Green lake ‘not harm­ful’

Southern Gazette (South Perth) - - STREET WATCH -

CON­CERNS about the qual­ity of wa­ter in Neil McDougall Park in Como have been raised.

The City of South Perth said the green mat­ter was not al­gae but duck­weed, which was not harm­ful to hu­mans or wildlife.

Gerry Cole­man, who works in the area as a gar­dener, con­tacted the South­ern Gazette with con­cerns about the con­di­tion of the lake.

“In a way it looks beau­ti­ful but when you con­sider that birds and wildlife and swim­ming in it, it doesn’t look very healthy,” he said.

“I think the coun­cil should be held ac­count­able to fix it or even bring in the ex­perts.”

Mayor Sue Do­herty said the growth of duck­weed was re­lated to high nu­tri­ent lev­els in the lake.

“McDougall Lake is a re­ceiv­ing wa­ter body for stormwa­ter in the area which picks up nu­tri­ents from the sur­round­ing catch­ment area,” she said.

“Th­ese nu­tri­ents are then de­posited into the lake. The duck­weed feeds off this nu­tri­ent and cou­pled with warm weather con­di­tions it flour­ishes.”

Ms Do­herty said the re­sult of rain in Fe­bru­ary and the con­tin­ued warm weather fur­ther nu­tri­ent-loaded the lake, which en­abled the duck­weed to grow for a longer pe­riod.

“As the weather cools the duck­weed will re­duce in den­sity,” she said.

“While duck­weed is not harm­ful to wildlife or peo­ple, the City’s en­vi­ron­ment team mon­i­tor the oc­cur­rence and den­sity of duck­weed in McDougall Lake on a reg­u­lar ba­sis.

“In the 2017-2018 fi­nan­cial year a wa­ter sen­si­tive ur­ban de­sign up­grade is planned for one of the in­lets to help to re­duce nu­tri­ents be­fore they en­ter the lake.”

The duck­weed in the lake at Neil McDougall Park.

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