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Flow control and green areas go hand in hand
Flow control of drainage is increasingly common. This is evidenced by many developments in residential areas which are unable to manage runoff water from new plots.
In many locations, the flow coefficient for an area rises solely due to carport extensions, glassed-in patios and flagstone pavements.
The increased water volumes are often attenuated by open basins which are part of green areas. The flow from here is controlled by a flow regulator. This prevents flooding elsewhere downstream in the sewer system.
Even if only houses and streets are built and laid in a residential area, large volumes of rainwater must be diverted. If pavements, bicycle trails, carports, etc., as well as vast flagstone areas are added to this, even more water will need to be diverted.
Open basins are adapted to the terrain to look like small lakes, and vegetation is planted around them, giving the new residential area one or more green oases.
Many municipalities install a Mosbaek flow regulator in a 1.25-metre inspection shaft at the drainage from such a small lake.
The flow regulator controls the runoff and requires only minor maintenance. This prevents flooding elsewhere downstream in the sewer system.