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2. Drainage system (agriculture) - Wikipedia

   en.wikipedia.org/wiki/Drainage_system_(agriculture)

   The regular surface drainage systems, which start functioning as soon as there is an excess of rainfall or irrigation applied, operate entirely by gravity. They consist of reshaped or reformed land surfaces and can be divided into: Bedded systems, used in flat lands for crops other than rice;

3. Tree crown measurement - Wikipedia

   en.wikipedia.org/wiki/Tree_crown_measurement

   All four circumscribe the crown area's drip-line with a polygon and divide the polygon into a series of adjacent triangles, measure the area of each triangle and sum them. One option, the Polygonal Method, measures each side of a triangle to compute its area. The second and third methods uses azimuths and one distance to the trunk calculate the ...

4. Drainage equation - Wikipedia

   en.wikipedia.org/wiki/Drainage_equation

   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.

5. Drainage research - Wikipedia

   en.wikipedia.org/wiki/Drainage_research

   In irrigated lands, subsurface drainage may be required to leach the salts brought into the soil with the irrigation water to prevent soil salination. Agro-hydro-salinity and leaching models like SaltMod [ 6 ] may be helpful to determine the drainage requirement.

6. Well drainage - Wikipedia

   en.wikipedia.org/wiki/Well_drainage

   With a well spacing equation one can calculate various design alternatives to arrive at the most attractive or economical solution for watertable control in agricultural land. The basic flow equation cannot be used for determining the well spacing in a partially penetrating well-field in a non-uniform and anisotropic aquifer, but one needs a ...

7. SahysMod - Wikipedia

   en.wikipedia.org/wiki/SahysMod

   SahysMod is a computer program for the prediction of the salinity of soil moisture, groundwater and drainage water, the depth of the watertable, and the drain discharge in irrigated agricultural lands, using different hydrogeologic and aquifer conditions, varying water management options, including the use of ground water for irrigation, and several crop rotation schedules, whereby the spatial ...