Borehole vs dug well for residential off-grid builds in dry zone Hambantota?
3 Answers from travellers
Deep tube wells penetrating basement gneiss within 15 km of the Hambantota coastline regularly hit hyper-saline aquifers and high fluoride concentrations. Traditional agro-wells (wide dug wells with 15-20 foot diameters) capturing shallow rainwater recharge during the Northeast monsoon offer superior potable and irrigation water, provided you construct an impermeable silt trap.
Commission a hydrogeological resistivity survey by the Water Resources Board (WRB) before breaking ground; drilling blind in Hambantota leads to dry or brackish boreholes in 70% of exploratory attempts.
Pair wide-mouth dug wells with submerged solar pumps running during peak daylight to avoid draining the shallow groundwater table faster than its replenishment rate.
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