Deep drill well water

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Deep drill well water

I m wondering where is the best spot to get enough water for irrigation in dry season ? In clay soil,sandy ?, flat surface ? Up hill,down hill or valley surface ?

Thanks

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2 Answers

  1. Dear Yim,

    Availability of groundwater for extraction depends on the soil type, with sand and gravel forming good aquifers for extraction, whereas silt or clay layers are not suited for water extraction. Groundwater will flow from the slopes into the valleys so you will have most supply in the valley. Note that river flow in the dry season is maintained by exfiltrating groundwater flowing from higher parts to the valley. Water is closest to the surface in the lower parts of the landscape so it is cheaper to place a well in the valleys then on slopes or plateaus. Recharge of groundwater may in general be higher in flat parts, where most rainfall infiltrates into the soil (no surface runoff), than on slopes as some of the rainfall on slopes does not infiltrate but runs off over the surface, especially on steeper slopes. As such the advice would be to find sand or gravel layers in the subsurface, then select a convenient extraction site where the groundwater level is such that you do not need a very deep borehole. The well location and design also depends on how much you need to extract for irrigation.  Please contact me if you need more info.

    Regards,

    Maarten

     

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    1. Thank you ,really appreciated !

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