The Mudflat Creek catchment is characterised by a distinct upper and lower section. The upper section of the catchment is located in the plateau area of Killcare Heights. This section of the catchment comprises of residential development around Wards Hill Road, The Scenic Road and Stewart Street together with a large proportion of natural bushland or rural type land. From the plateau the catchment slopes very steeply down undeveloped, densely forested slopes to the area bounded by Fraser Road and Hardys Bay. This lower section is relatively flat and low lying. Runoff from the plateau area drains to Fraser Road via two natural gullies. Pipe and overland flow systems convey flows from these natural gullies, through the residential areas to Mudflat Creek. Mudflat Creek then travels through the rear of properties 37-63 Fraser Road before reaching the bridge in Noble Road and its outlet to Hardys Bay. The recommended floodplain management measures for the Mudflat Creek catchment are summarised in Table ii in the summary report (The priority ranking is based upon a combination of reduction in flood risk, ease of implementation and cost/funding implications. There is no particular order of the measures within each priority categorisation).

Mudflat Creek is a 123 hectare catchment which drains to Hardys Bay through the lower Killcare district (refer Figures 1 and 2). The lower section of the catchment is predominantly occupied by urban residential development. A natural escarpment divides the lower section of the catchment from the upper plateau area. This upper plateau is predominantly natural or rural land type with some residential development around Stewart Street, The Scenic Road and Wards Hill Road (Figure 2). In light of reported flooding incidents in the study area, and following on from the Killcare Catchment Drainage Investigation that was completed in 1999 (Reference 1), Gosford City Council engaged Webb, McKeown & Associates to undertake a Flood Study. The primary objectives of this Flood Study are:,

Volume 1 and Volume 2 (Main Reports and Appendices)

South Creek is a 7.3 km2 catchment which drains to the southern shore of Narrabeen Lagoon through Cromer Golf Course (Figures 1, 2 and 3). The catchment area is predominantly occupied by urban development (59%) including both residential and commercial/light industrial development, with the remainder comprised of open space and forested areas (41%). The catchment has two main tributary branches. South Creek is the major watercourse and Wheeler Creek is the main tributary draining a significant proportion of the western catchment. In view of the increasing urban development and the need to accurately define the nature and extent of the flood problem, Warringah Council engaged Webb, McKeown & Associates to undertake a Flood Study. The primary objectives of this Flood Study are:,

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