May 16, 2023
Triplex & Multi-Dwelling Roof Drainage: When You Need an Engineer
When triplexes and multi-dwelling housing in NSW need a hydraulic engineer's stormwater plan - and what councils and certifiers expect in the…
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Updates from Contrive Consultants.
April 11, 2023
GPTs and Pit Inserts: Where the SPEL Stormsack Fits
How gross pollutant traps and pit inserts like the SPEL Stormsack work, what they remove, and where they belong in a NSW…
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March 14, 2023
Ku-ring-gai Council Stormwater & Drainage Requirements
How Ku-ring-gai Council assesses stormwater, OSD and drainage for new homes and duplexes - and why tree-sensitive design matters in this leafy…
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February 14, 2023
Hawkesbury Council Stormwater & Flood Requirements Guide
Stormwater and flood-prone land requirements in the Hawkesbury LGA - what builders in Windsor, Pitt Town and Vineyard need before lodging a…
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January 17, 2023
When Do You Need OSD in Sydney? Triggers by Development Type
New dwelling, duplex, granny flat or commercial build - when do Sydney councils require on-site detention? The common triggers explained.
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December 6, 2022
Duplex Stormwater & Roof Drainage Plans in Sydney: Dual Occupancy
Dual occupancy stormwater requirements explained - shared drainage, easements, detention and roof drainage plans certifiers expect for Sydney duplexes.
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November 8, 2022
Rain Gardens & Bioretention Basins: NSW Design Fundamentals
Design fundamentals for rain gardens and bioretention basins in NSW: filter media specs, plant selection, sizing logic and common approval pitfalls.
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October 11, 2022
Hornsby Shire Council Stormwater Requirements for Builders
A builder's guide to Hornsby Shire Council stormwater and OSD requirements under the Hornsby DCP 2013, including bushland and sandstone site factors.
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September 13, 2022
Hills Shire Stormwater & OSD Requirements: A Builder’s Guide
How The Hills Shire Council assesses stormwater and OSD under DCP 2012 - what builders in Box Hill, North Kellyville and Rouse…
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August 9, 2022
OSD Tank Options Compared: Concrete Tanks, Basins & Pipes
Below-ground concrete tanks, above-ground basins or pipe storage? We compare OSD options on cost, site suitability and council approval.
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