Ground­wa­ter use to be mon­i­tored

Wanneroo Times - - News - Tyler Brown

EDITH Cowan Univer­sity and the State Gov­ern­ment are team­ing up to mon­i­tor ground­wa­ter use in Perth’s ur­ban wet­lands and cli­mate change.

The univer­sity was ap­pointed through a com­pet­i­tive process man­aged by the Depart­ment of Wa­ter and En­vi­ron­men­tal Reg­u­la­tion to con­duct wet­land veg­e­ta­tion and macroin­ver­te­brate and wa­ter qual­ity stud­ies on the Gnan­gara Mound in 2018.

The Gnan­gara ground­wa­ter sys­tem is Perth’s largest and most re­li­able fresh wa­ter re­source and pro­vides al­most half of met­ro­pol­i­tan Perth’s wa­ter sup­ply.

Sur­face wa­ters in many of the wet­lands sup­ported by the Gnan­gara ground­wa­ter sys­tem have de­clined over the last 30 years and on­go­ing assess­ment helps tar­get man­age­ment re­sponses.

Re­sponses to de­clin­ing wa­ter lev­els so far in­clude re­duc­ing the amount of ground­wa­ter taken for pub­lic wa­ter sup­ply and lim­it­ing it from sen­si­tive ar­eas that af­fect wet­lands and lo­cat­ing ground­wa­ter re­plen­ish­ment sites.

Wa­ter Min­is­ter Dave Kelly said it was im­por­tant to recog­nise the sci­en­tists and nat­u­ral re­source man­age­ment of­fi­cers that col­lect the data.

“Since this assess­ment work started over two decades ago, cli­mate change has re­duced the av­er­age win­ter rain­fall by around 25 per cent of the long-term av­er­age over that time,” he said.

“For this rea­son, we have given the green light for fur­ther ground­wa­ter re­plen­ish­ment to sup­port the use of this sys­tem for pub­lic wa­ter sup­ply and we are work­ing with wa­ter users to be more wa­ter-ef­fi­cient.”

Wanneroo MLA Sabine Win­ton said she was thrilled the Gov­ern­ment was plac­ing “such an em­pha­sis on con­tin­u­ing the im­por­tant work of sci­en­tific mon­i­tor­ing of our lo­cal lake sys­tems”.

“Our un­der­stand­ing of the chang­ing con­di­tions and health of the wet­lands in the north­ern cor­ri­dor is very im­por­tant,” she said.

“Lake Now­er­gup to the north of Wanneroo is a per­fect ex­am­ple of how im­por­tant this sci­en­tific work has been for our con­tin­ued un­der­stand­ing of the chang­ing con­di­tions and health of this im­por­tant wet­land.

“Lake Now­er­gup is the deep­est per­ma­nent lake in the met­ro­pol­i­tan area.”

Nak­isa Shahrestani, Prof Pierre Hor­witz, Joon­dalup MLA Emily Hamil­ton, Wanneroo MLA Sabine Win­ton and Wa­ter Min­is­ter Dave Kelly at Lake Joon­dalup.

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