Glossary beginning with H

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H

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Hanging Lines

A line not verified by mathematical closure, but has been verified by two independent measurements.

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Hazard Land

Lands which may be prone to flooding, shoreline erosion or slope instability hazards or any hazard that may result in life loss or injury, property damage, social and economic disruption or environmental degradation. Hazards may include surface and subsurface features such as active and abandoned gas/oil wells, mines, unstable slopes, areas exhibiting subsidence and other natural or man-made features.

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Hectare

Metric unit of area equal to 10,000 square metres, or 2.471 acres, or 107,639 square feet.

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Herbicide

Chemicals used to kill undesirable vegetation.

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Hereditament

Things that can be given in a will.

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Hide

An obsolete Old English unit of area usually equal to 120 acres.

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High Water Mark

The line which the water impresses on the soil by covering it for sufficient periods to deprive it of upland vegetation. Term often used in older documents to describe a riparian boundary. Now interpreted as water's edge by court decisions.

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Highway

A free and public road, way, or street; one which every person has the right to use.

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Hydraulic Flow

The flow of water in a channel as determined by such variables as velocity, discharge, channel roughness and shear stress.

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Hydrogeology

The geology of groundwater , with particular emphasis on the chemistry and movement of water.

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Hydrographic Surveying

The process of gathering bathymetric information about water bodies; e.g. depths.

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Hydrology

The study of the occurrence, distribution and circulation of the natural waters of the earth.

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