Well Types Artesian well Different types of drilling

ll pe Large-Diameter Wells Drilled Wells Dug Bored Constructed with boring machine Shallow or

Groundwater What is Groundwater Ground water is water held within the interconnected openings of

Artesian Basins Recharge Area Conduit Area Discharge Area

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Well Types

Artesian well

Different types of drilling well

Dug well

Drilled Well Dug/Bored Well Driven,

ll pe Large-Diameter Wells Drilled Wells Dug Bored Constructed with boring machine Shallow or deep (15 m/50 ft or less) Well Points (Driven, Jetted, San cri Drilled with rotary or cableon tool water well drill Shallow or deep (15 m/50 ft to 60 m/200 ft or more) Small-diameter casing, 10 – 20 cm (4 to 8 in. ) Made of steel (usually) Dug by backhoe or by hand Usually shallow (9 m/30 ft or less) Large-diameter casing (60 cm/24 in. to 120 cm/48 in. ) Made of concrete, rocks, bricks, or wood Small-diameter casing (2. 5 cm/1 in. to 5 cm/2 in an Can reach deeper aquifers es Can drill into bedrock Less subject to contamination, especially if deep Easier to seal More constant temperature Easy to construct Inexpensive initial cost Generally simple and inexpensive to install ad Vulnerable to deep aquifer ag contaminants Poorer natural water quality from some deep aquifers may occur, e. g. , from salt If shallow, water shortages are possible in dry periods Easy to seal properly, but requires large volumes of material Vulnerable to near-surface contamination Water temperature may change More controlled hole than dug well Driven in or jetted with w Shallow (15 m/50 ft or les Large casing provides storage May be used in poor-yielding aquifer Limited to permeable materials Shallow water table Limited yield and possib shortages in dry periods Vulnerable to near-surfa