The State Government has pledged almost $30 million to remove thousands of tons of rotting sea grass from a failed canal development in Port Geographe.
The government will spend $28.15 million to make "significant structural changes" to the port area around the estate, Troy Buswell announced this morning.
Developers built a series of groynes to keep the estate's canals open during the 1990s.
But each winter, much to the original investors and local resident's dismay, the groynes trap vast masses of seaweed which rots and emits hydrogen sulphide, casting a smell not dissimilar to rotten eggs over the area.
Residents say the odour is so bad it makes them sick and they have to keep their doors and windows sealed for months at a time.
Transport Minister Troy Buswell said in a statement issued this morning the multi-million dollar project would modify the shape and length of the western breakwater; remove the pocket beach groynes to eliminate trapping of seagrass and sediment; realign the foreshore; and change the eastern seawall to address beach erosion at Wonnerup.
The changes are part of the recommendations to come out of a three-year government-commissioned study.
"The extensive research, investigation and modelling undertaken has provided the basis for structural changes that will address health issues, improve amenity and reduce ongoing annual coastal maintenance costs," he said.
Developers - including businessman Luke Saraceni - had originally paid for the weed to be removed but the project went into voluntary administration in August this year.
The State government is already facing a $1.5 million bill to clean up this year's accumulation of the stinking weed.