1909-13367 SRA referral response approved docs

CO NT E NT S

1           Introduction ............................................................................................................................ 5
2           Site Description ..................................................................................................................... 5
2.1         Location and Land Use ............................................................................................................ 5

2.2         Lawful Point of Discharge ........................................................................................................ 6

2.3         External Catchment ................................................................................................................. 6

2.4         Flooding ................................................................................................................................... 6

3           Stormwater Quantity Management ...................................................................................... 6
3.1         Existing Catchment and Site Drainage .................................................................................... 6

3.1.1       Existing Hydrology ................................................................................................................... 7
3.2         Proposed Developed Site Drainage ........................................................................................ 8

3.3         Existing and developed site comparison ................................................................................. 8

3.4         On site Detention (OSD) .......................................................................................................... 9

3.5         Waterway Stability ................................................................................................................. 11

3.6         Critical Storm Durations ......................................................................................................... 12

4           Stormwater Quality Management ....................................................................................... 13
4.1         Operational Phase ................................................................................................................. 13

4.2         Stormwater Quality Treatment solution ................................................................................. 13

4.3         Construction Phase ............................................................................................................... 15

4.3.1       Erosion and Sediment Control ............................................................................................... 15
4.3.2       Maintenance and Monitoring Requirements .......................................................................... 16
5           Conclusion ........................................................................................................................... 18
6           Appendices ..............................................................................................................................
6.1         Appendix AA – Erosion Hazard Assessment ....................................................................... AA

6.2         Appendix AB – MUSIC details .............................................................................................. AB

6.3         Appendix AC – Engineering Drawings ................................................................................. AC




FIG U R E S


        Figure 1 – Indicative Site location (NearMap 2019) ..................................................................... 5

        Figure 2 - XPSTORM model layout. ............................................................................................. 9

        Figure 3 – MUSIC Model & Pollutant load reductions ................................................................ 14




                                                     Stormwater Management Report                                                                      3
S19-007                                                122 & 144 Myall St, Cooroy