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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
According to Montgomery and Dietrich’s equation, drainage density is a function of vertical hydraulic conductivity. Coarse-grained sediment like sand would have a higher hydraulic conductivity and are predicted by the equation to form a relatively higher drainage density system than a system formed by finer silt with a lower hydraulic ...
According to the figure, the drainage period is from November to March (120 days) and the discharge of the drainage system is D = 180 / 120 = 1.5 mm/day corresponding to 15 m 3 /day per ha. During winters with more precipitation than normal, the drainage requirement increase accordingly.
Once integrated, one can easily choose to solve for either volume of infiltration or instantaneous infiltration rate: = + [+ ()]. Using this model one can find the volume easily by solving for (). However, the variable being solved for is in the equation itself so when solving for this one must set the variable in question to converge on ...
The Theis equation is one of the most commonly used and fundamental solutions to the groundwater flow equation; it can be used to predict the transient evolution of head due to the effects of pumping one or a number of pumping wells. The Thiem equation is a solution to the steady state groundwater flow equation (Laplace's Equation) for flow to ...
[2] [3] In hydrology, a water balance equation can be used to describe the flow of water in and out of a system. A system can be one of several hydrological or water domains, such as a column of soil, a drainage basin, an irrigation area or a city. The water balance is also referred to as a water budget. Developing water budgets is a ...
Catchment hydrology – study of the governing processes in a given hydrologically defined catchment; Drainage basin management – covers water-storage, in the form of reservoirs, and flood-protection. Water quality – includes the chemistry of water in rivers and lakes, both of pollutants and natural solutes.
A is the constant reaction factor or response factor with unit [1/T] S is the water storage with unit [L] dS is a differential or small increment of S dT is a differential or small increment of T Runoff equation A combination of the two previous equations results in a differential equation, whose solution is: