Australian Water Information Dictionary

Alphabetical list of items

A   B   C   D   E   F   G   H   I   K   L   M   N   O   P   Q   R   S   T   U   V   W   Y   Z   other  

H

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The abbreviation for hectare; one hectare is equal to an area of 10 000 square metres.

Synonym: hectare

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Synonymous with abstraction in case the water is removed from the landscape water store.

Synonym: abstraction

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horizontal dilution of precision

A measure of the geometric quality of a GPS satellite configuration in the sky. Horizontal Dilution of Precision is a factor in determining the relative accuracy of a horizontal position. The smaller the dilution of precision number, the better the geometry.

Source: ESRI GIS Dictionary, viewed 4 April 2013, Copyright © 1995–2013 Esri.

Related: PDOP

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one hectare is equal to an area of 10 000 square metres.

Synonym: ha

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GDE Atlas terminology used to classify ecosystems as likely to be interacting with groundwater. It indicates that groundwater is likely to be present, and the ecosystem is likely to be using it. This categorisation means that the majority of data analysed indicated a high potential for groundwater interaction, or that the most reliable (and most heavily weighted) datasets indicated high potential.

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A retrospective forecast using observed information to validate or test a mathematical model. Known inputs for past events are entered into the model to see how well the output matches the known results.

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A probability distribution created by sampling the historical streamflow data record. It is the baseline reference used in determination of skill scores from hindcasting.

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The more recent of the two epochs of the Quaternary Period, beginning at the end of the last major Ice Age, about 10,000 years ago. It is characterised by the development of human civilisations.

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A measure of the geometric quality of a GPS satellite configuration in the sky. Horizontal Dilution of Precision HDOP is a factor in determining the relative accuracy of a horizontal position. The smaller the dilution of precision number, the better the geometry.

Source: ESRI GIS Dictionary, viewed 4 April 2013, Copyright © 1995–2013 Esri.

Related: PDOP

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A period of 60 minutes starting on the hour (e.g. 12:00).

Source: Water Regulations 2008 Regulation 1.04

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A property of soil or rock, which describes the ease with which water can move through pore spaces or fractures. It depends on the intrinsic permeability of the material and on the degree of saturation. Saturated hydraulic conductivity describes water movement through saturated media.

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Calculated as the difference between two hydraulic head measurements divided by the distance between the two measurements. Hydraulic gradient is used in the calculation of water flow.

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A topic in applied science and engineering dealing with the mechanical properties of liquids.

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Developed at the United States Geological Survey (USGS), HYDRO1k is a geographic database providing comprehensive and consistent global coverage of topographically derived datasets.

Source: Geofabric Product Guide V2.0

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One of the tiers in the National Aquifer Framework. Aggregation and classification of hydrogeologic units according to their age, depositional environment, rock type and whether they behave as an aquifer or aquitard.

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One of the tiers in the National Aquifer Framework. One or more geologic units which have similar hydrogeological characteristics and behaviour.

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The branch of geology that deals with the occurrence, distribution, movement and effect of groundwater.

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A graph showing the surface level, discharge, velocity, or some other feature of water, with respect to time. For example, a graph illustrating the discharge of a stream against time is called a discharge hydrograph.

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An internal identifier assigned when using the ArcHydro tools to implement the ArcHydro data model.

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The branch of science especially concerned with the movement and quality of water in relation to land.

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The monitoring of the components of the hydrological cycle including rainfall, groundwater characteristics, as well as water quality and flow characteristics of surface waters.

Source: Wikipedia, Viewed 5 October 2011, http://en.wikipedia.org/wiki/Hydrometry

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Seasonally or permanently wet soils. Distribution is often limited to wet drainage depressions, low lying narrow coastal plains and seepage areas on lower slopes.

Source: R F Isbell, 1996, The Australian Soil Classification, CSIRO Publishing, Melbourne.

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A table with rock or sediment types classified into hydrogeologic units along a borehole.

Synonym: bore log

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