Finding the Right Stormwater Drainage Map for Your Property

A stormwater drainage map shows how rainwater moves across a property and connects with public infrastructure. It may identify roof downpipes, private drains, pits, swales, culverts, kerb inlets, easements and the point where runoff leaves the site. Finding the correct plan is useful before landscaping, extending a driveway, replacing paving or investigating localised flooding.

Records are held by different organisations, so the quickest approach is to identify the type of map you need first. A council drainage plan may show public pipes and inlets, while a building or engineering file may contain the private site layout. For properties in Susanville, the Public Works website is a sensible starting point for municipal infrastructure information, utility contacts and service guidance.

Identify The Drainage Information You Need

Start by deciding whether you need a public stormwater network map, a private property drainage plan or a broader flood and catchment map. A public network map can show mains, culverts, outfalls and drainage reserves. A private plan is more likely to show where water travels within your lot, including underground pipes and connections.

Search your property documents for terms such as “stormwater drainage plan”, “site drainage plan”, “drainage layout”, “as-constructed drawing”, “civil plan” or “stormwater management plan”. Older files may use “surface water”, “run-off”, “drainage easement” or “hydraulic plan” instead.

In Australia, the equivalent record may sit with your local council, a state land-records office, a developer or a private surveyor. Kerb and gutter systems, roadside table drains and drainage easements are common features to check. In parts of Queensland or the Northern Territory, intense wet-season rainfall makes overland flow paths especially important, even when they are not shown as underground pipes.

Check Council And Property Records

Contact the council or public works department responsible for the address and ask which department holds drainage records. In Susanville, the municipal Public Works Department covers streets, stormwater and related infrastructure, so its service information may help direct a records request. Have the street address, parcel number, owner details and a clear description of the proposed work ready.

A council may provide a GIS utility viewer, scanned engineering drawings, subdivision plans or records from a development application. Some documents are available online; others require an in-person request, an administrative fee or proof of ownership. Ask whether the map is indicative or surveyed, and confirm the date and scale before relying on it.

Australian councils often distinguish between a public asset and a private connection. A council map may stop at the property boundary, while the owner remains responsible for pipes, pits and drains within the block. In a typical suburban street around Melbourne, Adelaide or Perth, the legal drainage point may be a kerb outlet or council pit rather than a direct connection to a large underground main.

Use Plans, Titles And On-Site Clues

Review the property title, deposited plan, subdivision documents and previous building approvals for drainage easements. An easement may run along a side boundary or through the rear of a lot, and it can restrict structures, retaining walls or substantial landscaping. The title plan may show the easement but not the pipe’s exact depth, condition or route.

Building approvals and civil drawings can reveal details that a general council map does not. Look for invert levels, pipe diameters, pit numbers, finished ground levels, flow arrows and connection points. If the property has changed hands or been renovated, compare several plans because an older drawing may no longer reflect the current layout.

Walk the site during or after rainfall, without entering pits or opening covers. Note low points, ponding, grated inlets, downpipes, overflow paths and areas where water crosses the driveway. In Australia, a “stormwater pit” may be called an inlet, gully or drain, while a shallow grassed channel may be described as a swale or table drain.

Verify The Map Before Any Work

A drainage map is a planning aid, not proof that every pipe is correctly located. Private lines may have been altered without updated drawings, and older plans can contain approximate alignments. A licensed surveyor, civil engineer or drainage contractor can use surface levels, inspection equipment and non-destructive locating methods to verify the route.

Before excavating, use the appropriate underground service enquiry system. In Australia, Before You Dig Australia can identify registered underground assets, but it does not replace a search for private stormwater pipes. The same principle applies in Susanville: public utility records may not include every privately installed service or drainage connection.

Construction near a footpath, road reserve or public drain may require approvals, traffic controls or a temporary barricade. Guidance on construction site permits can help clarify the process when work affects a public area. Keep the approved plan, locating results and contractor notes together for future maintenance.

Keep A Usable Drainage Record

Once the route is confirmed, create a simple property drainage file. Save the original plan, a marked-up copy, photos of visible pits and the date each feature was checked. Add measurements from fixed points such as building corners or boundary markers so a future owner or contractor can interpret the drawing.

Use clear labels for private pipes, council assets, easements and uncertain features. Mark the direction of flow and identify where overflow is intended to travel during a major storm. This matters in areas where short, intense rainfall can exceed the capacity of the underground network.

Records Worth Gathering

• Property title and deposited plan
• Building approval and drainage drawings
• Council stormwater or GIS records
• Surveyor or contractor locating report

Details To Verify On Site

• Pipe routes, pits and grated inlets
• Easements and public drainage connections
• Surface levels and overland flow paths
• The date and accuracy of each plan

A clear drainage map supports safer decisions about paving, extensions, fencing and landscaping. It also helps distinguish a maintenance issue on private land from a problem involving a council asset, road reserve or shared drainage easement.