When heavy rain hits streets, driveways, parking lots, and rooftops, water needs somewhere to go. Here, we can understand the role of a drain, particularly for homeowners. These drainage systems collect excess rainwater and direct it away from roads, buildings, and other areas where standing water could cause flooding or property damage.
In this guide, you will learn what a storm drain is, how it works, where the water goes, what can cause blockages, and how proper maintenance can keep the system functioning effectively.
What Is a Storm Drain?
The role of a drain is to serve as an inlet for collecting surface runoff or rainwater. Generally, they are designed along streets, in parking lots, and surrounding paved areas. Some modern systems are capable of collecting water from rooftops and other surfaces.
Unlike a household drain, a storm drain is designed primarily to handle rainwater and runoff rather than wastewater from sinks, toilets, showers, or washing machines.
When rain falls on natural ground, much of the water can soak into the soil. Roads, sidewalks, concrete, and other hard surfaces prevent much of that infiltration, causing water to flow across the surface instead. Storm drains help collect this runoff and move it through a drainage network.
How Does a Storm Drain Work?
1. Rainwater collects on surfaces
Water gets stuck on roads, sidewalks, driveways, roofs, and parking areas during heavy rainfall. These surfaces contain little soil to absorb water. Water starts moving downhill as runoff.
The amount of runoff can increase significantly in developed areas because paved surfaces prevent water from naturally soaking into the ground.
2. Runoff flows toward an inlet
The design of streets and paved areas generally directs water toward low points. These areas may contain grated openings that allow runoff to enter the drainage system.
Professionals use grates to prevent water from entering underground pipes.
3. Water enters underground pipes
The drainage structure is designed with a network of pipes, channels, and other fixtures. Once water passes through the inlet, the drainage network catches it. These components transport the water away from the collection point.
Depending on the local system, the drainage network may include several connected inlets, underground conduits, open channels, detention structures, or other stormwater controls.
4. Water is discharged
The collected water eventually moves toward a designated discharge point. In many communities, stormwater systems discharge into streams, rivers, lakes, or other receiving waters.
It is important to understand that stormwater does not necessarily receive the same treatment as wastewater entering a sanitary sewer. In separate sewer systems, stormwater and sanitary wastewater are carried through different systems.
What Is the Difference Between a Storm Drain and a Sewer Drain?
The terms can sound similar, but storm drains and sewer drains serve different purposes.
A storm drain collects rainwater and surface runoff. A sanitary sewer carries wastewater from toilets, sinks, showers, appliances, and other household fixtures to a wastewater treatment facility.
A storm drain is therefore part of a stormwater management system, while a household sewer drain is part of a sanitary plumbing system.
There are also combined sewer systems in some older communities. These systems carry stormwater and wastewater through the same pipes. During heavy rainfall, they can experience overflows when the volume entering the system exceeds its capacity.
What Can Cause a Storm Drain to Clog?
Storm drains are exposed to outdoor conditions, so debris can enter them easily. Leaves, grass, dirt, sediment, litter, and other materials can accumulate around the grate or farther inside the drainage system.
Water flow is generally restricted by any buildup inside the pipes. According to EPA guidelines, a poorly maintained system accumulates debris and pollutants over time. It usually results in clogging, flooding, and other serious problems related to water quality.
Common causes include:
- Leaves and branches
- Dirt and sediment
- Trash and plastic
- Grass clippings
- Mud and soil
- Oil and grease
- Other outdoor debris
Tree roots can also become a concern when they enter damaged or compromised underground pipes.
Signs Your Storm Drain May Have a Problem
A drainage issue is not always obvious when the weather is dry. Problems often become noticeable during or shortly after heavy rainfall.
Watch for:
- Standing water: Water that remains around a drain after nearby areas have started drying may indicate restricted flow.
- Slow drainage: If water takes unusually long to disappear, there may be debris or another obstruction somewhere in the system.
- Overflowing water: Water flowing around or over the grate instead of entering it can indicate that the inlet or downstream pipe cannot handle the flow.
- Recurring flooding: Frequent pooling in the same area after rain should not be ignored.
- Unpleasant odors: Organic debris and stagnant water can contribute to unpleasant smells around drainage areas.
If you notice recurring drainage problems, professional sewer and drain cleaning services can help identify whether the problem is a simple blockage or a more serious issue affecting the underground line.
Why Storm Drain Maintenance Matters
Regular drainage system maintenance keeps them effective. They can handle heavy to moderate rainfall. Cleaning the debris and dirt from the system can help manage heavy storms.
Maintenance typically involves some important steps. It includes component verification, removing debris, checking flow, and addressing damaged sections. In this situation, DIY attempts are usually a failure. All you need is a professional intervention to manage the situation and understand the significance of regular maintenance.
For certain plumbing and drainage blockages, hydro jetting uses high-pressure water to remove buildup from the inside of pipes. The right cleaning method depends on the condition and type of pipe, so an inspection should come before aggressive cleaning.
How Can You Help Prevent Storm Drain Problems?
Homeowners and businesses can reduce the amount of debris entering drainage systems with a few simple habits.
Keep leaves, grass clippings, and loose soil away from drain openings. Do not sweep yard debris into a street or drain. Dispose of oil, paint, chemicals, and other pollutants properly rather than allowing them to enter stormwater systems.
This matters because runoff can pick up pollutants from roads, lawns, parking areas, and other surfaces before carrying them into drainage systems and, in some cases, nearby waterways.
When Should You Call a Professional?
You can use your hands to clean surface debris often. However, persistent water clogging demands professional intervention. You need expert guidance to manage repeated blockage or suspected underground damage.
If the problem involves a connected sewer or drain line, a professional plumber can inspect the system and determine whether it needs cleaning, snaking, hydro jetting, repair, or another solution. White Plumbing Company provides residential sewer and drain services in Springfield and surrounding areas, including drain cleaning, cable snaking, hydro jetting, and sewer line work.
Final Thoughts
Storm drains play a significant role in managing rainwater. From collection of runoff to proper drainage, they serve as an appropriate discharge point.
Keeping drainage openings clear and addressing recurring problems early can reduce the risk of localized flooding and costly damage. More importantly, understanding how these systems work helps homeowners recognize potential drainage issues before a heavy storm turns a minor blockage into a major problem.
