Willow Street Storm Water Retention Pond

PROJECT. Willow Street Storm Water Retention Pond

LOCATION.  Gasoline Alley

OWNER. Red Deer County


Bryan Houle, P. Eng

Assistant Engineering Manager      

START DATE.  November 26, 2012

COMPLETION DATE.  February 15, 2013


TAGISH’S ROLE.  Prime Consultant



Tagish Engineering was commissioned to design, tender and inspect the construction of a large storm water retention pond and pipeline in Gasoline Alley for Red Deer County. This project consisted of stripping topsoil from an existing wetland, GPS controlled excavation of the retention pond, topsoil replacement, and site grading. As well, over 600 m of large diameter concrete pipe was installed, a storm outlet structure was placed directly into Piper Creek, more than a kilometer of chain link and barbed wire fencing was erected and the area was finish graded and seeded to grass. The process of obtaining Alberta Environment approvals was completed by Tagish Engineering, which included both wetland compensation and an approval to discharge storm water into Piper Creek. Additionally, a Department of Fisheries and Oceans approval was obtained as the construction of this project was within a major water body.This project was put into service on schedule and completed within budget restraints.



Tagish Engineering was responsible for all aspects of this project, from conceptual design to construction completion. The design process involved working with Alberta Environment and Fisheries and Oceans due to the site being in an environmentally sensitive area, as well as having a high pressure gas pipeline and water reservoir in the vicinity.


There were several changes requested by adjacent landowners during construction and Tagish was able to quickly direct the involved parties to accommodate them. The changes involved significant site re-grading adjacent to our storm water pipeline as well as the placement of clay and topsoil from the pond excavation.


Industry leading GPS guided equipment was used extensively in the construction of the retention pond. Tagish provided the contractor with a CAD based model of the finished product, therefore eliminating any additional excavation not required to build the desired shape. This saved Red Deer County considerable time and money over traditional methods.

The project also required the coordination with an outside contractor who was working adjacent to our project. The two projects were required to be connected to one another, and Tagish contacted both the contractor and their engineering consultant to ensure necessary steps were taken to successfully complete this connection.


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•    616 m of large diameter concrete storm water main installed

•   Precast storm water outfall was placed directly into Piper Creek

•   73,000 cu.m. of topsoil and subsoil excavated

•   GPS controlled grading of storm water pond with 24,500 cu.m. of storage

•   1,200 m of chain link and barbed wire fencing installed

•   All parts of construction complied with the rules set by Alberta Environment and Department of Fisheries and Oceans for working within a major water body



•   Project Scope Definition and Preliminary Design

•   Detailed Design and Consultation for the Project

•   Preliminary Engineering, Cost Estimating and Comparisons

•   Procurement of all required Approvals and Licenses

•   Tender Preparation

•   Contract Administration

•   Detailed Site Survey

•   Construction Inspection

•   Project Management