Swales considered for drainage

Gosford Council has been told that grass swales could cost-effectively address drainage issues on the Peninsula.

However, specific projects had not been costed.

Council's director of city services Mr Stephen Glen stated in answer to a question on notice from Cr Jeff Strickson that grass swales in the appropriate location were an environmentally-effective method of collecting stormwater drainage by removing sediments and nutrients before reaching local waterways.

"In the case of Lone Pine Ave there is partially existing kerb and gutter, pipe drainage and underground services in the road reserve and the proposal for grass swales would require the removal or modification of this infrastructure, which is not practical in terms of council funding," Mr Glen stated.

Mr Glen stated that grass swales were a "relatively cheap" alternative to kerb and gutter treatment and maintenance.

However, he said the construction costs involved in swales had not yet been well studied.

Mr Glen highlighted the importance of maintenance for grassed swales which would require a maintenance contract including seasonal mowing of dried swales, erosion inspections, litter removal, replanting and remove of sediment build-up.

Council agenda COR.59, 26 May 2009