Stormwater Management Plans
The core drawing set councils ask for at DA, CDC or CC. We design the whole system, not just the pipes.
What you receive
Stormwater Management Plan drawing set — site plan, roof plan, details & notes
Drainage calculations and design report
Hydraulic Grade Line analysis
Council DCP compliance summary
Amended plans in response to any council RFI
How we do it
Pipe and pit network sizing in DRAINS (Watercom), other methods, to Council requirements.
Lawful point of discharge assessment — kerb and gutter, charged line, absorption or infiltration trench, dispersion trench, level spreader, or proprietary system
Roof, planter box, podium and balcony drainage
Sump and pump systems where gravity discharge isn't available
Surcharge, backflow and overland flow path assessment
Integration of on-site detention, rainwater reuse and water quality treatment
Documented in Autodesk Civil 3D to AS3500.3 and council specifications
When you need it
Almost every DA, CDC and CC in NSW — alterations and additions, new dwellings, secondary dwellings, dual occupancy, multi-unit, subdivision, commercial and industrial development.
If your consent carries a stormwater condition, or your certifier has asked for a drainage design, this is the document.
Related services On-Site Detention · Water Sensitive Urban Design · Hydrology Assessment
Frequently Asked Questions
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Typically 2–4 weeks from receipt of architectural plans and survey.
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Architectural plans, a detail survey, and the site address. Send your DA consent or CDC if you have one.
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Yes. We speak to council engineers one-to-one when a design needs to be negotiated.