Dual-Benefit, Unique Approach for Lake Protection: Harvesting Stormwater Restores Shields Lake

December 17, 2020 @ 12:00 pm – 1:00 pm
$15 - $30
Victoria Kring

This webinar will address internal phosphorus loading from lake sediments with an alum treatment to flip the shallow lake from a turbid to a clear water state.

This webinar is being offered as part of the TRIECA 2020 Webinar Series.


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 hectares) 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-metre) pipe and pump system.

The system supplies up to 26 million gallons of water per year for irrigation, and captures 77 pounds (35 kilograms) of phosphorus annually. It 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.