Stormwater Drainage

Stormwater must be contained on-site unless ground conditions are deemed unsuitable for on-site disposal via infiltration as verified by a geotechnical investigation, soil permeability testing and a site classification report prepared by a suitably qualified civil engineer. The Town will only consider applications that can demonstrate that all on site disposal options have been investigated and exhausted.

Local Planning Policy No. 14 - Stormwater

Stormwater Drainage Approval

You will need approval where stormwater cannot be accommodated on-site and connection to the Town’s stormwater drainage system is proposed.

Applicants will need to provide the following information:

  1. An Infrastructure Services - Application for Permit;
  2. Geotechnical report justifying offsite storm water disposal;
  3. A completed modified COPAS equation for stormwater retention (Please refer to Worked Example – Modified COPAS Equation for Stormwater Retention);
  4. A comprehensive stormwater drainage plan prepared and certified by a suitably qualified engineer, detailing: sizes and types of all materials; invert levels; pit levels (top and bottom); design return period; site retention capacity and outlet capacity for the design return period; internal drainage design and grades of all pipes; and
    Please note, all surveys for existing invert levels and pipe alignment (etc.) are the responsibility of the landowner/applicant to obtain.
  5. Payment of fees associated with connecting to the Town’s stormwater infrastructure in accordance with Council's adopted schedule of fees and charges. 

All Fees must be paid prior to the commencement of works.

Infrastructure Services - Application for Permit

modified COPAS equation for stormwater retention

Worked Example – Modified COPAS Equation for Stormwater Retention)

Schedule of Fees and Charges.