SDA-1116-034770 - 23 Jirrima Crescent - Information request (concurrence agency)

                                                                                        SDA-1116-034770

Item     Information requested
         no lower than ground level and the roots are to be left in the ground to aid in
         stabilisation. If deep excavation is required during construction the roots may only be
         removed within the construction footprint area under this code.”

         Please provide further information on this aspect of the development and how the
         development will not increase the risk to fisheries resources if this requirement cannot
         be met.

3.       PO4 – response to AO4.2 of SDAP Module 5.2; If the barrier remains in place,
         fish passage provision in accordance with the approved design and operation is
         maintained as long as the barrier remains.
         Please detail how the culvert will be maintained so that the fish passage features of
         the structure (e.g. low flow channel and culvert cells) remain navigable by fish (i.e. not
         silted up or block by debris).

4.       PO10 – Offsets.
         Without detailed designs of the culvert crossing, it cannot be determined whether the
         proposed development will result in a significant residual impact to fish passage.
         Please provide detailed design drawings including information on the design features
         incorporated into the culvert design that have been utilised to allow for fish passage
         through the structure. Refer to the DILGP Significant Residual Impact Guideline –
         section 3.8 “Waterways providing for fish passage” to determine if a significant
         residual impact is expected.
5.       PO20 - Fish passage is provided for:
         (1) in the inherent design of the waterway barrier works
         (2) over the in-situ life of the barrier in that position through adequate
             construction and maintenance of the barrier.

         Please confirm through providing detailed plans that the culvert design will comply with
         the design provisions of the self-assessable code WWBW01- Part 3 Culvert Crossings
         for Amber waterways.

         If the plans are not in line with the self-assessable code, please provide detail on the
         following, in relation to the culvert crossing:
              - The expected drown out characteristics of the culvert crossing and the ability
                  for fish to cross the barrier under all flow conditions – i.e. water velocities will
                  not exceed 0.3ms through the low flow channel
              - The expected timing and duration of drown out events and the delay expected
                  to fish passage when there are flows in the system but no fish passage being
                  provided.

6.       PO23 - Waterway barriers that are culverts provide adequate fish passage for
         the site, and:
         (1) fish passage is provided for the life of the crossing
         (2) hydraulic conditions (depth, velocities and turbulence) from the
             downstream to the upstream limit of the structure allow for fish passage of
             all fish attempting to move through the crossing at all flows up to the
             drownout of the structure.

         Please provide the following information in relation to the culvert crossing design:
            - please provide information on why a bridge is not suitable at this site (i.e. the
                reason a culvert has been proposed instead of a bridge)
            - provide information or drawings which detail that the culverts cells extend 100




Department of Infrastructure, Local Government and Planning                              Page 2