Agriculture Reference
In-Depth Information
Figure 7.4 Spatial patterns of water contamination with As, Pb and FC in
the Rı´mac River for the year of greatest contamination (2000 or 2001) and
the most recent year (2004)
Pb still exist in the Rı´ mac River basin which could pose an important risk for
agricultural activity in the Rı´ mac Valley. Figure 7.6 shows the degree of
mining activity established long ago in the basin.
A different situation regarding microbiological contamination was
observed. FC were found to be higher than 10
5
/100ml in almost the entire
river except for a small section of the highest part of the basin (see Figures 7.3
and 7.4). These findings were also reported in other studies (Castro and Sa´ enz,
1990; Moscoso and Leo´ n, 1994; Moscoso, 1998; Acosta et al, 2001; Manrique
et al, 2002a, b). These high levels of FC present in the river are due to the
