Given that human activity will have had the least impact there, the river's highest point should have the cleanest water.
The activities keep the majority of the water from evaporating and entering the atmosphere. The soil allows pollutants from the operations to seep into the water table.
Field topography, soil type, and water availability and quality should all be taken into account while choosing a field to grow vegetables. Reduced sediment discharge into the sea is one result of the construction of dams on rivers that catch sediments in reservoirs.
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