Expected performance benefits for various dewatering practices.
Link to this table
| |
Dewatering Best Management Practices |
| Sedimentation/ Settling Only (Sediment Traps/ Basins) |
Filtration Only (Silt Fence, Dewatering Bag, Geotextile, etc.) |
Pretreatment + Chemical Flocculants + Settling/Filtration ** |
| Water quantity |
|
| Flow attenuation |
Secondary benefit |
Little or no benefit |
Little or no benefit |
| Runoff volume reduction |
Secondary benefit |
Little or no benefit |
Little or no benefit |
| Water quality |
| Soil erosion |
Little or no benefit |
Little or no benefit |
Little or no benefit |
| Sediment control |
Primary benefit |
Primary benefit |
Primary benefit |
| Nutrient loading |
Secondary benefit |
Secondary benefit |
Secondary benefit |
| Pollutant removal |
| Total suspended solids |
Primary benefit |
Primary benefit |
Primary benefit |
| Total phosphorus |
Secondary benefit |
Secondary benefit |
Secondary benefit |
| Heavy metals |
Secondary benefit |
Secondary benefit |
Secondary benefit |
| Floatables |
Primary benefit* |
Little or no benefit |
Secondary benefit |
| Oil and grease |
Primary benefit* |
Little or no benefit |
Secondary benefit |
* If skimmer is used, otherwise secondary design benefit.
** Benefits depend on the pH and temperature of the water being treated.
