Green Acres Wetland Stabilization Project
Location - within the Parkland County in NE18 and NW17-52-27-W4
Project Description
The Green Acres Stabilization Project was constructed to stabilize a wetland located in NW17 & NW18-52-27-4 at a definite full supply level and to alleviate flooding to properties adjacent to the wetland. The wetland was drained west to Atim creek via an underground drainage pipe, with a gated control structure at the wetland. A flap valve was installed on the pipe outlet that exits to a ditched channel to Atim creek in the NE1/4 18-52-27-4. The control structure allows the wetland to be controlled at the full supply level as well as to control the flow to Atim Creek.
The construction entailed the installation of 552 m of 600 mm diameter PVC pipe, the installation of a inlet weir structure complete with control gate, installation of a cleanout manhole, auguring the pipeline under Range Road 275 and ditching of 22 m from the wetland to the inlet structure and 53 m from the end of the pipe to Atim Creek.
Services Provided by Sameng Inc. (In addition to those listed above) :
Investigation into past water levels on the wetland.
Bathometric surveys of the wetland.
Surveys of lands adjacent to wetland.
Surveys of possible routes to drain the lake (wetland had no outlet).
Determined hydrology for the lake (water balance).
Work with Ducks Unlimited to determine their desired wetland level.
Public relations with landowners around the lake re wetland control elevation.
Determining capacity requirements of outlet system.
Designing outlet system and preparing report for submission to Alberta Environment for cost sharing and for application for approval under the Alberta Water Act.
Replying to concerns raised as a result of advertising the project.
Prepare tender documents (specifications and drawings).
Construction surveys and project management.
Progress payments.
Key Consultant Staff
Gerald Samide, P. Eng.
Company Technician.
Company’s survey crew.
Start-up and Completion Date
The contact was awarded in September 1999 and completed, except for incidental burning of the cleared trees, in October 1999.
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Longhurst Lake Stabilization Project
Location - The proposed project is on Atim Creek just downstream of Longhurst Lake approximately 5 km south of the Town of Stony Plain. The project is located in NE1-52-1-W5.
Project Description
In 1990 a modified culvert weir structure was constructed to control the level of Longhurst Lake. It consisted of 2-1200 mm diameter culverts installed in an earth berm, with the culvert inlet ends cut to form a three-sided rectangular lip (weir). However, the inlet elevation would fluctuate as a result of frost action and settling. Parkland County retained Sameng Inc. to design a stable efficient lake control structure. Sameng Inc. designed a water level control structure consisting of sheet piling driven to a depth of 10 m (AZ13 – Trade Arbed Canada Inc.) around the existing weir inlet culverts in the form of a square “U” with the ends tied into the berm. The front portions of the existing culverts were cut off at a 45-degree angle resulting in the culverts being shortened and the weir inlets removed. Rip rap was installed between the inside of the sheet piling and the edges of the culvert. Rip rap was also installed around the outside edges of the sheet piling. An emergency overflow area in th e berm was also constructed.
Services Provided by Sameng Inc.:
Historical review of lake levels.
Surveys of the existing outlet structure, berm and outlet watercourse.
Determined lake levels that would occur with the proposed lake control structure for various flood events.
Soil test holes done by Sameng Inc. and soil analysis done by J. R. Paine & Associates Ltd.
Designed a steel sheet piling control structure and prepared a report for submission to Alberta Environment for cost sharing and for application of a licence under the Water Resources Act.
Replied to concerns raised as a result of advertising the project under the Water Resources Act.
Applied for approval from DFO on behalf of Parkland County.
Prepared tender package (drawings and specifications).
Provided construction surveys and project management.
Key Consultant Staff
Gerald Samide, P. Eng.
Al Lang, P.Eng.
Company Technician.
Company’s survey crew.
