Hydrological response times in lowland urban catchments characteristed by looped drainage systems

Hydrological response times in lowland urban catchments characteristed by looped drainage systems

Ten Veldhuis, J.A.E.
Skovgard Olsen, A.

Civil Engineering and Geosciences

Water Management

2012-12-31

Hydrological response times are often used to characterise runoff processes. They provide information about temporal resolution of catchments responses, thus of the required measurement resolutions of in-situ sensors as well as spatial sensors like rainfall radars. The objective of this study was to characterise response times for urban catchments in lowland areas equipped with looped, combined sewer systems. Subcatchments size vary between 0.3 and 7.8 ha. The results show that variation in catchment area size can explain only a part of variation in lag times between the subcatchments. Pipe length per subcatchment explains variations in lag times to a similar, low degree. Comparison of lag time values for looped networks and constructed branched versions of the same networks shows that lag time values are influenced by flow between subcatchments in about half of the looped networks, especially during low flow conditions. This means that in looped systems subcatchment area per exit point varies during a storm event and lag time cannot be related to a single catchment characteristic.

hydrology, response time, urban drainage

http://resolver.tudelft.nl/uuid:e5050e6b-78c1-4d43-8e3e-5c065103d13e

ETH

9783906031217

9th International Workshop on Precipitation in Urban Areas: Urban challenges in rainfall analysis; St. Moritz, Swiss, 6-9 Dec. 2012

Institutional Repository

conference paper

(c) 2012 Ten Veldhuis, J.A.E., Skovgard Olsen, A.