Comparison of Discharges from Urban Storm- Water Run-Off
313
TABLE 2
Estimated discharges from urban storm-water run-off.
Three sampling areas. Kg/ha years.
CO
CO
H
CO
co
>
>,
Λ
o
x>
03
u
o
^ s Q c o t o - e p ^ ^ - g
Q
SAMPLING AREAS
Q
>
H
>
u
P H ^ Z Z O P Q
Highway^ = 0.8
2040 605 1185 860 13.4 0.07 0.2 2.5 5.1 36 100
Terrace houses φ = 0.2
470 68 173 120 2.6 0.01 0.04 0.4 1.4 0.1 14
Residential blocks φ = 0.6 930 180 620 490 6.6 0.06 0.16 1.8 3.45 2.4 43
TABLE 3
Discharges from biologically and chemically treated
sewage water and from storm-water run-off. Kg/ha year.
CONSTITUENT
Suspended
BOD
p tot
Ntot
Bacteria:
Coli 35°
Coli 44°
Coli 35°
Coli 44°
Solids
35p/h
Treated
wastewater
95
95
5.3
124
1.8-10
12
1.4-10
12
1.8-10
10
1.4-10
10
a
Stormwater
173
14
0.04
1.4
3.7-10
11
1.7-10
11
-
_
100
Treated
wastewater
275
275
15
355
5 Ί 0
1 2
4-10
12
5-10
10
5-10
10
p/ha
Stormwater
620
43
0.16
3.5
9.2-10
11
4.2Ί0
1 1
-