Swmp

Catchment B

    -    Area – 0.1485 Ha
    -    Tc – 13 mins
    -    Fraction Impervious (Fi) – 0.41



Peak flow rates for the median design storm for the existing site are given in Table 6.3

                                Table 6.3 – Existing Site Peak Flow Rates (L/s)

  Storm Event          Q1        Q2             Q5             Q10           Q20         Q50        Q100
                     (1EY)     (0.5EY)       (0.2EY)       (10%AEP)       (5%AEP)     (2%AEP)     (1%AEP)


        Cat A           79       119           160             186           218         259         287

  Existing PFR

        Cat B           27       39             52             59             69         83          91

  Existing PFR

 (PFR – Peak Flow Rate)

6.1.3     Proposed Site
The development consists of the construction of mixed residential townhouse/ unit development along
with a shared access driveway and ground level landscaping/ courtyards & a community pool area. The
total pervious area for the site was calculated to be approximately 1368m2.

The Developed site catchments are as follows.

Catchment A

    -    Area – 0.4363 Ha
    -    Tc – 6 mins
    -    Fraction Impervious (Fi) – 0.77

Catchment B

    -    Area – 0.1955 Ha
    -    Tc – 6 mins
    -    Fraction Impervious (Fi) – 0.83
    -




SCG Consulting Engineers                    Page 17                                SCG Ref: 33132(SWMP).RevB