Camden Council Stormwater & OSD Requirements: 2024 Guide

Building in Camden: Stormwater in Sydney’s Fastest-Growing LGA

Camden has been Australia’s fastest-growing local government area for much of the past decade. Oran Park, Gregory Hills, Leppington (south), Catherine Field, Spring Farm, Harrington Park, Narellan and Cobbitty are delivering new homes at extraordinary pace as the South West Growth Area builds out. For builders and developers, Camden Council’s assessment process is well-organised but firm – and stormwater documentation is checked closely on every residential application.

The Planning Controls That Govern Stormwater

The principal document is the Camden Development Control Plan 2019 (Camden DCP 2019), which contains general land use controls for water management alongside residential development controls. The DCP requires development to demonstrate compliance with Council’s Engineering Specifications – Camden’s engineering design and construction specifications – which carry the detailed technical criteria for detention, drainage and water sensitive urban design.

Land within Growth Centre precincts may also be subject to precinct-specific planning with its own water cycle strategies, so confirm exactly which controls apply to your lot before design begins.

What Camden Typically Requires for Residential Work

• On-site detention (OSD): where development increases impervious area beyond what the downstream system was designed for, OSD designed in accordance with Council’s Engineering Specifications is required. In master-planned precincts, some lots are covered by regional detention basins delivered with the subdivision – in which case lot-level OSD may not be needed. Verify your lot’s status rather than assuming either way.
• Stormwater drainage plans: a civil engineer’s drainage design showing the lawful point of discharge, pipework, levels and overland flow paths accompanies DAs for dwellings, dual occupancies and townhouses.
• WSUD and water quality: the DCP’s water management controls require water quality strategies for development-generated runoff. Council also encourages roof water collection in tanks for reuse, functioning as combined retention and detention.
• Battle-axe and constrained lots: the DCP specifically directs OSD for battle-axe blocks to be designed to the Engineering Specifications, and rear lots without street frontage commonly need inter-allotment drainage easements.

Greenfield Lots: Check What the Developer Already Built

In estates like Oran Park and Gregory Hills, much of the stormwater infrastructure – trunk drainage, basins, raingardens – was delivered by the land developer. Your job as a builder is usually to connect correctly: match the lot’s designated discharge point, respect any overland flow or drainage reserve on the lot, and comply with estate-specific requirements. Problems arise when dwellings are designed without checking the subdivision’s drainage strategy.

Local Factors in Camden

• Nepean River floodplain: the river runs through the LGA’s historic core, and land around Camden town and Spring Farm includes flood-affected areas with floor level and flood compatibility requirements.
• South Creek headwaters: much of the growth area drains north into the South Creek system, where cumulative catchment health drives Council’s water quality expectations.
• Flat clays and fill: Cumberland Plain clays with low permeability, plus extensive engineered fill in new estates, mean infiltration-based disposal is rarely acceptable and surface levels must be handled carefully against neighbouring lots.

How Builders Should Prepare

Obtain the lot’s subdivision drainage information and a detail survey before design, confirm whether OSD applies or has been provided regionally, and have a civil engineer prepare a drainage plan to Camden’s current Engineering Specifications. For duplexes and townhouses in older areas like Narellan and Elderslie, resolve the OSD concept and any easement requirements before lodgement to keep assessment on track.

Contrive Consultants prepares stormwater and OSD designs accepted by Camden Council across the South West Growth Area. Explore our services or contact us – call +61 497 848 111 or email info@contriveconsultants.com.au for a council-ready design.