Visual Aid for Dry Type Stormwater Basin Inspection (Note: Basins shown here include various types of dry basins, not limited to the category of basin in this field manual.) Issue: The inlet is not properly drained, assuming it has not rained within 72 hours. Corrective Action: Clear and remove sediment. Check whether the water table is at or above the bottom of the forebay. Also check the permeability of the underlying soil, if necessary. Preventative Action: Routine inspections and removal of sediment from the forebay. Issue: The Inflow pipe is clogged by sediment and vegetation. Corrective Action: Clear and remove sediment and unwanted vegetation. Preventative Action: Routine inspection and removal of sediment and unwanted vegetation. Issue: The Inflow pipe is entirely clogged by sediment and trees. Corrective Action: Clear and remove sediment and trees. Preventative Action: Routine inspection & removal of sediment and unwanted vegetation. Issue: The excessive sediment in inflow pipe (shown above) might be caused by a blockage of flow to the basin due to excessive vegetation and overgrown trees. Corrective Action: Clear and remove trees and vegetation. If necessary, re-grade the bottom slope to ensure the flow properly spreads over the basin bottom. Preventative Action: Routine inspection and removal of sediment and unwanted
Visual Aid for Dry Type Stormwater Basin Inspection (Note: Basins shown here include various types of dry basins, not limited to the category of basin in this field manual.) Issue: Corrective Action: Preventative Action: The inlet is not properly drained, assuming it has not rained within 72 hours. Clear and remove sediment. Check whether the water table is at or above the bottom of the forebay. Also check the permeability of the underlying soil, if necessary. Routine inspections and removal of sediment from the forebay. Issue: Corrective Action: Preventative Action: The Inflow pipe is clogged by sediment and vegetation. Clear and remove sediment and unwanted vegetation. Routine inspection and removal of sediment and unwanted vegetation. Issue: Corrective Action: Preventative Action: The Inflow pipe is entirely clogged by sediment and trees. Clear and remove sediment and trees. Routine inspection & removal of sediment and unwanted vegetation. Issue: Corrective Action: Preventative Action: The excessive sediment in inflow pipe (shown above) might be caused by a blockage of flow to the basin due to excessive vegetation and overgrown trees. Clear and remove trees and vegetation. If necessary, re-grade the bottom slope to ensure the flow properly spreads over the basin bottom. Routine inspection and removal of sediment and unwanted