Section 7 - Sediment Control Flashcards
Sediment Control First Line of Defense
directing and managing runoff and stabilizing soil
Sediment Control Second Line of Defense
sediment control
Specific Sediment control measure
traps, basins, silt fence, stabilized construction entrances, protection of storm drain inlets, road stabilization, water structures, turbidity curtains, jersey barriers, portable dames and containment structures.
Capture devices
silt fence, sediment traps, sediment basins. Proper
Capture devices best performing generally perform at ____ efficiency, but is dependant on _______and amount of ____.
90%, particle size, time
Sediment Traps are
set in path of sediment laden flow
Traps generally sized for larger (5 acres +) or smaller areas (5 acres or less)
Smaller. 10yr, 24 hr storm, and 3,00 cf per acre
Remove sediment when efficacy is reduced by ____%.
50
Active Treatment Systems (ATS)-
safe and effective methods for removing sediment from stormwater runoff. chemical process
Flow-through ATS systems can treat far greater quantities of stormwater runoff in much shorter period of time then settling processes and can be used as a substitute. T/F
F-cannot be used as a substitute
ATS should/ should not be equipped with inline pH and turbidity sensors
should
ATS Flow through systems have a loop that_____ until ______is reached
recirulates, water quality
Storm Water Regulations protect impacts to _______, ______, and ______.
sediment, turbitity, other pollutents
Turbidity
a measure of the amount of material suspended in the water. Increasing the turbidity of the water decreases the amount of light that penetreates the water column. High levels of turbitity are harmful to equatic life.
