Stormwater Basics


Stormwater Runoff:   Storm water runoff is generated when rain and snow melt flows over land or impervious surfaces, such as streets and parking lots, and does not soak into the ground.  Runoff picks up trash, chemicals, oils, sediment and other pollutants that can harm our rivers, lakes, streams and coastal waters if discharged into the environment without first being treated.

Keeping Our Waters Clean and Safe:   Control and treatment of stormwater runoff was mandated by the Clean Water Act in 1972. The National Pollutant Discharge Elimination System (NPDES) program requires businesses, states, and municipalities to have programs, practices, and infrastructure in place to control the discharge of pollutants in stormwater.

Stormwater Management:   Controlling and treating runoff lessens the impact that development has on nearby waters.  The vast array of  facilities employed in the management of stormwater can be divided into two broad categories: Above Ground and Below Ground. Above Ground methods include detention, retention, bioretention and filtration basins, swales, pervious pavement, trash racks, low flow channels, rip-rap outfall protection and so on.  Below Ground facilities are usually unseen and include  pipe storage systems, oil/water separators, sand filters, vaults, and specialized water quality units for separating, filtering, or storing stormwater.

Stormwater Facilities Maintenance:   Routine maintenance improves aesthetics, ensures stormwater facilities and free of debris and sediment and functioning correctly, and avoids the costly remediation of a system in disrepair. HILAND CONSTRUCTION SERVICES can provide facilities maintenance including:

  •  Vegetation management
  • Slope, embankment & outlet stabilization
  • Trash, debris & leaf litter control
  • Sediment removal
  • Service of mechanical components
  • Clearing filters & screens of sediment, debris & floatable materials
  • Replacement of filter media when necessary
  • Repairing damage to inlets, storm manholes, trench drains, channel linings, outlet control structures and outfall protection ie. rip-rap/gabion mattresses

Stormwater Maintenance