ABE 66 Land and Water Conservation Engineering PDF

ABE 66 Land and Water Conservation Engineering Indie G. Dapin Department of Agricultural and Biosystems Engineering College of Engineering Central Mindanao University  Sustainable Water Resources and...

ABE 66 Land and Water Conservation Engineering Indie G. Dapin Department of Agricultural and Biosystems Engineering College of Engineering Central Mindanao University  Sustainable Water Resources and Management Sources of water Water resources assessment/characterization Water resources development Well construction and development Methods of construction Digging (1-10 m depth) Driving (10 to more than 15 m depth) Jetting (small diameter, up to 30 m depth) Boring Drilling Dug wells – generally large diameter (>1 m) and were often lined with rock or brick. – usually shallow (15 m) – works in relatively rock-free, unconsolidated formations Jetted wells – can only be used in unconsolidated formations – Water is pumped through the casing and emitted through a special jetting valve and/or the screen. – For dense clays, shell beds, or partially cemented formations, a chisel bit can be added to the end of the casing. – installation by hand (up to 10 m); mechanically driven hammers (>15 m) – most common with small-diameter (50-300 mm), relatively shallow wells (up to 30 m). Soil and Water Conservation Engineering 7th Edition Well construction and development Methods of construction Bored wells – constructed with augers – well diameters are typically 50-760 mm, and depth of