March 10, 2026
DRAINS Modelling for Stormwater Design: ARR 2019, OSD & Pipes
How DRAINS models stormwater quantity for NSW projects - hydrology vs hydraulics, ARR 2019 ensembles, OSD sizing and pipe network analysis.
Read moreNews
Updates from Contrive Consultants.
March 3, 2026
Farm Dams, Drainage & Riparian Rules: NSW Landholder Guide
What NSW landholders can and can't do with farm dams, drainage lines and riparian land - harvestable rights, controlled activities and when…
Read more
February 17, 2026
Demolition, Erosion and Sediment Control: Protect Your NSW Site
Erosion and sediment control from demolition to slab in NSW - your ESCP, the Blue Book controls councils expect, and the fines…
Read more
February 10, 2026
Stormwater Requirements Across Regional NSW: Builder’s Guide
How stormwater and OSD requirements differ across regional NSW councils - Shoalhaven, Wagga Wagga, Dubbo, Tamworth and Albury - and how builders…
Read more
February 3, 2026
Small-Lot and Terrace Housing: Drainage for Compact Sydney Lots
Small-lot and terrace housing concentrates drainage risk. An engineer's guide to roof drainage, OSD, BASIX tanks and rear-lane lots on compact Sydney…
Read more
January 20, 2026
3D Visualisation for DAs and Pre-Sales: When Renders Pay Off
Where 3D visualisation earns its money on NSW projects - DA photomontages, design review, off-the-plan pre-sales - and when a render isn't…
Read more
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.
Read more
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…
Read more
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.
Read more
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…
Read more