Abstract
The outcome reveal that as the land use in the catchment areas change from mixed agricultural to cassava cultivation, the simulated loads and concentrations of nitrogen species from cassava land-use scenario recorded reduction. The resultant concentrations of nitrate and nitrite for both current and future land-use scenarios are all below the daily limit suggested by the WHO, (World Health Organization). For the phosphate concentration, an increase of 4.21% was depicted under cassava land-use scenario. The results show that SWAT is a reliable water quality model, capable of simulating accurate information for developing environmental management plans.
Highlights
Article No~e00149 industrialization and mechanization (Sundarakumar et al, 2012; Cohen, 2006), as well as the quality associated with water
In this study we modelled and quantified the effect of cassava production on water pollution
There is a lack of available historical monitoring date on other water quality parameters for the basin
Summary
Article No~e00149 industrialization and mechanization (Sundarakumar et al, 2012; Cohen, 2006), as well as the quality associated with water. As water moves along the land surface, it carries the residues from the land. Surface runoff from different types of land use may be enriched with various kinds of contaminants. Runoff from agricultural lands may be enriched with nutrients and sediments. Runoff from highly developed urban areas mining sites may be enriched with rubber fragments, heavy metals, as well as sodium and sulphate. Evapotranspiration, infiltration, percolation and absorption of various types of vegetation cover and soil types can modify the land surface characteristics, water balance and hydrologic cycle (LeBlanc et al, 1997). It is conceivable that there is a strong relationship between land-use types and the quantity and quality of water (Filoso et al, 2003; Brodie and Mitchell, 2005)
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