Reference Document - Stormwater Management Plan - RAL26/0001 (As Published)

       A registered easement for stormwater              As this is the existing point of discharge and
        discharge/works                                   conveyance of flows through the Site, maintaining
       Written discharge approval                        quantities and velocities to a pre-development state
                                                          would result in no actionable nuisance occurring.

                                                          Therefore, a further assessment is undertaken below.

Common Law: Principles of nuisance                        If the existing discharge point is maintained, and
                                                          discharge quantities and velocities are maintained as
Alterations to the natural flow regime will be lawful     per the pre-developed state, then no third-party
if all necessary statutory approvals have been            damage is occurring, and this gives no rise to
obtained and complied with, and:                          actionable nuisance claims.

       There is no nuisance or interference to the       Therefore, if the development can maintain these
        use or enjoyment of affected land; or             pre-development attributes when discharging from
       The affected land owner has consented to the      the Site in the post-developed state, the alterations
        change in drainage                                will be lawful.

   TABLE 1 LPOD ASSESSMENT AGAINST PROPOSED DEVELOPMENT




   3. STORMWATER CHARACTERISTCS

   3.1. Comparison of Pre/Post Development and Quantity
   The development proposes to increase the impervious area of the site by using the following
   parameters:

           Increased impervious area of the access easement to Lot 2
           100% impervious area of Lot 2’s building envelope area
           50% impervious area of Lot 1’s area in accordance with Table 4.5.1 of QUDM (for Urban
            residential – low density).

   To summarise the development characteristics throughout the modelling and Council’s IR process, a
   table has presented the various changes below.

            Report revision                     Post-Development impervious catchment (%)
                           1                                         31
                           2                                         45
                           3                                         57
   TABLE 2 DEVELOPMENT CHARACTERISTICS WITH REPORT REVISION




   The developed catchment increases from the 31% to 57% and the modelling has been updated to
   account for this change in Table 3.