Check for excessive overland runoff flow through the embankment. Check for any sink hole D Signs of erosion, soil slide or development Y__ Basin bulges, seeps and wet spots, 1 Embankment loss of vegetation, or erosion on Direct the overland runoff to the N__ and Side Slopes the basin slope forebay or pretreatment area Restabilize the bank Work Order # __________ Clean and remove Y__ Trash or debris accumulation Determine source of trash and 1 more than 20% address to reduce future N__ maintenance costs or basin failure Trash rack is damaged or rusted Repair or replace trash rack greater than 50% Y__ 2 Work Order #__________ Trash rack is bent, loose, or N__ missing parts E Outlet Outlet components (e.g., orifice Y__ Repair or replace component 3 plates or weir plate) skewed, misaligned, or missing N__ Work Order #__________ Restabilize the discharge riprap Y__ Discharge pipe apron is eroded apron 4 or scoured N__ Work Order #__________ Standing water is present in the Y__ Pump out the standing water 5 outlet structure longer than 72 hours N__ Work Order # __________ Note:
D Basin Embankment and Side Slopes 1 Signs of erosion, soil slide or bulges, seeps and wet spots, loss of vegetation, or erosion on the basin slope Y__ N__ Check for excessive overland runoff flow through the embankment. Check for any sink hole development Direct the overland runoff to the forebay or pretreatment area Restabilize the bank Work Order # __________ E Outlet 1 Trash or debris accumulation more than 20% Y__ N__ Clean and remove Determine source of trash and address to reduce future maintenance costs or basin failure 2 Trash rack is damaged or rusted greater than 50% Trash rack is bent, loose, or missing parts Y__ N__ Repair or replace trash rack Work Order #__________ 3 Outlet components (e.g., orifice plates or weir plate) skewed, misaligned, or missing Y__ N__ Repair or replace component Work Order #__________ 4 Discharge pipe apron is eroded or scoured Y__ N__ Restabilize the discharge riprap apron Work Order #__________ 5 Standing water is present in the outlet structure longer than 72 hours Y__ N__ Pump out the standing water Work Order # __________ Note:
02-surface-extended-detention-basin-main-field-manual-april_2015.docx