Attachment 4 - Engineering Report · MCU18/0015

       In order to comply with the above conditions, it is proposed to direct all roof
       runoff to rainwater attenuation/reuse tanks. A 5kL rainwater detention tank will
       be provided for each new dwelling (covenant requirement) for stormwater
       attenuation as per the previous section, with a second tank with capacity of 3kL
       provided for indoor non-potable and outdoor irrigation reuse.

       Access driveway runoff will be directed to Rapid Infiltration Pits (RIP’s) for
       minor event treatment, with major event overflow discharging via a stabilised
       level spreader into the existing gully within the site.

       Please refer to the attached preliminary engineering drawings for details and
       locations of the proposed RIP’s.

       An 1800mm diameter x 1700mm RIP is proposed to accept discharge from each
       access driveway sub-catchment. Where required, pits will be linked by overflow
       pipework which will discharge major storm event runoff to the existing
       waterway via a stabilised level spreader.

       Please refer to the attached engineering drawings in Appendix C for locations of
       the rainwater tanks and rapid infiltration pits.

       This approach is considered to satisfy the requirements of the above listed State
       and Council guidelines.

7.0    SEWERAGE RETICULATION

       Proposed units 1-12 will be connected to reticulated sewer via an internal gravity
       sewer network than will connect to the existing manhole SM2668739 in Picture
       Point Crescent with an Invert level of 19.35m AHD (from UW records).

       Proposed Lot 2 can readily connect to existing manhole SM2670601 located just
       outside of north-east boundary. Similarly, proposed Lot 3 can be serviced by the
       existing manhole SM2670583 located in Alma Way.

       It is proposed that Lot 4 be serviced by a privately owned packaged pump
       station with macerator, which will lift effluent to the existing manhole in Alma
       Way, SM2670588. Adjacent gravity reticulation is approximately 3-5m above
       expected lot finished floor levels.



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C5756/17/Engineering Report - 27 Attunga Heights, Noosa Heads          6
January 2017   JW/jl