1890 Effluent Disposal Review · MCU20/0022

4.4   Design Parameters (Cottage)

         The “design” soil category is based on 5 – light clay.
         The inferred design-loading rate (DIR) for these soil types is 3mm/day
         Wastewater flow allowance for the residence is 120 litres/person/day
         For a two-bedroom cottage, we have allowed for 3 persons (three cottages)

          Total loading = 360 litres/day per cabin


4.5   Calculated Irrigation Area
      For a design irrigation rate (DIR) of 3mm /day, this results in an irrigation area of
      360m2.


4.6   Noosa Council require a minimum 9 fixed sprinklers per 100m² of effluent application
      area. We propose thirty (30) fixed sprinklers.

4.7   Precautions
      The client proposes to adopt surface irrigation methods, which will require the effluent
      to be disinfected. The following precautions should be observed:

      Land Application Area:
          Not to be used for purposes that compromise the effectiveness of the system or
            access for future maintenance purposes.
          Be used only for effluent application.
          Have boundaries clearly delineated by appropriate vegetation or other type of
            border.
          Have no runoff or seepage of effluent beyond the designated areas.

      Irrigation System:
             Distribute the effluent evenly within the designated areas.
             Control the droplet size, throw and plume height of the sprinkler system so that
              the risk of aerosol dispersion and effect of wind drift distributing any effluent
              beyond the designated area is negligible.
             Have warnings, complying with AS 1319 or NZS/AS 1319, at the boundaries
              of the designated areas in at least two places, clearly visible to property users,
              with wording such as, “Recycled Water – Avoid Contact – DO NOT DRINK” .
             Ensure that the effluent does not come into contact with people, domestic or
              farm animals of any crops intended for human consumption.



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