Appendix J - Water Supply and Wastewater Servicing Report

Lutheran Services                                                                                                                                         Page 9 of 15
PF80 - Cooroy Care Farm
24 May 2018                                                                                                                                      Ref. No. 2017.0616




Table 6 Roofwater Balance Model Results

 Parameter                                                                                      Results
 Available Roof Area (m 2)                                                                      8,000
 Supply Reliability                                                                             80%                        85%
     Distributed Tank Volume (kL)                                                               400                        400
     Central Tank Volume (kL)                                                                   200                        450
     Total Tank Volume (kL)                                                                     600                        850
     Average Annual Demand (ML/yr)                                                              6.3
     Average Annual Volume Supplied (ML/yr)                                                     5.1                        5.4
     Average Annual Shortfall (ML/yr)                                                           1.3                        1.0
     Proportion of Available Rainfall Captured                                                  60%                        63%


                                                                                   Cooroy Care Farm
                                                                                Roofwater Water Balance
                              7,000                                                                                                                              100%

                                                                                     Annual Demand
                                                                                                                                                                 90%
                              6,000
                                                                                                                                                                 80%
                                          85%
                                          80%
                              5,000
   Average Volume (ML/year)




                                                                                                                                                                 70%
                                             Demand Met
                                            with Rainwater
                                                                                                                                                                 60%
                              4,000
                                                                                                               Top Line: 400 kL Distributed Storage
                                                                                                                                                                 50%
                                           % Rainfall                                                          Middle Line : 200 kL Distributed Storage
                                           Captured                                                            Bottom Line: 100 kL Distributed Storage
                              3,000
                                                                                                                                                                 40%


                                                                                                                                                                 30%
                              2,000
                                                               Supply
                                                              Shortfall                                                                                          20%

                              1,000
                                                                                                                                                                 10%


                                 0                                                                                                                               0%
                                      0                 200               400      600           800              1,000             1,200             1,400
                                                                                   Total Storage Volume (kL)


Figure 5 Roofwater Balance Model Results