Appendix B - Stormwater Management Plan

Other adjacent properties at 35 and 35A Tait Street.

35 Tait Street: Existing Catchment =            0.388Ha,
                                                165m length of grass/treed area at 3.4%, tc = 17 minutes,
                                                fi = 0, C10 = 0.70, C5 = 0.67, C100 = 0.84.

                                                Q5        = FCIA = 1/360 x 0.67 x 124 x 0.388 = 0.090cumecs

                                                Q100      = FCIA = 1/360 x 0.84 x 200 x 0.388 = 0.181cumecs


35 Tait Street: Developed Catchment =           0.115Ha,
                                                Urban lot area at 3.4%, tc = 10 minutes,
                                                fi = 0.4, C10 = 0.78, C5 = 0.74, C100 = 0.94.

                                                Q5        = FCIA = 1/360 x 0.74 x 156 x 0.115
                                                          = 0.037cumecs - 0.030cumecs roofwater (3 lots)
                                                          = 0.007cumecs

                                                Q100      = FCIA = 1/360 x 0.94 x 251 x 0.115
                                                          = 0.075cumecs - 0.030cumecs roofwater
                                                          = 0.045cumecs


House        Pre-development          Post-development flow         Pre-development flow        Post-development flow
number      flow Q5 in cumecs             Q5 in cumecs                Q100 in cumecs              Q100 in cumecs

  35               0.090                       0.007                        0.181                      0.045

Again mostly due to new road catchment and roofwater drainage a significant reduction in flow occurs as a result
of development without any detention. Detention for overall flow increases from subdivision will be dealt with at
14 Eagle Drive basin.

A similar order of flow reduction will apply for lot 35A Tait Street.

Summary of Drainage Improvements/Non Worsening.

The existing area has a number of drainage issues, and as per Callaghan and Toth previous investigations the
best way to resolve the existing issues and cater for new subdivision is to create an overland flow path through
14 Eagle Drive with detention capacity. This solutions proposed will enable a non-worsening outcome for new
subdivision flow in relation to surrounding properties in accordance with Council Planning Scheme Policy.




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