Hydrologic behaviour of stormwater infiltration systems

Project Details

Description

The hydrological behaviour of stormwater infiltration structures needs to be understood to ensure safe design and long life-time. Mathematical models may be used to assess the behaviour and sub-models are needed as part of the general urban drainage simulation models. Field measurements are established in newly constructed facilities
and by comparing measured and simulated data the significant model parameters may be estimated. In collaboration with the Department of Inner City Renovation of Copenhagen Municipality two infiltration trenches are constructed in a densely built-up part of central copenhagen. The trenches are equipped with on-line sensors measuring rain, runoff flow from the connected surfaces and water level in the trenches.

Two infiltration trenches were constructed in a densely built-up area in central Copenhagen and equipped with on-line sensors measuring rain, runoff flow from the connected surfaces and water level in the trenches. Although the two trenches are placed close to each other they function rather differently, corresponding to effective soil permeabilities of 2×10-6 m/s in one trench and a factor 10 smaller in the other. During 2¾ years of measuring 89 events were recorded, of which 7 cause overflow. Analyses of falling water tables after rain indicated slight clogging, but this effect is less important than the general lack of knowledge about soil permeability for normal design situations. The results indicate that the stormwater infiltration in central urban areas with compressed soils and backfill is more feasible than previously anticipated.

The project started in October 1994, and the first measuring campaign lasted until June 1997. The intention is to resume the measurements twice, after 5 and 10 years respectively, to investigate possible long-term changes in the hydrologic performance of the infiltration changes. A list of publications (html) related to this project and a slide show (pdf, 2,058KB) summarising the results is available on-line.
Acronym49
StatusFinished
Effective start/end date05/05/199531/12/2001

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