BMP Monitoring Sites - Urban Drainage and Flood Control District

UDFCD BMP MONITORING SITES
Orchard Pond EDB
overflows should be designed in accordance with local
drainage criteria and should consider UDFCD dropstructure
design guidelines or the use of buried soil riprap
or reinforced turf mats installed per manufacturer
recommendations.
Vegetation
Access
Inlet
Forebay Design
Bottom vegetation provides erosion control and sediment
entrapment. Pond bottom, berms and side sloping areas
may be planted with native grasses or irrigated
turf, depending on the local setting and needs.
All-weather, stable access to the bottom, forebay and
outlet works area shall be provided for maintenance
vehicles. Grades should not exceed 10 percent, and a
solid driving surface of gravel, rock, concrete,
gravel-stabilized turf, or Type VL soil riprap should be
provided.
Dissipate flow energy at
pond’s inflow point(s) to
limit erosion and promote
particle sedimentation.
Inlets should be designed
in accordance with UDFCD
drop structure criteria,
impact basin outlet details
or other types of energy
dissipating structures.
Provide an opportunity for larger particles to settle out in
the inlet in an area that has a solid surface bottom to
facilitate mechanical sediment removal. A rock berm or
concrete wall should be constructed between the forebay
and the main extended detention basin.
The forebay volume of the permanent
pool should be about 3 to 5% of the
WQCV. A pipe throughout the berm to
convey water the main body of the basin
should be offset from the inflow
streamline to prevent short circuiting and
should be sized to drain the forebay
volume in 3 to 5 minutes, respectively.
The floor of the forebay should be
concrete or grouted boulder lined to define sediment
removal limits.