Environmental Engineering Reference
In-Depth Information
BH8
6.37
0.38
1.38
0.19
0.03
4.10
32.54
2.60
19.00
0
0
Control
7.01
0.01
1.21
0.01
0.01
0.20
31.51
13.20
62.00
0
0
Maximum recommended levels for different water uses
Domestic
(WHO,
1993)
---
0.003
0.30
0.01
3.00
50.00
250.00
250.00
---
0
0
Domestic
(DWAF,
1996)
6.0-
9.0
5.00
0.10
0.01
3.00
6.00
200.00
100.00
---
5
0
Livestock
(DWAF,
1996)
---
10.00
0.10
20.00 100.00 1000.00 1500.00
---
200
Crops
(DWAF,
1996)
7.5-
8.4
5.00
0.20
1.00
5.00
---
100.00
---
1
likely related to the iron-rich bedrock (banded ironstone) under the landfill. Levels of
coliforms and nitrate can be related to the disposal of mainly domestic refuse on the north
side of the landfill. There may also have been some limited contribution from the
residential area, due to the presence of a small number of pit latrines and the practice of
urban agriculture in residential backyards.
It can be recommended that the city of Harare should plant more gum trees, especially
around the western (downflow) edge of the landfill. Gum trees take up a lot of water,
creating a cone of depression, and thus
Figure 7.9. Spatial variation of lead in
groundwater, Westlea (Values are in
mg/l).
