A Model for the Assessment of the Water Footprint …
73
Table 1 Limit values of Spanish regulations on dumping for the study area. Sources: R. D. 849/1986
and the river Guadalquivir Hydrographic Confederation (CHG)
Waste water
parameter
Units
C máx Table 1
RD
C máx Table 2 RD C máx Table 3 RD C nat
Chemical oxygen
demand
mg O 2 /l
500
200
160
50
Biological oxygen
demand
mg O 2 /l
300
60
40
100
Total solids
mg/ l
300
150
80
5
Total nitrogen
mg/l
50
50
15
–
Total phosphorus
mg/l
20
20
10
0,1
Total coliforms
ud/100 ml 2,5
2,5
2,5
10
Source
R.D. 849/1986. Legal limits
CHG
Source Own elaboration based on bibliographical data
Table 2 Most common
values of the runoff
coefficient [88]
Type of surface
C
Wooded and forest zone
0,10 a 0,20
Zone with dense vegetation granular terrain
0,05 a 0,35
Zone with dense vegetation clayey terrain
0,15 a 0,50
Zone with medium vegetation granular terrain
0,10 a 0,50
Zone with medium vegetation clayey terrain
0,20 a 0,75
No vegetation
0,20 a 0,80
Cultivated zone
0,20 a 0,40
Gravel surface
0,15 a 0,30
Paving
0,50 a 0,70
Bituminous concrete pavement
0,70 a 0,95
Hydrological Plan establishes for the riverbed receiving the discharge a limited water
catalogue.
WFgrey can be quantified with different parameters, but when there are several
contaminants the WFN standard specifies that the WFgrey of the most significant
contaminant should be considered.
2.1.3 Green Water Footprint (WFgreen)
Examples of models, generally applied to the agricultural sector, are known: at the
national level [65] based on averages that introduce imprecision into the calculations,at the hydrological basin scale [69] but at the local level, and in particular, for
the urban area, there are no representative examples as systematized information on
73
Table 1 Limit values of Spanish regulations on dumping for the study area. Sources: R. D. 849/1986
and the river Guadalquivir Hydrographic Confederation (CHG)
Waste water
parameter
Units
C máx Table 1
RD
C máx Table 2 RD C máx Table 3 RD C nat
Chemical oxygen
demand
mg O 2 /l
500
200
160
50
Biological oxygen
demand
mg O 2 /l
300
60
40
100
Total solids
mg/ l
300
150
80
5
Total nitrogen
mg/l
50
50
15
–
Total phosphorus
mg/l
20
20
10
0,1
Total coliforms
ud/100 ml 2,5
2,5
2,5
10
Source
R.D. 849/1986. Legal limits
CHG
Source Own elaboration based on bibliographical data
Table 2 Most common
values of the runoff
coefficient [88]
Type of surface
C
Wooded and forest zone
0,10 a 0,20
Zone with dense vegetation granular terrain
0,05 a 0,35
Zone with dense vegetation clayey terrain
0,15 a 0,50
Zone with medium vegetation granular terrain
0,10 a 0,50
Zone with medium vegetation clayey terrain
0,20 a 0,75
No vegetation
0,20 a 0,80
Cultivated zone
0,20 a 0,40
Gravel surface
0,15 a 0,30
Paving
0,50 a 0,70
Bituminous concrete pavement
0,70 a 0,95
Hydrological Plan establishes for the riverbed receiving the discharge a limited water
catalogue.
WFgrey can be quantified with different parameters, but when there are several
contaminants the WFN standard specifies that the WFgrey of the most significant
contaminant should be considered.
2.1.3 Green Water Footprint (WFgreen)
Examples of models, generally applied to the agricultural sector, are known: at the
national level [65] based on averages that introduce imprecision into the calculations,at the hydrological basin scale [69] but at the local level, and in particular, for
the urban area, there are no representative examples as systematized information on