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 - RAC R1 - MS 071019.xls]Data En
 Date:     22/10/2007
 By:       MS

 Note:     Water Balance model for RAC Tank area


 RAC Catchment
 Model Start Date                                                Domestic Usage Variables
 Start Year                           1928                       Equivalent Persons (EP)                              120
 Start Month                           1                         Daily EP Consumption (L/EP/day)                      180
 Start Day                             1                         Daily Household Use (L/day)                         21600

                                                                                                                                    RWT Usage
 Roof Details                                                    Breakdown of Domestic Use              %          RWT Use            (L/day)
 Roof Area (m2)                       3779                       External                              30%                               0
 % of Roof Draining to Tank           100%                       Toilets                               20%             y               4320
 Coefficient of Runoff                 0.9                       Laundry                               15%             y               3240
 1st Flush Depth (mm)                  0.3                       Hot Water                             20%                               0
                                                                 Kitchen / Bathroom                    15%                               0
 Rainwater Tank Details                                          TOTAL RWT Use                         100%                            7560
 Tank Volume (L)                      50000                      Mains Usage (L/day)                                                  14040
 Dead Storage (L)                      2500
 Min Storage (L)                       7560                      Landscaping Water Usage Details
 Start Storage (L)                    25000                      Irrigation Rate (mm/m2/week)                                   0
                                                                 Irrigation Rate (mm/m2/day)                                 0.00
                                                                 Irrigation Area (m2)                                           0

                                                                 Daily Irrigation Volume (L)                                   0
 Results
 Average Yearly Rainfall (mm)         1576                       External Use Variable
 Average Yearly Runoff (ML)           5.36                            Option 1      Always On
 Average Yearly Rainwater Usage (ML   1.71                            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                       22%                             Option 5      Always Off                                          y




                                                                    !st Flush
                                                                        2%




                                                                                                      Domestic Use
                                                                                                         32%




                              Overflow
                                66%




H:\B07\050-099\B07056 - RSL Care Cooroy.WW\Misc\Water Balance\MS_071018\Rainwater Tank Usage - RAC R1 - MS 071019