January 13, 2026
Canterbury-Bankstown Stormwater & OSD Requirements Guide
Canterbury-Bankstown DCP 2023 stormwater and OSD requirements — what duplex and townhouse builders in Bankstown and Campsie need before lodging.
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Updates from Contrive Consultants.
December 16, 2025
Dual Occupancy Stormwater: Duplex Design in Western Sydney
What a duplex stormwater package really involves in Western Sydney — OSD, easements, clay soils, subdivision traps and what certifiers check at…
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December 9, 2025
Maintaining Your OSD System: A Post-Handover Guide
OSD obligations don't end at handover. What owners, strata schemes and builders must do to keep detention systems compliant and working.
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December 2, 2025
Bushfire-Prone Land: APZs, Access & Water for Rural Builds
What PBP 2019 means for rural builds in NSW — asset protection zones, access roads, static water supply and how civil design…
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November 18, 2025
Retaining Wall Approvals in NSW: Exempt, CDC or DA?
When a NSW retaining wall needs no approval, a CDC or a full DA — height thresholds, boundary rules, drainage duties and…
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November 11, 2025
Rainwater Tanks and BASIX: Integrating Roof Drainage in NSW
How to integrate BASIX rainwater tank commitments with roof drainage design on NSW new homes — connected roof area, overflows and certification.
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November 4, 2025
Flood-Affected Land in Growth Areas: Reading Flood Mapping
How builders and developers can read flood mapping in Sydney's growth areas — AEP, freeboard, flood functions and what to check before…
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October 21, 2025
Landscape Plans for DAs: What Councils Assess and the WSUD Link
What NSW councils assess in DA landscape plans — landscaped area, deep soil, canopy, species — and how good landscape design integrates…
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October 14, 2025
MUSIC Modelling Explained: Council Stormwater Compliance
How MUSIC modelling demonstrates stormwater quality compliance to NSW councils — pollutant targets, source nodes, treatment nodes and MUSIC-link.
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September 16, 2025
Stormwater Quality Targets in Sydney: MUSIC Modelling Explained
What Sydney councils' pollutant reduction targets mean, when a DA needs MUSIC modelling, and how engineers build treatment trains that pass review.
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