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Water Portal / Rainwater Harvesting / Groundwater recharge / Wells, shafts, and boreholes

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Wells that have run dry due to falling water tables from over-exploitation are also increasingly being used for this purpose. Recharge wells are advantageous when land is scarce. Water can be injected into a well or borehole and recovered from another, some distance from the first, to increase travel time and benefit from the water treatment capacity of the aquifer. This is referred to Aquifer Storage Transfer and Recovery (ASTR).

In loosely consolidated material, recharge pits and trenches are also used in cases where low permeability material overlies the aquifer, which occurs at trench-able depth, approximately 5-15m. Structures are excavated sufficiently deep to penetrate the low permeability strata, in order to provide direct access to the aquifer. Trenches or pits can be build built to maximise the side-wall surface area and minimise the bottom surface area in order to facilitate horizontal movement of recharge water into the aquifer. The facilities should ideally be covered to keep out sunlight, animals, and people.

==Suitable conditions==

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