What is a Storm Sewer?
A storm sewer is an underground drainage system that collects and conveys rainwater and surface runoff away from roads, buildings, and other developed areas.
Definition
Purpose
Storm sewers manage runoff and reduce flooding in developed areas.
- Runoff Collection: Captures rainwater from streets, roofs and paved surfaces.
- Flood Prevention: Helps reduce surface water accumulation.
- Site Drainage: Directs runoff away from buildings & infrastructure.
- Erosion Control: Helps manage water flow & reduce erosion risks.
- Infrastructure Protection: Reduces water-related damage to roads and surrounding areas.
- Material Estimation: Helps contractors calculate pipe lengths, fittings and drainage structures.
Examples of Use
- Roadways: Collects runoff through roadside inlets & catch basins.
- Commercial Sites: Drains parking lots and paved areas.
- Residential Developments: Manages runoff from streets & properties.
- Industrial Facilities: Directs stormwater from yards & paved surfaces.
- Municipal Projects: Connects drainage infrastructure to approved stormwater systems.
Notes
- Storm sewer systems may use reinforced concrete, PVC, HDPE or other specified pipe materials.
- Takeoffs typically use civil, grading, utility and drainage plans.
- Estimates may include pipes, fittings, inlets, manholes, catch basins and excavation.
- Pipe diameter, slope, invert elevations and connection details affect installation requirements.
- Bedding, backfill, trenching and restoration may contribute to project costs.
- Storm sewers are generally separate from sanitary sewer systems.
- Accurate takeoffs help prevent quantity omissions and improve bid reliability.
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