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Herbicide

Any pesticide used to destroy or inhibit plant growth; a weed killer.

High

The center of an area of high pressure, usually accompanied by anticyclonic and outward wind flow. Also known as an anticyclone.

High wind

Sustained winds greater than or equal to 40 mph or gust greater than or equal to 58 mph.

Higher heating value

Quantity of heat liberated by the complete combustion of a unit volume or weight of a fuel assuming that the produced water vapor is completely condensed and the heat is recovered; also known as gross calorific value. See lower heating value.

Highly erodible land (HEL)

Land that is very susceptible to erosion, including fields that have at least 1/3 or 50 acres of soils with a natural erosion potential of at least 8 times their T value. More than 140 million acres are classified as HEL. Farms cropping highly erodible land and under production flexibility contracts must be in compliance with a conservation plan that protects this cropland.

Histosol

Wet organic soils, such as peats and mucks.

Holding pond

A pond or reservoir, usually made of earth, built to store polluted runoff.

Humidity

The amount of water vapor in the atmosphere. (See relative humidity).

Hurricane

A severe tropical cyclone with wind speeds in excess of 74 mph (64 knots).

Hydric soil

Soil that, in its undrained state, is flooded long enough during a growing season to develop anaerobic conditions that support the growth and regeneration of hydrophytic vegetation (plants specialized to grow in water or in soil too waterlogged for most plants to survive). This term is part of the legal definition of a wetland included in the Food Security Act of 1985. The Natural Resources Conservation Service maintains a national list of hydric soils.

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