(hydraulics, surface science) For a porous material, the ratio of porosity (ratio of volume of interstitial space filled with fluid to volume of material) to specific surface area (ratio of surface area in contact with fluid to volume of material); for a pipe or channel, the ratio of cross-sectional area to wetted perimeter.

(geology) A material property (e.g., for rocks or soil) that describes the rate which water can flow through pore spaces or fractures. SI units: m/s. Symbol: K.

A form of mining that uses pressurized water jets to dislodge rock or move sediment.

plural of hydraulic limestone

An arrangement for lifting water, consisting of an endless belt fitted with buckets which empty as they turn over an upper wheel.

plural of hydraulic belt

quicklime obtained from hydraulic limestone, and used for cementing underwater, etc.

A cement or mortar made of hydraulic lime, which will harden underwater.

A limestone which contains some clay, and which yields a quicklime that will set, or form a firm, strong mass, underwater.

(mechanical engineering) Powered by a diesel engine via a hydraulic transmission.