12. APP G. Stormwater Management Plan

                EXISTING TOPOGRAPHY AND STORMWATER
                INFRASTRUCTURE
                Skyline Surveyor’s survey indicates that the site has a moderate grade (approximately 3%),
                ranging from approximately RL10.57 in the site’s southwest corner to RL7.54 in the site’s north-
                east corner. The site generally grades in a north eastern direction.
                There is a ridgeline located along the boundary of the two lots proposed for development. This
                has occurred because the site on Lot 4SP159610 has been excavated below natural surface in
                the southern area of the site, and as a result there are extensive retaining walls around
                southern boundary. The construction of Walter Hay Drive on the site’s northern boundary has
                caused a trapped sag to occur which has led to the installation of piped drainage discharge to
                the site’s east.


                DRAINAGE EASEMENTS
                There are two existing drainage easements on the site. One runs along the northern section of
                Lot 31SP170751 and another in the south – western corner of the same lot. In the developed
                state, these easements will be dissolved.




139 Eumundi Noosa Road & 30 Lionel Donovan Drive, Noosaville Service Station and Retail Site—Stormwater
Management Plans
Hyder Consulting Pty Ltd-ABN 76 104 485 289                                                                     3
f:\aa007595\f-reports\f0002-aar-aa007595 sbswmp report\f0002-aa007595-aar-03.-smp.docx