Project Details

WSUD Category: Wetland/lake algae management

Development Type: Public Open Space
Function/Driver: Water quality
Government Area: City of Canning
Year Completed: 2019

 

Type of wetland

  • Natural & Constructed
  • Comments: Mix of both. Existing wetland modified to accept stormwater.

Wetland management issue

  • Seasonal wetland /drainage basin with high winter water levels and lower summer water levels;
  • High levels of organic matter and detritus present;
  • Nutrient inputs from birds and surrounding drainage network;
  • Experienced a microcystis algae bloom (blue green algae) in late summer 2019;
  • Installed health warning signs advising against direct water contact activities for humans and animals are installed;
  • The City experiences periodic algal blooms in a number of stormwater retention lakes as water levels drop and temperatures increase.

Treatment trialled

  • Name of treatment: Aquasphere Pro
  • Quantity used: One sphere was placed in a section of the basin, which through low water levels had separated from the remainder of the basin.  The product supplier states that one sphere treats 1.8 million litres of water.
  • Method of application: Apply sphere into affected area so that it is completely covered with water.
  • Is there any known scientific research supporting its effectiveness? ☐ Yes  ☒No

Date(s) of treatment

One off trial – March/April 2019

Outcome of treatment

  • Visual observations: Rapid algal break down and water clarity improvement within one week of application.  Application coincided with a slight drop in the temperature of the waterbody.
  • Have water parameters specific to the treatment claims been measured before and after application? ☐ Yes ☒ No
  • Comments: Have begun applying to other local lakes.

 

Contact Officer:  David Mort

Email: [email protected]

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