Bioswales in icy circumstances Urriðaholt (2014-2022?)

(Bio)swale

Created at: 22 Mar 2022

Description

Urridaholt is a new hillside community in the town of Gardabaer, Iceland. It is a pioneering development in Iceland, which has already received international awards and recognition for its sustainability and quality-of-life approach. A part of this approach is an extensive sustainable urban drainage system that will preserve the local hydrology in Urridaholt and protect the environmental quality of lake Urridavatn that is perched below the hill. (Youtube video about SUDS in , Urridaholt 2013)

Conclusions research concerning hydraulic performance of a pilot swale constructed in 2009 with local material (june 2021)

  1. Swales in maritime cold climates are susceptible to frequent frost formation.
  2. Frost reduces soil porosity and infiltration capacity of grass swales.
  3. Snow leads to concentrated runoffs which reduces the infiltration capacity.
  4. Rain on snow events followed by freezing temperatures promote frost formation.
  5. A well-drained soil is essential to avoid the adverse effects of cold climates.

Samenvatting (Dutch description)

In juni 2021 is een wetenschappelijk onderzoek opgeleverd naar het functioneren van wadi's in Urriðaholt. Deze nieuwe woonwijk heeft als dragende structuur een serie van wadi's als basisstructuur voor verwerking hemelwater. De wijk zou rond 2020 klaar moeten zijn. Googlemaps met luchtfoto’s van 2022 laat zien dat ca 2/3 klaar is.

Het ontwerp van de wadi's is gemaakt door een noors bedrijf: COWI AS - Grenseveien 88 Postboks 6412 Etterstad, 0605 Oslo

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