Appendix J - Water Supply and Wastewater Servicing Report

Lutheran Services                                                                               Page 10 of 15
PF80 - Cooroy Care Farm
24 May 2018                                                                                Ref. No. 2017.0616




       3.5           Borewater Supply
       A new borewater supply is to be established on the site.
       Advice has been obtained from a local water bore driller with experience in this area indicating
       that it should be possible to develop a groundwater bore on this site. The bore is likely to be
       located on the ridgeline to the northern edge of the site, with a depth of approximately 60m.
       The water is expected to be good quality though not suitable for consumption without filtration
       and disinfection.
       Bore yields of between 50 to 100 kL per day are expected, ie more than adequate as a reserve
       supply to the development.
       Investigations are on-going to locate and establish a suitable water supply bore at the site.


       3.6           Water Treatment
       The harvested roofwater will require treatment before use as it will contain contaminants washed
       from roof surfaces and gutters, including leaf litter, dust and animal droppings. As noted above,
       the groundwater will also require disinfection. Combined roofwater / borewater treatment will
       include:
       ▪ Coarse filtration to remove larger particles;
       ▪ Pressure media filtration to remove fine solids to manage turbidity;
       ▪ Activated carbon filtration to remove any organic chemicals;
       ▪ Ultraviolet (UV) irradiation for primary disinfection;
       ▪ Chlorine (as sodium hypochlorite) dosing as a secondary disinfectant and to provide residual
         protection in the distribution system.


       3.7           Design Details
       The proposed water supply configuration includes:
       ▪ Provide rainwater tanks at each building with water pumped to a central raw water storage;
       ▪ Provide an on-site borewater supply pumping to the raw water storage;
       ▪ Provide a central roofwater treatment plant with treated water storage tank;
       ▪ Distribute the water to the buildings using a pumped pressure system.
       The following system configuration has been adopted. The system arrangement and the location
       of central water storage facilities and treatment plant is indicated in Appendix B – Figure B1.

Table 7 Potable Water Supply Configuration

 Component                                      Details
 Target supply reliability                      85%
 Rainwater storage volume                       850 kL total storage
                                                (approx. 50 kL at each major building and 25 kL at
                                                each minor building plus a central 450 kL raw water
                                                tank
 Borewater backup                               Single on-site bore with an equipped capacity of
                                                around 1 L/s plus rising main to raw water tanks