Geonets
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A geonet is a geosynthetic material similar in structure to a geogrid, consisting of integrally connected parallel sets of ribs overlying similar sets at various angles for in-plane drainage of liquids or gases. Geonets are often laminated with geotextiles on one or both surfaces and are then referred to as drainage geocomposites. They are competitive with other drainage geocomposites having different core configurations.
A geonet is a geosynthetic material similar in structure to a geogrid, consisting of integrally connected parallel sets of ribs overlying similar sets at various angles for in-plane drainage of liquids or gases. Geonets are often laminated with geotextiles on one or both surfaces and are then referred to as drainage geocomposites. They are competitive with other drainage geocomposites having different core configurations. FS=\frac{\text{allowable (test) value}}{\text{required (design) value}} For geonets serving as a drainage medium, the targeted value is flow rate and the above concept becomes: FS=\frac{q_{allow}}{q_{reqd}} where a allow = allowable flow rate, and q reqd = required flow rate As stated previously, if we desire an alternative to the flow rate, calculations can be based on Darcy's formula (assuming saturated conditions and laminar flow) obtaining the transmissivity, θ. This important concept is repeated. q=kiA q=ki(W\times t) q=(kt)iW kt= \mathit{\Theta} = \frac{q}{iW} where q = volumetric flow rate (m 3 /s), k = coefficient of permeability (m/s), i = hydraulic gradient (dimensionless), A = flow cross-section area (m 2 ), θ = transmissivity (m 2 /s), W = width (m), and t = thickness (m). As seen in the equation, q/W and θ carry the same units and are directly related to one another by means of the hydraulic gradient i. At a hydraulic gradient of 1.0, they are numerically identical. At all other values of hydraulic gradient they are not equal. Also note that the system should be saturated and flow must be laminar in order to use transmissivity. When in doubt, it is usually best to use flow rate per unit width.
Text derived from https://en.wikipedia.org/w/index.php?oldid=1310845031 under CC BY-SA 4.0; modifications have been made.