Interesting thread, good to read a range of views.
There's been a challenge set about providing proof of flooding for the site, and how the Council views whether the site is flood-prone... this is from the Sutherland Shire Council website (http://www.sutherlandshire.nsw.gov.au/Environment/Waterways/Flooding_in_Sutherland_Shire):
STUDY NAME
Lower Georges River Floodplain Risk Management Study & Plan
DATE
ongoing
RIVERS AND CREEKS IN STUDY
Lower Georges River from confluence with Woronora River downstream to Botany Bay
DOCUMENTS
[none - usually weblinks for other studies]
So, one can assume by "ongoing" that the Council has been or is re-evaluating whether the area including Endeavour Field and surrounds is flood prone?
But, digging a little bit deeper into the Council site, via the "Shire Maps" link in the first paragraph, you can pull up the Council Flood Prone Land map.... If this works, I have attached the pic for the area around Endeavour Field to this post - there are clearly "areas of potential flood prone land" (pink) and "areas below the flood planning level" (blue) on that site.
It shows clear flood zone issues with the blue area (which I remember in years gone by as a field/parking lot?), and more worryingly the pink area over Solander Filed (if that's part of the proposed development). That's as good as it gets that there's proof it is considered a flood worry, and no wonder the development plans are not sailing through approvals smoothly...
The DGRs also includes the following - "provide an assessment of any floodrisk on site in consideration of any relevant provisions of the NSW Floodplain Development Manual 2005".
The manual applies to floodplains across NSW, in both urban and rural areas.
"The manual was gazetted, as the manual relating to the development of flood liable land for the purpose of section 733 of the Local Government Act 1993"
Section 733 - Exemption from liability - flood liable land, land subject to risk of bush fire and land in coastal zone.
Reference also to Section 149 of the EP&A Act.