Intakes consist of the openings, strainers, or gratings through
which the waters enters and the conduit carrying the water to the
sump.
Should be located such that minimum interference to supply
Points to be consideredSource of supplyCharacter of surroundings
depth of waternavigation requirementscurrentbottom scourpossibility
of pollutionprevalence of floating material like Ice
Selection of site
Intakes from impounding reservoirsWater quality at different
levels likely to varyfluctuations in water levels ports at
different heightsUsually a concrete tower in deep water near the
u/s toe of damIf masonry dam, intake may be a well in the dam
structure itself
Lake IntakeSimilar to reservoir if depth is available near
bankselse, a submerged intake crib or bell mouth providedCribs of
heavy timber2.5 m above the botomentering velocities less than 0.15
m
River IntakesSimilar to reservoir intakes, with multiple
portsSuitable foundation is necessaryNeed screens and provision to
reverse flow for cleaning of screensPipe intakes, Wet wells or dry
wellsAlways located u/s of a city
