the potential for percolation within the sites. Detention areas can be incorporated to balance out peak flows and reduce the need for additional infrastructure downstream. However this may restrict the amount of available land for development and a compromise will need to be reached between on-site management and infrastructure upgrade. The first development is expected in 2016. By which time an ‘accepted development plan’ will have been established for the zone. The pan will outline the locatio and size of the pubc utities –oads, sewers, wateand stormwater infrastructure. Planning tools can be used to manage run-off co-efficients from new zones and in-fill housing. The design of floor levels in relation the surrounding land for new dwellings is a primary tool for managing future demand. The diversion of roof water into storage vessels has been considered but is unlikely to provide adequate flow reductions for the more problematic storm events. ‘Source Control’ continues to be the most effective demand management technique to protect the stormwater system from contaminants and spillages. By managing industrial and commercial site activities that have potential to pollute the stormwater system the need for elaborate engineering solutions such as oil interceptors, silt traps, etc is reduced 3.5 Asset Plans to Meet Demand The main capital investments related to growth have been conceptually considered and more detailed design is now underway. The main focus of attention is on the Murphys Creek and Casey’s Creek that drain the northwest urban development zones. The Stormwater Action Group continues to investigate the Camerons Creek, Yelverton Creek and Old Fairhall Creek sub- catchments that provide drainage to the Development Zone 6 zones. Page 33