum dam height of 45 feet and stores 3,800 acre-feet of water. Hydrologic and hydraulic analyses were performed to design different components of the facility including the outlet works, emergency drain, and spillway. The design was coordinated and approved by the State Dam Safety office.  Survey and staking services were provided to the contractor along with full-time and on-site inspection and construction management. As part of the design, an Emergency Action Plan, which included a Dam Break Analysis, and a Standard Operating Procedure for the reservoir was completed and approved by the State Engineer.

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Washington County Water [...]]]> Project:

WCWCD Sand Hollow Reservoir & Pipeline

Client:

Washington County Water Conservancy District

Description:

Alpha Engineering teamed with RB&G Engineering to complete this project.  The Sand Hollow Reservoir & Pipeline project consisted of construction of two central core rockfill dams, installation of 25,000 linear feet of 60 inch diameter steel pipeline, the construction of a reinforced concrete pump station building, and some modifications to the existing Quail Creek Hydroelectric plant. The project was completed in April 2002 and serves as the main water source, along with Quail Creek Reservoir, for Southern Utah as well  as a popular recreational facility.

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