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A drainage equation is an equation describing the relation between depth and spacing of parallel subsurface drains, depth of the watertable, depth and hydraulic conductivity of the soils. It is used in drainage design. Parameters in Hooghoudt's drainage equation. A well known steady-state drainage equation is the Hooghoudt drain spacing equation.
Fixture unit - Wikipedia ... Fixture unit
Canal lining is the process of reducing seepage loss of irrigation water by adding an impermeable layer to the edges of the trench. Seepage can result in losses of 30 to 50 percent of irrigation water from canals, so adding lining can make irrigation systems more efficient. Canal linings are also used to prevent weed growth, which can spread ...
Hazen–Williams equation
Hydraulic head - Wikipedia ... Hydraulic head
Drainage density
Prices for piped water supply provided by utilities, be they publicly or privately managed, are determined administratively (see water tariffs). They vary from US$0.01 to almost US$8 per cubic meter (including sewer tariffs). Portland 2.17 gallons cost $0.01 [3]
Water supply network
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