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The function of the field drainage system is to control the water table, whereas the function of the main drainage system is to collect, transport, and dispose of the water through an outfall or outlet. In some instances one makes an additional distinction between collector and main drainage systems.
In geotechnical engineering, watertable control is the practice of controlling the height of the water table by drainage.Its main applications are in agricultural land (to improve the crop yield using agricultural drainage systems) and in cities to manage the extensive underground infrastructure that includes the foundations of large buildings, underground transit systems, and extensive ...
Waterfowl hunting is the practice of hunting aquatic birds such as ducks, geese and other waterfowls or shorebirds for sport and meat. Waterfowl are hunted in crop fields where they feed, or in areas with bodies of water such as rivers, lakes, ponds, wetlands , sloughs , or coasts. [ 1 ]
As finally developed, the decoy consisted of a pool of water, leading from which are from one to eight curved, tapered, water-filled ditches. Over each ditch is a series of hoops, initially made from wood, later from iron, which diminish in size as the ditch tapers. The hoops are covered in netting.
Two-man layout boat and decoys. Layout boat hunting is a sub specialty of traditional waterfowl hunting which is done in a low-profile un-motorized boat with a unique design that allows the hunter to maintain a close position to the water in order to conceal them in open water areas that are frequented by diver and ocean ducks.
Recycling agricultural drainage water is an effective non-conventional method to overcome water scarcity in arid areas. In the United States, although the Federal Water Pollution Control Act legislates water quality and pollution at the national level, water reuse laws and regulations are the responsibility of states and local governments ...
Pesticides are widely used by farmers to control plant pests and enhance production, but chemical pesticides can also cause water quality problems. Pesticides may appear in surface water due to: direct application (e.g. aerial spraying or broadcasting over water bodies) runoff during rain storms; aerial drift (from adjacent fields). [3]: p.2–22
A system of pumping stations, canals, weirs and gates allows it to increase or decrease the water level in a network of ditches and thereby control the water table. Subirrigation is also used in the commercial greenhouse production, usually for potted plants. Water is delivered from below, absorbed by upwards, and the excess collected for ...