Low Impact stormwater drainage charge

Businesses and Non-Residential Properties which have taken steps to reduce the impact of their stormwater drainage discharge can apply to Council for consideration of a discounted Low Impact stormwater drainage charge.  The Low Impact rate is equivalent to the minimum charge for Businesses and Non-Residential Properties.

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What does Council use the stormwater drainage charge for?

The stormwater drainage charges allow Council to sustainably manage its stormwater drainage network. The charges are used to fund the maintenance and replacement of existing stormwater drainage infrastructure as well as the construction of new stormwater drainage infrastructure as Council continues to expand its stormwater drainage network.

The stormwater drainage network provides a regional benefit to all community members. It ensures community infrastructure is protected, protects our natural assets, connects communities and supports access to work, recreation and critical services.

Who is eligible for a Low Impact stormwater drainage charge?

All Non-Residential Properties which have taken steps to reduce the impact of their stormwater discharge can apply to Council for consideration of the Low Impact rate. The Low Impact rate is $104.55 per year which is equivalent to the minimum charge for Businesses and Non-Residential Properties.

To be eligible for the discounted Low Impact stormwater drainage charge, the applicant must meet the set technical criteria, complete the appropriate application form and return the form with the required supporting documentation to Council for assessment.

How do you obtain approval for a Low Impact stormwater drainage charge?

A formal application must be made to Council that includes a completed copy of the Low Impact Stormwater Drainage Application Form. Council also requires the submission of appropriate documentation to support the application. The completed application form and supporting documentation can be submitted to Council by visiting one of Council’s Customer Service centres, via the post or preferably by emailing ask@centralcoast.nsw.gov.au.

Council will assess the application against the set technical criteria, review the supporting documentation and, where required, undertake inspections to verify the information provided.  A straightforward application will be processed within 15 working days.

What is the low impact stormwater drainage criteria and assessment process?

The Low Impact Stormwater Drainage Discount Process Map shows the process undertaken by Council for requests relating to the Low Impact stormwater drainage discount.

Council assesses applications received against the following set technical criteria:

CriteriaApplicationRequirementDocumentation

1. Drainage Connections

Mandatory for all Applicants.There are no illegal connections between the stormwater and sewerage systems.Certificate of compliance from a licenced plumber, confirming there are no illegal connections between the stormwater and sewerage systems

2. Property Details

Applicants who meet Criteria 1 and Criteria 2 are eligible for the Low Impact Property rate and are not required to meet Criteria 3.The percentage of pervious or natural area on the property is greater than or equal to 90% of the total property area.Property area, impervious area (roof area plus hardstand area) and natural area in square metres are mandatory fields in the Low Impact Property Application form. Council staff will perform desktop analyses and field checks to confirm the information provided.

3. Stormwater Management Measures:

3.1. Stormwater Detention and Retention Systems

3.2. Stormwater Treatment Systems

Applicants who meet Criteria 1 but do not meet Criteria 2 must achieve both Criteria 3.1 and Criteria 3.2 to be eligible for the Low Impact Property rate.The Stormwater Management Measures employed on the Property must:

3.1. Limit post development flows from the site to less than or equal to predevelopment flows for all storm events up to and including the 1% AEP storm event. Predevelopment site condition should be based on a vacant site with no impervious area. 50% of the volume of any Rainwater Tank can be claimed as part of the On Site Detention volume.

3.2. Achieve the following minimum reductions in total pollutant load when compared to untreated stormwater runoff from the Property:
• 80% reduction in Solids: suspended solids and gross pollutants (grit, sediment, leaves, grass clippings, litter)
• 45% reduction in Nutrients: Total Phosphorus and Total Nitrogen
A report prepared by a suitably qualified consultant confirming that the Stormwater Management Measures meet the Low Impact Property requirements. The report should include design details, hydraulic analyses, performance modelling and a statement confirming that the Measures are operational and regularly maintained. As a general guide:

3.1. DRAINS or an equivalent hydraulic model should be used to demonstrate Criteria 3.1 has been met.

3.2. MUSIC or an equivalent water quality model should be used to demonstrate Criteria 3.2 has been met.

OR

If the Stormwater Management Measures were conditions of development consent and have been approved by Council, the applicant must submit the Certified DA report, Occupancy Certificate and a statement confirming that the Measures remain operational and are regularly maintained.

Do Farmland properties need to apply for the Low Impact stormwater drainage charge?

No. Due to their homogenous nature and minimal impact on the stormwater drainage network, Farmland and certain other Non-Residential Property types have been automatically categorised as Low Impact. These properties do not need to apply to Council for the Low Impact rate. The criteria for the Low Impact Property by default is listed below:

  1. Properties categorised as ‘Farmland’ under s518 of the Local Government Act
  2. Properties categorised as ‘Business’ or ‘Mining’ under s518 of the Local Government Act that have at least 90% of the Property’s land area located within one of the following Local Environmental Plan Zonings
    • Recreational Zone
    • Environmental Protection Zone; or
    • Waterway Zone.

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Last updated : Mon 1 Jul 2019