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 - Central C1 - MS 071019.xls]Data
 Date:     22/10/2007
 By:       MS

 Note:     Water Balance model for Central Tank area


 Central Catchment
 Model Start Date                                                 Domestic Usage Variables
 Start Year                            1928                       Equivalent Persons (EP)                              19.5
 Start Month                            1                         Daily EP Consumption (L/EP/day)                       240
 Start Day                              1                         Daily Household Use (L/day)                          4680

                                                                                                                                     RWT Usage
 Roof Details                                                     Breakdown of Domestic Use              %          RWT Use            (L/day)
 Roof Area (m2)                       2438                        External                              30%           y                 1404
 % of Roof Draining to Tank           100%                        Toilets                               20%           y                  936
 Coefficient of Runoff                 0.9                        Laundry                               15%           y                  702
 1st Flush Depth (mm)                  0.3                        Hot Water                             20%                               0
                                                                  Kitchen / Bathroom                    15%                               0
 Rainwater Tank Details                                           TOTAL RWT Use                         100%                            3042
 Tank Volume (L)                      39000                       Mains Usage (L/day)                                                   1638
 Dead Storage (L)                      1950
 Min Storage (L)                       3042                       Landscaping Water Usage Details
 Start Storage (L)                    19500                       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)            3.46                            Option 1      Always On                                           y
 Average Yearly Rainwater Usage (ML    0.90                            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                        53%                             Option 5      Always Off




                                                                     !st Flush
                                                                         2%




                                                                                                    Domestic Use
                                                                                                       26%




                                  Overflow
                                    72%




H:\B07\050-099\B07056 - RSL Care Cooroy.WW\Misc\Water Balance\MS_071018\Rainwater Tank Usage - Central C1 - MS 071019