DEEP DRILL WATER FOR IRRIGATION

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DEEP DRILL WATER FOR IRRIGATION

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. Eng. Munashe Mvura

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    1. The inquiry on suitable depth for irrigation in clay,sandy, hillside and valley areas is subject to various factors.

       

      In Zimbabwe the general recommended depth is 80 -100 meters deep. The depth of well development  is key to enhance sustainable volumes of water for irrigation pumping allowing adequate recharge in a 72 hr irrigation cycles. 

  3. Aqueous layers and its ingredients

    Aquifer: refers to an organization that, in addition to having water, is able to transfer water from one point to another in case of hydraulic gradient. The inherent permeability coefficient of the aquifer constituents is about 0.01 Darcy or higher. Above or below aquifers may be an impermeable confining layer.

    Aquitard: There are layers that contain water, but their hydraulic conductivity is low. If there is an aquifer layer between two aquifers, it is possible to transfer water from one aquifer to another aquifer even at a low speed. Therefore, aquifers are important in terms of feeding aquifers if they are located in its vicinity. But if a well is only dug in them, it will not produce water. In short, aquifers are layers with low permeability that can store water and transfer it from one aquifer to another at a low speed.

    Aquiclude: Aquiclude refers to layers that can store water due to having many pores, but their water conductivity is so low that they cannot transfer water in large quantities. These water layers are usually placed as layers above and below the aquifers and create limiting boundaries for them. Clay layers are an example of Aquicludes. In fact, their hydraulic conductivity is so low that they can be considered closed or confined aqueous layers.

    Aquifuge: Aquifuge refers to completely impenetrable layers that do not have interconnected pores and are therefore unable to transfer water from one point to another. If there is a layer of aquifer between two aquifers, the communication between them is completely cut off in terms of water exchange. A granite layer is an example of an aquifer. They usually lack water.

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    1. Thank you very much,i really appreciated you

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  4. sandy or valley surface are the best but clay does not give you enough water

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    1. Thank you very much,i really appreciated you

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  5. In general clay soils have a better water tension than sandy soils - so they tend to act as the boundary layer that the rain water is absorbed above it. So a combination between a sandy soil with Clay under would be perfect. Although I  am now generalizing chances to find water are grater down hill

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    1. Thank you very much,i really appreciated you

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  7. All you have mentioned may have potential to give water but depends on a lot of factors. eg. clay may be an aquifer if it is highly fractured and interconnected, you can get water uphill, downhill, valley etc, depending on water table and others, But in all, consult a hydrogeologist to give you information about the groundwater potential of your area of interest. It is not just looking at the surface but to understand if an aquifer exist that is capable of yielding water that meets your requirements.

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    1. Thank you very much,i really appreciated you