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In cases where a stormdrain discharge into bioretention is considered, an upflow inlet can sometimes be applied. An upflow inlet allows the stormwater to enter the facility by surcharging (flowing upwards and "bubbling" up onto the surface) into the facility via a vertical standpipe. In these cases, the hydraulics of the up-gradient stormdrain system can play a critical role.
The above information was derived from the Prince George's County Bioretention Manual. Photo credit: T.E. Scott & Associates, Inc. |
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The flow entrance of a facility is an important
component of the bioretention. The best method of capturing and treating runoff
is to allow the water to sheetflow into the facility over grassed areas. This is
not always possible, especially where site constraints or space limitations
impede such an approach. A remedy to this problem is to provide flow entrances
that can reduce the velocity of the water. In the case of parking lot landscape
islands, curb cuts protected with energy dissipators such as landscape stone or
surge stone can be used. It is important to note that entrances of this type
will tend to become obstructed with sediment and trash that settles out at lower
velocities. This is not a problem as long as routine parking lot maintenance is
performed. The trapped sediment along the curbline provides a convenient
location for parking lot sweeping. On occasion, accumulated sediment and debris
should be removed from the flow entrance area if the accumulation is obstructing
flow into the facility itself.