Flood protection Nöthnitzbach Small stormwater overflow basins to protect the urban area of Dresden

Accumulation 2012 © 2012 Christoph Hein

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Land use before the start of the measure : Riding arena artificially raised by sand backfilling © 2006 Christoph Hein

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Land use before the measure: riding arena © 2007 Christoph Hein

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Building operations 2010 © 2010 Christoph Hein

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Building operations 2010 © 2010 Christoph Hein

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accidental flooding during construction © 2010 Christoph Hein

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Drainage of the unintentional inflowing water over the outlet sill during the construction phase © 2010 Christoph Hein

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Basin with completed greening in the first vegetation period © 2011 Christoph Hein

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extensive alder sprouting © 2011 Christoph Hein

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Overflow sill between basin 2 and basin 3 with extensive fastening © 2012 Christoph Hein

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Remaining threshold after load without visible damage © 2012 Christoph Hein

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Basin III after impoundment © 2012 Christoph Hein

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Accumulation 2012 © 2012 Christoph Hein

Land use before the start of the measure : Riding arena artificially raised by sand backfilling © 2006 Christoph Hein

Land use before the measure: riding arena © 2007 Christoph Hein

Building operations 2010 © 2010 Christoph Hein

Building operations 2010 © 2010 Christoph Hein

accidental flooding during construction © 2010 Christoph Hein

Drainage of the unintentional inflowing water over the outlet sill during the construction phase © 2010 Christoph Hein

Basin with completed greening in the first vegetation period © 2011 Christoph Hein

extensive alder sprouting © 2011 Christoph Hein

Overflow sill between basin 2 and basin 3 with extensive fastening © 2012 Christoph Hein

Remaining threshold after load without visible damage © 2012 Christoph Hein

Basin III after impoundment © 2012 Christoph Hein

As a compensatory measure for a nearby technical rainwater retention basin in the upper reaches of the Nöthnitz in 2006, the project was concretely planned and structurally implemented between 2010 and 2012 on behalf of the state capital Dresden (Environmental Agency).
The aim of the measure was to create additional retention space along the small watercourse in the south of Dresden, which has strong water level fluctuations due to its catchment area, particularly during heavy rainfall events. Adjacent to the watercourse, the retention area was to be filled by flooding over a wide overflow sill at the watercourse edge during a 1-year flood event.
Following the slightly sloping topography of the site, the system consists of 3 basins connected in series by overflow sills. At the downstream end of the last basin, the system is reconnected to the watercourse by an overflow so that stronger floodwaters flow completely through the system.
The landscape design proposal was supplemented by a water level calculation and a calculation of the drag forces on the overflow sills, which are extensively paved by grass seeding.
In 3 small, extra 30 cm deepened depressions, the water often stands for months and first dragonflies have been detected here.
A first flooding still during the construction phase occurred in the course of a heavy rain event unintentionally. A flooding in 2012 in the course of a heavy thunderstorm has proven the functionality and was still documented during the heavy rain by pictures and film recordings.
About the construction project was reported in detail in the DWA_Members_Rundbrief_43_October 2013. The newsletter is available for download. (see below)

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DWA_Mitglieder_Rundbrief_43_Oktober_2013

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Planning offices

Hein, Dipl.-Ing.(FH), Christoph
Dresden

Employees
Christoph Hein

Project period
2010 - 2012

Construction amount
40.000 €

Client
Landeshauptstadt Dresden / Umweltamt

Address
Babisnauer Straße
Dresden

Show project location on map

Project type
Watercourse development, flood protection
Impact regulation and compensation