How Deep Should A Borehole In Zimbabwe Be?
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1. Seasonal Rise And Fall Of The Water Table: During the year, the water table will fluctuate up and down in the borehole in response to seasonal precipitation in the area and local groundwater use. The borehole must therefore be drilled deeper than the lowest expected elevation of the water table. Water level fluctuations may occur over several years if there have been drought conditions. Knowing the lower limit of the range of water levels over several years therefore can be helpful.
2. Surface Contamination Risks: Deeper boreholes that are properly constructed usually provide guaranteed protection from bacterial contamination sources originating at the surface. Increasing the borehole depth and the length of the borehole casing will result in a longer flow path of water from recharge at the surface to pumping from the borehole. The longer the length of time water is in the subsurface, the more opportunity there is for bacteria to die off or be trapped by soil and rock.
4. Low Yielding Rock Formations: In low yielding rock formations the borehole may have to be drilled deep enough to serve as a storage cavity for groundwater. Once a borehole is drilled, the total depth, depth to the top of the groundwater table (static level) and diameter of the borehole determine how much water will be stored within the borehole cavity. The larger the borehole diameter the more water will be stored for a given borehole depth and water table elevation.
Water Systems Zimbabwe is looking forward to your call or WhatsApp Message.
Please feel free to leave a message on our WhatApp number or alternatively please call us and we will be able to help you straight away. If you would prefer, send us an email with your details and an outline of your enquiry and we will be pleased to come back to you.
We respond to all enquiries usually within 24 hours, but guarantee within 48 hours.
Our Contact Numbers Are:
Water Systems Sales: +263 77 389 8979.
Water Systems Sales: +263 71 918 7878.
Solar Systems Sales: +263 78 922 2847.
Solar Systems Sales: +263 78 293 3586.
Please feel free to leave a message on our WhatApp number or alternatively please call us and we will be able to help you straight away. If you would prefer, send us an email with your details and an outline of your enquiry and we will be pleased to come back to you.
We respond to all enquiries usually within 24 hours, but guarantee within 48 hours.
Our Contact Numbers Are:
Water Systems Sales: +263 77 389 8979.
Water Systems Sales: +263 71 918 7878.
Solar Systems Sales: +263 78 922 2847.
Solar Systems Sales: +263 78 293 3586.
“How Deep Should A Borehole In Zimbabwe Be?” is a common question before drilling a borehole.
If the driller has drilled several boreholes in the nearby area, he may be able to estimate the approximate depth where water will be encountered. Most of the time, however, the depth needed to find the required borehole yield cannot be determined accurately prior to drilling.
A borehole is an engineered hole in the ground via which groundwater can be brought to the surface. Drilling machines can drill to great depths.
Deeper boreholes usually cost more than a shallow borehole to construct in the short run. However, not drilling deep enough can result in later problems that will be much more expensive to fix. Listed below are some of the factors that may influence decisions about the depth of the water borehole.
1. Seasonal Rise And Fall Of The Water Table: During the year, the water table will fluctuate up and down in the borehole in response to seasonal precipitation in the area and local groundwater use. The borehole must therefore be drilled deeper than the lowest expected elevation of the water table. Water level fluctuations may occur over several years if there have been drought conditions. Knowing the lower limit of the range of water levels over several years therefore can be helpful.
2. Surface Contamination Risks: Deeper boreholes that are properly constructed usually provide guaranteed protection from bacterial contamination sources originating at the surface. Increasing the borehole depth and the length of the borehole casing will result in a longer flow path of water from recharge at the surface to pumping from the borehole. The longer the length of time water is in the subsurface, the more opportunity there is for bacteria to die off or be trapped by soil and rock.
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| How Deep Should A Borehole In Zimbabwe Be? |
3. Poor Quality Water Zones: In some areas of Zimbabwe with multiple aquifers, there may be zones of poor water that should be avoided or “cased off” so this lower quality water does not adversely impact the borehole. Information about the expected rock formations, likely local changes in water table depth and the water quality for a general region can be obtained from the driller, local offices of the United States Geological Survey, state geological surveys or geology departments at local universities and colleges.
4. Low Yielding Rock Formations: In low yielding rock formations the borehole may have to be drilled deep enough to serve as a storage cavity for groundwater. Once a borehole is drilled, the total depth, depth to the top of the groundwater table (static level) and diameter of the borehole determine how much water will be stored within the borehole cavity. The larger the borehole diameter the more water will be stored for a given borehole depth and water table elevation.
To find the “thickness” of the water stored in the borehole subtract the depth to the static water level from the drilled depth of the borehole.
Water Systems Zimbabwe is looking forward to your call or WhatsApp Message.
Please feel free to leave a message on our WhatApp number or alternatively please call us and we will be able to help you straight away. If you would prefer, send us an email with your details and an outline of your enquiry and we will be pleased to come back to you.
We respond to all enquiries usually within 24 hours, but guarantee within 48 hours.
Our Contact Numbers Are:
Water Systems Sales: +263 77 389 8979.
Water Systems Sales: +263 71 918 7878.
Solar Systems Sales: +263 78 922 2847.
Solar Systems Sales: +263 78 293 3586.
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