Never mind such things as costs, trees and other arguments I believe we should be including consideration of deciding between detain it or flush when making the final decision on Brownhill Creek.
Why the change?
I have a real issue with being responsible for allowing this to be possible.
I am also troubled as a builder (once again) with us not trying to detain the flow. Providing a retention/detention tank on site is a must now in order to obtain development approval in many councils for any building work in excess of as little as 40 m2 of roof area. The reason for this is to delay the flow of stormwater/roof rainwater for a period of 2 or 3 days after a severe storm. The reason for this in turn is to avoid choking up the street stormwater system that can no longer cope with storms and the flooding that will inevitably eventuate.
And here as I read it we are creating a greater flow than probably all the houses that are being redeveloped together could create and saying that is a preferred option.
I will be looking for assurances on this.