Page 165 - California Stormwater Workshop Handouts

ATTACHMENT C

GLOSSARY

Qualifying Storm Event (QSE)
A precipitation event that:

a. Produces a discharge for at least one drainage area; and
b. Is preceded by 48 hours with no discharge from any drainage area.

Regional Water Board
Includes the Executive Officer and delegated Regional Water Board staff.

Runoff Control BMPs
Measures used to divert run-on from offsite and runoff within the site.

Run-on

Discharges that originate offsite and flow onto the property of a separate facility or
property or, discharges that originate onsite from areas not related to industrial activities
and flow onto areas on the property with industrial activity.

Scheduled Facility Operating Hours

The time periods when the facility is staffed to conduct any function related to industrial
activity, but excluding time periods where only routine maintenance, emergency
response, security, and/or janitorial services are performed.

Sediment

Solid particulate matter, both mineral and organic, that is in suspension, is being
transported, or has been moved from its origin by air, water, gravity, or ice and has
come to rest on the earth's surface either above or below sea level.

Sedimentation

Process of deposition of suspended matter carried by water, wastewater, or other
liquids that flow by gravity. Control of sedimentation is accomplished by reducing the
velocity of the liquid below the point at which it can transport the suspended material.

Sediment Control BMPs

Practices that trap soil particles after they have been eroded by rain, flowing water, or
wind. Includes those practices that intercept and slow or detain the flow of storm water
to allow sediment to settle and be trapped (i.e., silt fence, sediment basin, fiber rolls,
etc.).

Sheet Flow

Flow of water that occurs overland in areas where there are no defined channels and
where the water spreads out over a large area at a uniform depth.

Source

Any facility or building, property, road, or area that causes or contributes to pollutants in
storm water.

Order 2014-0057-DWQ 6