E - Engineering Code Assessment.pdf

HYDROLOGY AND WATERWAY STABILITY


 Performance Outcomes               Acceptable Outcomes                    Response


PO10                               AO10                                    Complies.
Development prevents               The development is designed to:
increased bed and bank             (a) limit the peak 1 year ARI           Pre and post developed
erosion and sedimentation in           event discharge within the          peak stormwater flow rates
receiving waterways by                 receiving waterway to the pre-      were calculated for the 1-
avoiding changes in low rate,          development peak 1 year             Year ARI (63% AEP)
peak flow run-off and flow             discharge;                          design storm, and it was
duration.                          (b) maximise pervious areas by          found the flow rates to be
                                       using pervious alternatives for     comparable (18L/s). This is
                                       otherwise impervious areas          attributed to the small scale
                                       wherever possible;                  of the development site,
                                   (c) provide for capture and reuse       and relatively high existing
                                       of stormwater for non-potable       fraction impervious of the
                                       purposes for gardening, toilet      existing property.
                                       flushing, laundry and hot
                                       water supply uses;                  Refer to the accompanying
                                   (d) incorporate appropriate             Stormwater Report for
                                       detention features; and             calculations.
                                   (e) incorporate natural channel
                                        design principles OR
PO11                               AO11.1                                  Complies.
Water sensitive urban design       The design and construction of a
principles are applied to          natural channel or natural channel      The scale and design of
achieve multifunctional design     rehabilitation works are in
                                                                           the development is
of waterways, wetlands and         accordance with the Natural
drainage lines that provide for:   Channel Design Guidelines               consistent with the
                                   (Brisbane City Council) having          residential / medium
(a) stormwater conveyance
                                   regard to local topography,             density residential zoned
    that uses natural channel
                                   geology and geomorphology.              surrounds. No external
    design;
                                                                           catchments are conveyed
(b) protection of landscape        AO11.2                                  through the property.
    features and ecological        Landscape features, plant species
    important areas including      and habitat types used in
    terrestrial and aquatic        stormwater conveyance channels
    habitat;                       are complementary to the local
                                   context and natural waterways.
(c) aesthetic and passive
    recreation values;             AO11.3
(d) flood management and           Bank and bed stability and
    conveyance of external         planting densities result in a stable
    catchment stormwater           channel over the long term and
    through the development;       minimal potential for pest plant
(e) landscaping that               species.
    incorporates local native
                                   AO11.4
    species; and bed and bank      Water Sensitive Design measures
    stability.                     are incorporated into the
                                   development, as detailed in the
                                   document Water Sensitive
                                   Designs small improvements, new
                                   ideas, concepts and sketch
                                   designs for stormwater filtration
                                   systems (Healthy Waterways
                                   Water by Design).