Dual-Benefit, Unique Approach for Lake Protection: Harvesting Stormwater Restores Shields Lake
Thursday March 26, 2020
3:30 to 4:00 p.m. (Hall A)
Stormwater harvesting and use/reuse is a fast-emerging management technique.
In water-rich areas, application is being driven by runoff volume control targets (e.g. for stream baseflow augmentation). and the increased infiltration and evapotranspiration losses offer substantial pollutant load reductions. These benefits are offered even at sites with clay soils where it might otherwise be considered impossible to achieve volume control objectives.
The Shields Lake stormwater harvesting and irrigation reuse system, constructed in 2018, captures stormwater from 294 acres (119 ha) of agricultural and golf course lands that cover more than a third of the lake’s watershed. Stormwater is captured and stored in a pond that feeds into the golf course irrigation system via a 1,300 foot (400 m) pipe and pump system.
The system supplies up to 26 million gallons of water per year for irrigation, and captures 77 pounds (35 kg) of phosphorus annually. The system has achieved the final nutrient load reduction from the watershed called for in assimilative capacity studies.
Internal phosphorus loading from lake sediments will be addressed with an alum treatment to flip the shallow lake from a turbid to a clear water state.
1. Understand the unique capabilities of rainwater harvesting as a stormwater management practice even on sites with clay soils.
2. Learn how rainwater harvesting systems are designed.
3. Learn how design assumptions compare with post-construction monitoring data.
ABOUT THE PRESENTERS
Olivia Sparrow is Director of Canada Operations with Emmons & Olivier Resources Inc.
Olivia specializes in water resources modeling, stormwater BMP design, stormwater management planning, and BMP monitoring. Her work has included projects such as the cost-benefit analysis of more than 85,000 urban low impact development retrofit opportunities in Edmonton.
Olivia strives to mitigate the detrimental impacts of land development on water resources, natural resources, and human and wildlife communities through her work and research.
Jay Michels, CPESC, is Erosion & Sediment Control Specialist with Emmons & Olivier Resources Inc.
Jay has more than 35 years of experience in construction management, erosion control, and stormwater management. The emphasis of his work is in low impact development (LID) and stormwater pollution prevention.
His experience in planning, design, and construction management includes projects ranging from residential and commercial development to shoreline and streambank stabilization, and from highway and golf course construction to prairie and wetland restoration.