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Concentrated flow inlets are associated with LID practices such as [[Bioretention]], [[Stormwater planters]], [[Infiltration trenches]] and [[infiltration chambers|chambers]].
Sheet flow alternatives include [[level spreaders]], [[gravel diaphragms]] and [[vegetated filter strips]].
Practices such as [[permeable paving]] and [[green roofs]] receive precipitation directly, whilst [[exfiltration trenches]] are connected directly to conventional storm sewers.
Inlets for BMPs in the right of way should be located:
Inlets for BMPs in the right of way should be located:
*At all sag points in the gutter grade
*At all sag points in the gutter grade
*Immediately upgrade of median breaks, crosswalks, and street intersections.
*Immediately upgrade of median breaks, crosswalks, and street intersections.
It is good practice to have several inlets sized to split higher flow between a number of smaller BMPs or a along the length of a linear pratice ([[Overflow|Offline overflow]]).
It is good practice to have several inlets sized to split higher flow between a number of smaller BMPs or along the length of a linear pratice ([[Overflow|Offline overflow]]).
{| class="wikitable"
{| class="wikitable"
*Drains may be configured either perpendicular or parallel to the flow direction of the roadway, collecting runoff and directing to a single inlet in the BMP.
*Drains may be configured either perpendicular or parallel to the flow direction of the roadway, collecting runoff and directing to a single inlet in the BMP.
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*Inlet aprons or depressions increase inflow effectiveness of [[curb cuts]].
*Inlet aprons or depressions increase inflow effectiveness of curb cuts.
*Steeply angled aprons can be hazardous, especially to people bicycling. Curbside and protected bike lanes along concrete aprons should be at least 1.8 m to give cyclists adequate clear width from the curb and any pavement seams. Aprons can also be marked visually to indicate their perimeter.
*Steeply angled aprons can be hazardous, especially to people bicycling. Curbside and protected bike lanes along concrete aprons should be at least 1.8 m to give cyclists adequate clear width from the curb and any pavement seams. Aprons can also be marked visually to indicate their perimeter.
*For aprons into [[bioretention]], the curb may angle into the cell to improve conveyance of gutter flow into the facility. Aprons typically drop 50 mm into the bioretention cell, with another 50 mm drop behind the curb to maintain inflow as debris collects.
*For aprons into [[bioretention]], the curb may angle into the cell to improve conveyance of gutter flow into the facility. Aprons typically drop 50 mm into the bioretention cell, with another 50 mm drop behind the curb to maintain inflow as debris collects.
*An inlet sump is recommended to settle and separate sediment from runoff where a large amount of debris is expected.
*An inlet sump is recommended to settle and separate sediment from runoff where a large amount of debris is expected.
*Water drains into a catch basin, where debris settles in its sump. After [[pretreatment]], water drains via a pipe or opening into the BMP.
*Water drains into a catch basin, where debris settles in its sump. After [[pretreatment]], water drains via a pipe or opening into the BMP.
*The sump can be directly connected to a perforated [[underdrain]] pipe to distribute the flow to the [[bioretention]] or connected [[extended tree pits|tree pits]].
*The sump can be directly connected to a perforated [[underdrain]] pipe to distribute the flow to the [[bioretention]], supported [[soil cells]] or underground practices such a [[trenches]] or [[chambers]] .
*Sump inlets should not be sited where pedestrians will have to negotiate with them.
*Sump inlets should not be sited where pedestrians will have to negotiate with them.
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|style="vertical-align: top;"|{{:Curb cuts: Gallery}}
|style="vertical-align: top;"|{{:Curb cuts: Gallery}}
|style="vertical-align: top;"|{{:Inlet sumps: Gallery}}
|style="vertical-align: top;"|{{:Inlet sumps: Gallery}}
|style="vertical-align: top;"|{{Depressed drains: Gallery}}
|style="vertical-align: top;"|{{:Depressed drains: Gallery}}
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|}
==External links==
==External links==
https://nacto.org/publication/urban-street-stormwater-guide/stormwater-elements/bioretention-design-considerations/inlet-design/
https://nacto.org/publication/urban-street-stormwater-guide/stormwater-elements/bioretention-design-considerations/inlet-design/