Appendix B - Amended Biome Consulting Response

2.2       TOPOGRAPHY AND SITE DRAINAGE
The majority of the site falls from its western boundary (Cooroy Connection Road) to the eastern boundary (Trading Post
Road). There are two existing gullies traversing the site which discharge to two separate existing dams (central and
southern). These two dams then join to a larger “combined” dam downstream on property Lot 4RP215922. The
“combined” dam then discharges to an existing swale along the north-eastern boundary of the Lot before discharging to
the lawful point of discharge (Central Discharge Point B). There are two external catchments discharging to the site from
Cooroy Connection Road via two existing box culverts below the road.

To the north of the site a smaller catchment discharges to the existing northern dam before discharging downstream
(Northern Discharge Point A).

The highest point on the site is near the intersection of Cooroy Connection Road and Pearsons Road at RL 111 m AHD.
The lowest point at the eastern corner of the site at the base of an existing swale is approximately at RL 97 m AHD
adjacent to Central Discharge Point B. The average grade of the central gully is approximately 2% and the southern gully
is approximately 4%, as measured from the western boundary to the eastern boundary.

Refer to Drawing No. B14158.W-SK100 in Appendix G for existing stormwater catchments, existing gullies and dam
locations.

2.3       SITE DISCHARGE LOCATIONS
The site has two main discharge locations as detailed below:

•   Northern Discharge Point A – A small portion of the site to the north and external catchment (approximately 2.4ha)
    is directed towards the northern boundary.
•   Central Discharge Point B – A large portion of the site and external catchment (approximately 16.2ha) is directed to
    the west via an existing swale located within the site.

Refer to Drawing No. B14158.W-SK100 in Appendix G for discharge locations.




16-001014-01B | STORMWATER MANAGEMENT PLAN                      COOROY RETIREMENT COMMUNITY, TRADING POST
(SWMP) | PALM LAKE RESORTS                                                                  ROAD, COOROY                |6