Hydrostatic test

hydrograph method A way of forecasting stream flow by using a hydrograph to depict the changes in runoff of a drainage basin throughout a rainstorm.

hydrologic cycle The ongoing circulation of water between ocean, atmosphere, and land.

hydrologic equation The proportion of the amount of surface runoff on a piece of ground to the precipitation amount minus evapotranspiration loss, plus or minus changes in groundwater or soil water.

hydrologic response The properties, distribution, and circulation of water.

hydrology A science of properties, distribution, and circulation of water underground, on the surface, and in the air.

hydrometer method A method to determine clay content of a soil by dispersing the soil particles in water and drawing off samples at determined time intervals.

hydromulch A mixture of mulch with water or other ingredients in a machine that shoots the mixture through a hose, pipe, or nozzle. Other ingredients of the slurry may include seed, fibers, tachifyer, fertilizer, or other ingredients. Reference may be made to it in a slurry state or after dried in place.

hydromulcher This refers to a machine capable of mixing and distributing hydromulch over the ground.

hydromulching The action of applying hydro-mulch.

hydrophyte A plant adapted to water or bogs.

hydropneumatic pressure system A water supply system where the pressure in a tank or piping system is kept at a specified pressure and the pump begins operation when the pressure drops below an acceptable predetermined pressure. Pressure within the system controls the pump operation. This eliminates the need of a controller in an irrigation system to start the pump when any valve in the system is in operation.

hydroponics 1. Growing plants in water and nutrients without soil or an inert medium for support. 2. The growing of plants in water containing nutrients rather than soil where water is pumped through gravel, fiberglass, or other inert media that anchors the plants.

hydroseed A mixture of seed with water or other ingredients in a machine that shoots the mixture through a hose, pipe, or nozzle. Other ingredients of the slurry may include cellulose mulch, fibers, newspaper mulch, tachifyer, fertilizer, or other ingredients. Reference may be made to it in a slurry state or after dried in place.

hydroseeding The action of applying hydro-seed.

hydrostatic barrier The use of plants to control movement of groundwater. In phytore-mediation this is used to control the flow of contaminants.

hydrostatic head Pressure expressed as the number of vertical feet necessary for a column of water to exert pressure.

hydrostatic pressure The pressure exerted by water, especially standing water due to gravity.

hydrostatic test Usually refers to testing a closed pipe system under a required amount of fluid pressure while not allowing any movement of the fluid within the system. Any liquid movement or drop in pressure indicates leakage from the system. In irrigation work, if there are any leaks while performing this test one can often find the wet spots in the soil, allowing

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