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 - South S3 - MS 071019.xls]Data E
 Date:     22/10/2007
 By:       MS

 Note:     Water Balance model for Southern Tank area


 Southern Catchment
 Model Start Date                                                 Domestic Usage Variables
 Start Year                           1928                        Equivalent Persons (EP)                              129
 Start Month                           1                          Daily EP Consumption (L/EP/day)                      240
 Start Day                             1                          Daily Household Use (L/day)                         30960

                                                                                                                                 RWT Usage
 Roof Details                                                     Breakdown of Domestic Use               %         RWT Use        (L/day)
 Roof Area (m2)                       14425                       External                               30%          y             9288
 % of Roof Draining to Tank           100%                        Toilets                                20%          y             6192
 Coefficient of Runoff                 0.9                        Laundry                                15%          y             4644
 1st Flush Depth (mm)                  0.3                        Hot Water                              20%                          0
                                                                  Kitchen / Bathroom                     15%                          0
 Rainwater Tank Details                                           TOTAL RWT Use                          100%                      20124
 Tank Volume (L)                      350000                      Mains Usage (L/day)                                              10836
 Dead Storage (L)                     17500
 Min Storage (L)                      20124                       Landscaping Water Usage Details
 Start Storage (L)                    175000                      Irrigation Rate (mm/m2/week)                              25
                                                                  Irrigation Rate (mm/m2/day)                             3.57
                                                                  Irrigation Area (m2)                                    6430

                                                                  Daily Irrigation Volume (L)                            22964
 Results
 Average Yearly Rainfall (mm)         1576                        External Use Variable
 Average Yearly Runoff (ML)           20.47                            Option 1      Always On                                       y
 Average Yearly Rainwater Usage (ML    9.22                            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                        58%                             Option 5      Always Off




                                                                     !st Flush
                                                                         2%

                              Landscape Use
                                  23%                                                               Domestic Use
                                                                                                       22%




                                                               Overflow
                                                                 53%




H:\B07\050-099\B07056 - RSL Care Cooroy.WW\Misc\Water Balance\MS_071018\Rainwater Tank Usage - South S3 - MS 071019