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Water Portal / Rainwater Harvesting / Surface water / River-bottom intake

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[[Image:intake icon.png|right|80px]]

'''River-bottom or Tyrolean intakes ''' (different than a [[Tyrolean weir]]) for drinking-water systems are usually used in small rivers and streams where the sediment content and bed load transport are low. The water is abstracted through a screen over a canal (usually made of concrete and built into the river bed). The bars of the screen are laid in the direction of the current and sloping downwards, so that coarse material cannot enter. From the canal, water enters a sand trap and then may pass a valve and flow by gravity, or be pumped into the rest of the system.

Intake designs aim to avoid clogging and scouring and to ensure the stability of the structure even under flood conditions. Where the river transports no boulders or rolling stones, an unprotected intake may be adequate.

Winona

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