10.4122/1.1000001469
Bordin, P.
P.
Bordin
Mayeux, M.
M.
Mayeux
Bonin, O.
O.
Bonin
Deutsch, J. C.
J. C.
Deutsch
Linking imperviousness coefficient to urbanism features through Geographical Information Systems
DTU Library, Technical University of Denmark (DTU)
2005
Conference presentation
Imperviousness coefficient
Geographic Information System
urban parameters
updating
ENPC
IGN
2005
en
10.4122/1.1000001470
text/xml
One of the major problems in the modeling of stormwater runoff is the determination of the rainfall excess. For very long time urban hydrologists have used the concept of run-off coefficient which gives an order of magnitude of run-off losses. In dense urban areas, the imperviousness area is used to approximate this run-off coefficient. There are two advantages to this approach: the ability to have a measured value independent from the rain event, and the ability to make a link with the characteristics of urbanism. Many researchers have tried to establish relations between the imperviousness coefficient and parameters such as: type of roofs for the buildings, kind of road systems (streets, pavements, places etc.), kind of public spaces (waste ground, green spaces, playground etc.). Empirical relations have been established, but in the best cases they were just valid for the sites where they have been implemented. New kinds of GIS have been developed in France which enable to search general relationship between imperviousness coefficient and urban parameters, in order to better calculate this coefficient for present urbanization and to predict its value for future urbanization.