Dear Mr. Aruchamy  I am not ...

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Dear Mr. Aruchamy

 

I am not familiar with the subsoil and the geological substratum of your region and it would be probably best to consult a local geologist / hydro-geologist.

However, your description of the phenomenon leads me to think that the percolation pattern in the area has changed and water now percolates to deeper geological strata, below the river network in your (upper ?) part of the catchment. Changes in the percolation patterns might be caused by agricultural practices as deep ploughing which can disturb impermeable soil layers or – if not caused by human intervention – by seismic activity. The fact that there is runoff during periods of intense rainfall might be explained with a limited percolation capacity of the subsoil / the geological substratum.

 

With kind regards

 

Richard Kuntner 

 

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Hi Richard Kuntner ,

Thanks for the response.

The agricultural activities is 1 mile or more from the catchment area in the hill - Still there could be an impact due to deep ploughing ?

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Dear Mr. Aruchamy

Deep ploughing might eventually have an influence if "intermediate flow" from the hills to a stream network passes below the agricultural area. I am however feeling a little bit like speculating as I am not familiar with the catchment.

May I suggest that you delineate on the map you added the catchment, the stream network and the agricultural area and eventually mark a neighbouring catchment where no changes in the hydrologic response has been observed ? This could eventually help all participants in the discussion to better orientate themselves.

By the way: I had a closer look at your map and found the exact location you indicated using Google Earth - this map might give some hints on how the basin used to work - if the stream networks indicated on the map are accurate and I read the map correctly - a stream network originating in the hills disappears in the plane and another starts in the plane close to the bottom of the hills. (Both networks are ot the west of the location you indicated by the coordinates). In the first case there might be a percolation to deeper geological strata and in the second case the network might be alimented by intermediate flow from the hills. Nevertheless, here again I am still guessing.

 

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