B07056.W-01A Complete - Stormwater [As Published] · 132007.2398

                                                                                                                              Appendix E


 Rainwater Tank Sizing
 Filename: H:\B07\050-099\B07056 - RSL Care Cooroy.WW\Misc\Water Balance\MS_071018\[Rainwater Tank Usage - North N3 - MS 071018.xls]Data En
 Date:     22/10/2007
 By:       MS

 Note:     Water Balance model for Northern Tank area


 Northern Catchment
 Model Start Date                                                 Domestic Usage Variables
 Start Year                           1928                        Equivalent Persons (EP)                              85.5
 Start Month                           1                          Daily EP Consumption (L/EP/day)                      240
 Start Day                             1                          Daily Household Use (L/day)                         20520

                                                                                                                                 RWT Usage
 Roof Details                                                     Breakdown of Domestic Use              %          RWT Use        (L/day)
 Roof Area (m2)                       8510                        External                              30%           y             6156
 % of Roof Draining to Tank           100%                        Toilets                               20%           y             4104
 Coefficient of Runoff                 0.9                        Laundry                               15%           y             3078
 1st Flush Depth (mm)                  0.3                        Hot Water                             20%                           0
                                                                  Kitchen / Bathroom                    15%                           0
 Rainwater Tank Details                                           TOTAL RWT Use                         100%                       13338
 Tank Volume (L)                      250000                      Mains Usage (L/day)                                               7182
 Dead Storage (L)                     12500
 Min Storage (L)                      13338                       Landscaping Water Usage Details
 Start Storage (L)                    125000                      Irrigation Rate (mm/m2/week)                              25
                                                                  Irrigation Rate (mm/m2/day)                             3.57
                                                                  Irrigation Area (m2)                                    9140

                                                                  Daily Irrigation Volume (L)                            32643
 Results
 Average Yearly Rainfall (mm)         1576                        External Use Variable
 Average Yearly Runoff (ML)           12.08                            Option 1      Always On                                       y
 Average Yearly Rainwater Usage (ML    6.89                            Option 2      Off when Raining
                                                                       Option 3      Off when Storage is Too Low
 Average Rainwater Supply                                              Option 4      Off when Raining or Storage is Too Low
 as % of Demand                        57%                             Option 5      Always Off




                                                                     !st Flush
                                                                         2%

                                                                                                Domestic Use
                                                                                                   19%




                     Landscape Use
                         38%




                                                                                           Overflow
                                                                                             41%




H:\B07\050-099\B07056 - RSL Care Cooroy.WW\Misc\Water Balance\MS_071018\Rainwater Tank Usage - North N3 - MS 071018