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2. 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 ...

3. 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.

4. 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;

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. Watertable control - Wikipedia

   en.wikipedia.org/wiki/Watertable_control

   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 ...

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   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

8. Water table - Wikipedia

   en.wikipedia.org/wiki/Water_table

   The water table may vary due to seasonal changes such as precipitation and evapotranspiration.In undeveloped regions with permeable soils that receive sufficient amounts of precipitation, the water table typically slopes toward rivers that act to drain the groundwater away and release the pressure in the aquifer.

9. Drip line - Wikipedia

   en.wikipedia.org/wiki/Drip_line

   Drip line may refer to: Nuclear drip line, the lines beyond which protons or neutrons leak out of nuclei; Tree drip line, the area defined by the outermost circumference of a tree canopy where water drips from and onto the ground, useful for tree crown measurement; Drip irrigation line, where the tubes and hoses are laid