#5 Non-clogging Low Flow Orifice
Provide a submerged, reverse-slope pipe, extending downward from the riser to a release point one foot below the normal pool elevation
Low flow orifice shall have a minimum internal diameter of 3 inches
Broad crested weirs, protected by a half-round CMP, extending at least 18 inches below the normal pool can also be used
Notes:
One of the most common maintenance and performance problems associated with ponds and wetlands is the clogging of the low flow orifice(s). There are several design specifications that can minimize the likelihood of clogging including reverse slope pipes and �hooded� outlets.