Three‑Waters & Civil Coordination
Practical stormwater, wastewater, and water-supply solutions—designed to pass approvals and keep your programme moving.
Built for Auckland developers, builders, and landowners.
Worried about three-waters roadblocks?
Unsure what Council expects for detention/retention, soakage, or overland flow paths?
Not clear if the public network has capacity—or whether a pump station or upgrade is likely?
Concerned that accessway grades, service conflicts, or RFIs will blow out time and budget?
Three-waters in Auckland is complex. A compliant design must align with catchment rules and flood hazards, manage primary/secondary flows, prove wastewater capacity, and confirm water-supply pressure and fire-fighting requirements—often alongside accessway and civil works. Getting the sequence right matters: desktop checks → options testing (soakage vs discharge) → calcs and drawings → Engineering Approval and conditions.
Every site behaves differently. Impervious area, soil soakage, flood levels, pipe depths/grades, and network capacity drive cost and timing. Across concept → approvals → construction → as-builts, each step can trigger redesigns if not coordinated.
My Subdivision makes it clear. We map the hydraulics, choose the right system (raingardens, tanks, soakage, pipework), coordinate civil interfaces (accessways, crossings, utilities), and assemble an approval-ready pack—so you avoid rework and stay on programme.
What We Check
Hydraulics & Civil Interfaces
- Stormwater: catchment context, impervious area, OLFP/flood hazards, soakage feasibility, detention/retention sizing, treatment (WSUD/low-impact devices), primary & secondary flow paths.
- Wastewater: depth/grade to connect, capacity checks, private vs public upgrades, pump station triggers, easements and approvals.
- Water supply: pressure/flow, meter sizing, backflow, hydrant coverage (fire-fighting considerations).
- Civil coordination: accessway gradients, vehicle tracking/sightlines, services corridors, conflicts/clearances, driveway drainage.
- Approvals & conditions: Engineering Approval requirements, pre-app value, likely consent conditions, as-built and operations/maintenance expectations.
How It Works
(Process & Timing)
Kickoff & Data
Site address/LIM, concept, goals; check overlays, hazards, network data, and survey/topo
Options Testing
Soakage vs discharge; detention vs retention; device selection and footprint impacts
Calcs & Design
Hydrology, pipe grades, long-sections, accessway drainage, conflicts resolution
Pre-app
Targeted questions to de-risk (capacity, OLFP, device acceptability)
Approval Pack
Drawings + report assembled to local standards; submit and manage RFIs.
Construction Handover
Conditions matrix, inspection/testing plan, as-built requirements.
We keep you updated with a simple cadence: weekly status, action list, and risks-on-radar…
Frequently Asked Questions
Do I need detention if I have soakage?
Often you’ll need to prove soakage rates; where soakage is limited or variable, combined approaches (partial detention + treatment) can be required.
What if the OLFP crosses my site?
We’ll preserve/route secondary flow with levels and overland paths that protect buildings and neighbours—this is a common approval focus.
Can you work with our existing civil engineer/architect?
Yes. We coordinate with your team or recommend trusted Auckland specialists.
When should we start three-waters design?
Early—before you lock architecture and access levels. Early hydraulics save redesigns later.
Is Engineering Approval always required?
It depends on scope and whether assets are public or private; we’ll advise the correct pathway and documentation.
