181002_25 Kauri St_Cooroy_B_Final · MCU18/0165

25 Kauri St, Cooroy                                                      360 Civil Consulting Pty Ltd


360 Civil Consulting Drawings P01 to P03 are contained in Appendix E and detail the extent
of the required frontage works.

    9. Stormwater Management – Quantity and Quality
Hydrology and Water Management Consulting (HWMC) have been engaged to complete a
Stormwater Management Plan for the development. Please refer to this report for full
details of the WBNM modelling undertaken to determine stormwater detention and MUSIC
modelling undertaken to determine stormwater bio-retention basin requirements.

HWMC have determined that the development site must provide: -

       36m2 filter area; and
       100m3 on-site detention with 240mm dia outlet orifice.

360 Civil Consulting Drawings P01 to P03 are contained in Appendix E and show the
proposed location of the bio-retention basin and the on-site detention. It is proposed that
the on-site detention will be split between approximately 50m3 accommodated in the bio-
retention / detention basin and the remaining 55.5m3 accommodated in underground
detention tanks. The outlet for this stormwater system will be to the existing council
stormwater infrastructure on Kauri St, north of the development. The bio-retention basin
will have a 900mm weir to allow the overflow of large storm events onto Kauri St.

    10. Earthworks
The existing low point of the development site is the north-western corner of the lot where
the proposed bio-retention / detention basin will be located. In order to achieve a
stormwater gravity discharge system to the bio-retention basin some filling of the lot will be
required. Preliminary calculations indicate that a balanced cut/fill over the site will not be
achieved and that some imported fill will be required. Some retaining along the Kauri St
frontage will also be required to accommodate this fill. It is anticipated that retaining will be
less than 1m in height.

    11. Waste Management
The development will be accommodated with a bulk bin storage area and the proposed
location is shown on 360 Civil Consulting Drawing No. P01. On-site waste collection will
occur with the Waste Collection Vehicle (WCV) accessing via either Olivine St or Kauri St to
collect the waste. Due to the internal road layout the WCV will be able to enter and exit the
site in a forwards gear and no on-site reversing will be required.

    12. Sewer Connection
The Dial Before You Dig sewer infrastructure plan for the development site is contained in
Appendix C. There is an existing sewer reticulation main that traverses the north-eastern
2018068 – Engineering Services Report                                                   Page 8 of 18