How stormwater drains work and why they matter

When rain falls on Susanville, some water soaks into soil and landscaping. The rest travels across roofs, driveways, streets, sidewalks, and other hard surfaces. Stormwater drains provide a planned route for that runoff, helping move excess water away from homes, roads, and public facilities.

A drainage system is more than a grate beside the curb. It can include inlets, catch basins, underground pipes, open channels, culverts, detention areas, and natural waterways. Together, these features reduce localized flooding and help manage the flow of rain and snowmelt across the community.

From rainfall to runoff

Water begins its journey when precipitation reaches the ground. Vegetation, loose soil, and landscaped areas can absorb or slow some of it. Impervious surfaces, such as pavement and concrete, allow much less infiltration, so runoff gathers quickly and follows the slope of the land.

Street gutters guide this flow toward storm drain inlets. The openings are designed to admit water while keeping larger debris from entering the underground network. A basin below the grate may collect sediment, leaves, and litter before water continues through a pipe.

Stormwater systems are generally separate from sanitary sewer systems. Runoff usually receives little or no treatment before it reaches a channel, stream, or other discharge point, which makes preventing pollution at the source especially important.

What happens below the grate

A catch basin temporarily holds heavier material while water passes through an outlet pipe. Underground conduits then carry the flow toward a larger pipe, drainage channel, detention facility, or approved outfall. The system’s size and layout depend on factors such as rainfall intensity, watershed area, topography, and nearby development.

Some drainage features are visible, while others are buried or located within public rights-of-way. Maintenance crews inspect inlets, remove sediment and trash, repair damaged structures, and keep access points clear. Property owners also play a role by maintaining private drains, roof gutters, and driveway crossings on their property.

A blocked inlet can cause water to pond in the street or overflow into adjacent areas. During a storm, never remove a grate or enter a flooded roadway to clear debris. Report drainage concerns through the city’s Public Works resources so they can be directed to the appropriate staff.

Why drainage protects the community

Effective stormwater management helps keep streets passable, reduces erosion, and limits water damage to buildings and public infrastructure. It also helps preserve sidewalks, pavement, bridges, and landscaped areas by controlling where and how quickly runoff moves.

The benefits are especially important during intense rainfall, rapid snowmelt, or repeated storms. Drainage facilities must handle changing conditions without allowing water to collect near homes, intersections, utility infrastructure, or emergency access routes.

Drainage feature	Main function	Common concern
Curb inlet	Receives runoff from streets and gutters	Leaves, trash, and sediment blocking the opening
Catch basin	Captures heavier debris before water enters pipes	Accumulated sediment reducing capacity
Storm pipe	Conveys water underground	Cracks, root intrusion, or structural damage
Culvert	Carries water beneath a road or driveway	Debris blockage and erosion at the outlet
Detention area	Temporarily stores and releases runoff	Overgrowth, sediment, or inadequate drainage
Open channel	Moves water through a visible route	Bank erosion and litter accumulation

Water quality starts on the ground

Stormwater can pick up oil, automotive fluids, fertilizer, pesticides, pet waste, litter, and loose soil as it travels. Because that runoff may reach local waterways, small actions around homes and businesses can have a measurable effect on water quality.

Sweep driveways and sidewalks instead of washing debris into the street. Keep chemicals and waste covered, repair vehicle leaks, collect pet waste, and use fertilizer according to label directions. Washing paint, concrete residue, or other materials into a gutter can introduce pollutants directly into the drainage system.

Construction sites require particular care. Exposed soil can wash away during a storm, clouding waterways and filling catch basins with sediment. Properly placed erosion controls, stabilized entrances, and timely site cleanup help protect both private property and municipal infrastructure.

How residents can reduce flooding risks

Residents can support the drainage network by keeping the area around storm drain inlets free of leaves, branches, and household waste when conditions are safe. This does not mean lifting grates, reaching into basins, or working near moving traffic. Clear only surface debris from a safe location and report persistent blockages.

Homeowners should also inspect gutters, downspouts, retaining walls, driveway drains, and low points in yards. Direct roof drainage away from foundations without sending concentrated flow onto neighboring property or public sidewalks. During severe weather, secure loose items and monitor areas where water has collected in the past.

Useful habits include:

Sweep outdoor surfaces and dispose of debris properly.
Keep curb inlets and drainage paths visible and unobstructed.
Maintain private culverts, ditches, gutters, and downspouts.
Avoid dumping paint, oil, chemicals, or yard waste into streets.
Report flooding, damaged inlets, and unsafe roadway conditions promptly.

Planning for reliable public infrastructure

Stormwater planning is part of broader public works management. Engineers evaluate drainage patterns, pipe capacity, road grades, soil conditions, and future development when designing improvements. Projects may include replacing undersized culverts, improving an inlet, stabilizing an eroding channel, or adding a facility that temporarily stores runoff.

Residents can help by learning where water naturally flows around their property and by following permit requirements for work that affects streets, sidewalks, ditches, or public drainage facilities. Early coordination can prevent private improvements from blocking an established drainage route or shifting water onto another property.

Reliable service also depends on reporting accurate information. When contacting the city, include the location, type of problem, approximate time it began, and whether water is threatening a building or affecting traffic. Photos can be useful when they can be taken safely.

A clear stormwater route protects Susanville’s roads, properties, waterways, and neighborhoods. Keep drainage areas clean, use caution during storms, and report concerns through the City of Susanville Public Works Department so maintenance and emergency needs can receive timely attention.