![]() ![]() For very long slopes or along the base of a facility, flow must continue unimpeded from one geonet to the next. ![]() If triplanar or boxlike channel geonets are being used for their high flow in the machine direction, the proper orientation is critical during placement. There are two reasons for this: First, the machine direction has the greatest strength and flow rate second, such orientation eliminates seams along the flow direction. The rolls are usually placed with their roll directions oriented up-and-down slope, rather than along (or parallel to) them. Contamination can occur from soil, miscellaneous sediment, construction debris, ingrowing vegetation, and so on. While UV and heat effects are not as severe in geonets as they are in geotextile (because of thicker ribs in contrast to thin yarns and fibers), it is good practice not to leave the material exposed and subjected to accidental damage or contamination of any variety. They should be placed and covered in a timely manner. Geonets are supplied in rolls from 2.0 to 6.7 m wide. When in doubt, it is usually best to use flow rate per unit width. Also note that the system should be saturated and flow must be laminar in order to use transmissivity. At all other values of hydraulic gradient they are not equal. At a hydraulic gradient of 1.0, they are numerically identical.
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