Table 1.

Land use proportions and population densities in the Orge River sub-catchments drained by the river monitoring sites

Sub-catchments	Dourdan	Egly	Yvette	Viry (outlet)
Urban areas (%)	1	11	20	56
Agricultural land (%)	86	49	42	33
Forests (%)	12	40	38	12
Population density (inhabitants.km−2)	300	1400	2100	5000