Question: Existing catchment ( pre - development condition ) : Dense bushland, high soil permeability. T c = 3 0 min. Proposed development ( post -

Existing catchment (pre-development condition): Dense bushland, high soil permeability. Tc=30min.
Proposed development (post-development condition): Residential land uses, lot sizes >750m2(fraction impervious =0.6).Tc=20min.
Existing catchment ( pre - development condition

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