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| Glossary ยป H |
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GlossaryThis glossary is copied from the Stormwater Manual of Western Australia Chapter 11: Further Information. References are available from this chapter. A B C D E F G H I J K L M N O P Q R S T U V W X Y Z HHeavy metals: Metals of high specific gravity (>5 g/cm3) that are present in the environment from natural and anthropogenic sources such as municipal and industrial wastes and urban runoff, and pose long-term environmental hazards. Such metals include: arsenic (As), cadmium (Cd), chromium (Cr), cobalt (Co), copper (Cu), lead (Pb), mercury (Hg), molybdenum (Mo), nickel (Ni), vanadium (V) and zinc (Zn). Hydraulic conductivity: A measure of the ease of flow through a pore space or fractures. Hydraulic conductivity has units with dimensions of length per time (e.g. m/s, m/min, or m/d). Hydraulic head: The energy, either kinetic or potential, possessed by each unit weight of a liquid expressed as the vertical height through which a unit weight would have to fall to release the average energy possessed. Used in various terms such as pressure head, velocity head and head loss. Hydrodynamic condition: The condition that influences the flow of water. Hydrologic regime: A description of the variation of flow rate or water level over time (adapted from Water and Rivers Commission 2000a). Hydrological cycle: The continual cycle of water between the land, the ocean and the atmosphere. Hydrology: The science of the behaviour of water in the atmosphere, on the surface of the earth and within the soil and underlying rocks. This includes the relationship between rainfall, runoff, infiltration and evaporation. |
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