In an influent streama)there is a contribution from the groundwater to...
If the bed of the stream is below the groundwater table, during period of low flows in the stream, the water surface may go down below the general water table elevation and the groundwater contributes to the flow in the stream such stream which receive groundwater flow are called effluent stream water percolates to the groundwater storage and a hump is formed in the groundwater table. Such streams which contribute to the groundwater are known as influent streams.
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In an influent streama)there is a contribution from the groundwater to...
Explanation:
When we talk about influent streams, we are referring to streams that are fed by groundwater. In such streams, there is a contribution from the groundwater to the stream due to seepage. However, there is no contribution from the stream to the groundwater due to percolation. Let us look at the options to understand this in detail:
a) There is a contribution from the groundwater to the stream due to seepage: This is correct. As mentioned earlier, influent streams are fed by groundwater, and this happens due to seepage.
b) There is a contribution from the stream to the groundwater due to percolation: This is incorrect. In an influent stream, the water flows from the groundwater to the stream, and there is no contribution from the stream to the groundwater.
c) There is a seepage of groundwater into the stream at the sides and percolation of stream flow water at the bed: This is partially correct. There is seepage of groundwater into the stream, but there is no percolation of stream flow water into the groundwater.
d) There will be neither seepage into the stream nor percolation from the stream to the groundwater: This is incorrect, as we have already established that in an influent stream, there is seepage of groundwater into the stream.
Conclusion:
Hence, the correct option is B, as there is no contribution from the stream to the groundwater due to percolation.
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