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Table 1

Basic characteristic of the monitored catchments and CSO

 ParametersUnitJ1J4B1
Catchment Total area (ha) 211 1,714 609 
Imperviousness (%) 33 30 42 
Land use (order of decreasing share of surface)  MFR, G, IND MFR, IND, G MFR, SFR, IND, C, G 
Mean slope of terrain (%) 0.58 0.73 0.63 
Mean slope of sewerage (%) 0.45 0.76 0.53 
CSO Type of weir  side side side 
CSO weir length (m) 4.92 12.00 12.74 
Mean dry weather flow (m3/s) 0.09 0.82 0.47 
Critical flowa (m3/s) 0.38 2.99 2.06 
Minimum dilution of sanitary flow  4.2 3.6 4.3 
Rainfall threshold for overflow (mm) 2.93 1.79 2.97 
Frequency of overflow per year  23 13 19 
Average annual volume of overflow (thousand m360 117 3812 
 ParametersUnitJ1J4B1
Catchment Total area (ha) 211 1,714 609 
Imperviousness (%) 33 30 42 
Land use (order of decreasing share of surface)  MFR, G, IND MFR, IND, G MFR, SFR, IND, C, G 
Mean slope of terrain (%) 0.58 0.73 0.63 
Mean slope of sewerage (%) 0.45 0.76 0.53 
CSO Type of weir  side side side 
CSO weir length (m) 4.92 12.00 12.74 
Mean dry weather flow (m3/s) 0.09 0.82 0.47 
Critical flowa (m3/s) 0.38 2.99 2.06 
Minimum dilution of sanitary flow  4.2 3.6 4.3 
Rainfall threshold for overflow (mm) 2.93 1.79 2.97 
Frequency of overflow per year  23 13 19 
Average annual volume of overflow (thousand m360 117 3812 

MFR, multi-family residential; SFR, single-family residential; IND, industrial; C, commercial; G, green.

aActivating the overflow.

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