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2. Gelisol - Wikipedia

   en.wikipedia.org/wiki/Gelisol

   The word "Gelisol" comes from the Latin gelare meaning "to freeze", a reference to the process of cryoturbation that occurs from the alternating thawing and freezing characteristic of Gelisols. In the World Reference Base for Soil Resources [1] (WRB), most Gelisols belong to the Cryosols. In soil taxonomy, Gelisols key out before the Histosols ...

3. Barcol hardness test - Wikipedia

   en.wikipedia.org/wiki/Barcol_hardness_test

   The Barcol hardness test is generally used on soft materials such as rigid plastics. It measures hardness based on indentation of a sharp point with a flat tip. The test is performed using a similar method and indentation device as that used to measure Shore D hardness, however the Shore D indentor has a round tip. [4]

4. Level sensor - Wikipedia

   en.wikipedia.org/wiki/Level_sensor

   Pressure in the tube is proportional to the depth (and density) of the liquid over the outlet of the tube. [3] Air bubbler systems contain no moving parts, making them suitable for measuring the level of sewage, drainage water, sewage sludge, night soil, or water with large quantities of suspended solids. The only part of the sensor that ...

5. Flow device - Wikipedia

   en.wikipedia.org/wiki/Flow_device

   The Fence and Pipe flow device needs very little maintenance and limits where and how high the beavers can dam; however, to be most effective, the intake end of the pipe should usually sit in at least 3 feet (91 cm) of water. When this water depth is not possible, a simple Culvert Protective Fence may be the best option.

6. Hydraulic diameter - Wikipedia

   en.wikipedia.org/wiki/Hydraulic_diameter

   For the limiting case of a very wide duct, i.e. a slot of width b, where b ≫ a, and a is the water depth, then D H = 4a. For a fully filled duct or pipe whose cross-section is a convex regular polygon , the hydraulic diameter is equivalent to the diameter D {\displaystyle D} of a circle inscribed within the wetted perimeter .

7. Water flow test - Wikipedia

   en.wikipedia.org/wiki/Water_flow_test

   A process to perform a water flow test is explained in the model fire codes as published by NFPA (National Fire Protection Association). If a water supply source is considered weak compared to what is required by the sprinkler system design hydraulic calculation , the water pressure can be boosted by means of a fire pump .