{UAH} WBK@DRILLING VS BOREHOLES
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1:22 AM |
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A borehole is different from a shallow well.
Shallow wells are dug into the water bearing soil near the surface - just below the water table. The minimum distance from a latrine we were told in P5 is 30m (100ft).
A borehole is drilled in to the water bearing strata below the ground. Usually more than 20m deep. The water down there has gone through more filtration and is cleaner. Down there, there's little or no direct influence from surface contaminants.
But it also depends. Most latrines are dug to 5m (17ft) . . . So, if a borehole is drilled close, then you could get contamination of the water bearing strata.
I always advice people to build sealed latrines. They are safer for the ground and can be emptied when full.
Boreholes are not recommended for urban or sub urban area because of the high numbers of latrines and soak away pits. Most of the septic tanks are poorly constructed thus doesn't perform its function leading to high ground water pollution in this area.
DRILLING VS BOREHOLES
Drilling is expensive (consider 25m-40m, if the Site is about 35km from Kampala). But Water is reliable for all generations.
Digging boreholes is inexpensive (consider Btw 4m-8m, if Site is less than 35km from Kampala)· its Water sometimes may not be reliable in the Dry season especially for commercial use. The only difference is that drilling is expensive compared to digging, but drilled water is way too reliable through out all weather conditions
A deep well (Borehole) can not be dug. It can only be drilled. Because it usually goes to as far as 90 - 130m deep.
A shallow well can be dug manually. It usually stops at a depth of about 10 - 30m.
The preference on the two is dictated upon by the quality and quantity of water, design and cost of construction, purpose of the well and pumping system.
For domestic use, the water from the hand-dug shallow well would suffice, if well treated and protected. But the quantity may not be of constant supply (because the water comes from underground springs that may dry up during drought). Hand-dug wells, if constructed and installed with solar pumps, would cost you around UGX 6M/-
However, for agricultural or community consumption, a borehole would be more reliable for both quantity, constant supply and even quality (Borehole water comes from aquifers/cracked rocks). But drilling is much more expensive. Drilling a borehole and installing submersible solar-powered pump would cost around UGX 28 - 34M/-. But you would use it for more than 30years with constant supply of water before repair or replacement.
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-- Shallow wells are dug into the water bearing soil near the surface - just below the water table. The minimum distance from a latrine we were told in P5 is 30m (100ft).
A borehole is drilled in to the water bearing strata below the ground. Usually more than 20m deep. The water down there has gone through more filtration and is cleaner. Down there, there's little or no direct influence from surface contaminants.
But it also depends. Most latrines are dug to 5m (17ft) . . . So, if a borehole is drilled close, then you could get contamination of the water bearing strata.
I always advice people to build sealed latrines. They are safer for the ground and can be emptied when full.
Boreholes are not recommended for urban or sub urban area because of the high numbers of latrines and soak away pits. Most of the septic tanks are poorly constructed thus doesn't perform its function leading to high ground water pollution in this area.
DRILLING VS BOREHOLES
Drilling is expensive (consider 25m-40m, if the Site is about 35km from Kampala). But Water is reliable for all generations.
Digging boreholes is inexpensive (consider Btw 4m-8m, if Site is less than 35km from Kampala)· its Water sometimes may not be reliable in the Dry season especially for commercial use. The only difference is that drilling is expensive compared to digging, but drilled water is way too reliable through out all weather conditions
A deep well (Borehole) can not be dug. It can only be drilled. Because it usually goes to as far as 90 - 130m deep.
A shallow well can be dug manually. It usually stops at a depth of about 10 - 30m.
The preference on the two is dictated upon by the quality and quantity of water, design and cost of construction, purpose of the well and pumping system.
For domestic use, the water from the hand-dug shallow well would suffice, if well treated and protected. But the quantity may not be of constant supply (because the water comes from underground springs that may dry up during drought). Hand-dug wells, if constructed and installed with solar pumps, would cost you around UGX 6M/-
However, for agricultural or community consumption, a borehole would be more reliable for both quantity, constant supply and even quality (Borehole water comes from aquifers/cracked rocks). But drilling is much more expensive. Drilling a borehole and installing submersible solar-powered pump would cost around UGX 28 - 34M/-. But you would use it for more than 30years with constant supply of water before repair or replacement.
"When a man is stung by a bee, he doesn't set off to destroy all beehives"
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