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Yorkton Logan Green Project

How is the City of Yorkton Managing Stormwater? (refer to "Yorkton Stormwater Study" for background info)
  

In response to the extreme flooding that occurred in Yorkton on July 1, 2010, which was partly caused by an overwhelmed stormwater drainage system, the AWSA is contributing to the stormwater management component of a major development being constructed by the City of Yorkton in the city’s south region, the Logan Green Project.


The Logan Green stormwater pond is being constructed east of Yorkdale school, adjacent the community gardens. The pond is part of the overall Logan Green Water Management System being constructed by the City of Yorkton to showcase how “backwash waste water” from the city's new water treatment plant can be treated, managed, and utilized in an aesthetically pleasing, environmentally beneficial manner (through natural filtration via a series of constructed settling ponds, stream channel and fish pond). 


Representing the vision of many environmentally-minded individuals, the City of Yorkton’s Logan Green Water Management System is a uniquely simple solution to a very common challenge of operating a growing city. With the need for and creation of the new water treatment plant on the south end of Yorkton came a question for the project’s decision-makers; how to treat the backwash water prior to downstream release (into Yorkton Creek). Backwash water is the water discarded from cleaning the filter system at the water treatment plant. Previously, the city relied on a series of 4 individual treatment facilities to turn local groundwater into water ready for consumption. The backwash water was piped to and treated at the city’s sewage treatment center (west of the city’s landfill). The cost of piping water from the new treatment plant to the sewage plant was estimated at $3 million. The city instead came up with the idea to treat the backwash   water naturally- greatly reducing costs and the demand put on the sewage system.

The Logan Green Water Management System consists of two main parts:

1. Treatment of Backwash Water

  • Backwash water from the plant enters two settling ponds where the water is purified through natural settling-out of contaminants.
  • The water then travels through a man-made stream (complete with riffles to mimic natural habitat) to a newly      constructed trout fishing pond. From the pond water travels east overland, under highway #9, through a natural   wetland and eventually recharges the aquifer by flowing into the large borrow pit north of Flamans. Another large component of the overall Logan Green concept is the stormwater component.

2. Stormwater Management

  • A newly constructed stormwater pond will accept surface drainage from the area of the city located around the traffic circle as well as parts of Logan Crescent. The pond is considered a “dry bottom pond”, meaning the gradually sloped pond is designed to hold water only during and shortly after, storm events. 
  • The purpose of the pond is two-fold, providing both stormwater quantity and quality management. It stores stormwater, allowing it to drain in a slower, controlled manner, in addition to allowing the water time to settle. The settling causes silt, debris and contaminants to accumulate on the bottom of the pond, and vegetation seeded in the pond could potentially absorb those contaminates. From the pond, the purified water will flow in an overland channel that joins to the stream flowing from the water treatment settling ponds.

There are several other unique “green” aspects of the overall Logan Green concept that are worthy of recognition:

  • Rather than paying to have the fill from the ponds hauled offsite, it was used to create six much-needed sporting fields in Yorkton (complete with irrigation).
  • Rather than construct just another settling pond to treat backwash water, the city collaborated with the SK Wildlife Federation to create an urban fishing opportunity for all Yorkton residents to enjoy.

What Else is Going on at Logan Green?

There are several other unique features of the overall Logan Green concept that besides the stormwater pond, are worthy of recognition. The AWSA has acted as project facilitator to bring together the following agencies responsible for contributing towards their respective components of the project:

  • The Water Security Agency - Stream and riffle design
  • Ducks Unlimited Canada - Project signage and grass seed
  • Saskatchewan and Yorkton Wildlife Federations - Stream and riffle design, and fish pond
  •  Ag Canada - Planting of EcoBuffers and project signage
  • SK Ministry of Agriculture - Expertise regarding on-site grass establishment 

  

*** SEE ATTACHMENT AT THE BOTTOM OF THE PAGE FOR A DESIGN PLAN DIAGRAM OF THE LOGAN GREENS PROJECT ***
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J Nielsen,
Nov 23, 2012, 12:14 PM
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