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

/

ha

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

Synonym: hectare

This definition applies to:

harvesting

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

Synonym: abstraction

This definition applies to:

HDOP

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 05 December 2018, Copyright © 1995–2013 Esri.

Related: PDOP

This definition applies to:

hectare

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

Synonym: ha

This definition applies to:

held environmental water

water available under:

(a) a water access right; or

(b) a water delivery right; or

(c) an irrigation right;

for the purposes of achieving environmental outcomes (including water that is specified in a water access right to be for environmental use).

Source: Water Act 2007 Part 1 Section 4, at 8 Febraury 2019. For the latest information on Australian Government law please go to Federal Register of Legislation

This definition applies to:

HGC

hydrogeologic complex

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.

This definition applies to:

HGU

hydrogeologic unit

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

This definition applies to:

hindcast

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

This definition applies to:

historical reference or historical probability distribution

A probability distribution created by sampling the historical streamflow data record. It is the reference forecast used when skill scores are calculated from hindcast modelling results.

This definition applies to:

holocene

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.

This definition applies to:

horizontal dilution of precision

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 05 December 2018, Copyright © 1995–2019 Esri.

Related: PDOP

This definition applies to:

hour

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

Source: Water Regulations 2008 Regulation 1.04. For the latest information on Australian Government law please go to Federal Register of Legislation

This definition applies to:

hydraulic conductivity

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.

This definition applies to:

hydraulic gradient

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.

This definition applies to:

hydraulics

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

This definition applies to:

HYDRO1k

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

This definition applies to:

hydrogeologic complex

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.

This definition applies to:

hydrogeologic unit

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

This definition applies to:

hydrogeology

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

This definition applies to:

hydrograph

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.

This definition applies to:

HydroID

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

This definition applies to:

hydrology

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

This definition applies to:

hydrometric project

An individual or collaborative work to monitor components of the hydrological cycle including rainfall, surface water and groundwater characteristics, as well as water quality.

This definition applies to:

hydrometry

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

This definition applies to:

hydrosols

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.

This definition applies to:

hydrostratigraphy log

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

Synonym: bore log

This definition applies to: