International Commission on Irrigation & Drainage Commission Interationale des Irrigation et du Drainage

Multilingual Technical Dictionary (MTD)

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Term No.Term Name/Term DescriptionAction
867
Infiltration
1 – The flow or movement of water through the surface into the soil body or ground (illustrated). 2 – The absorption of liquid water by the soil, either when it falls as rain, or when applied as irrigation, or from a stream flowing over the ground. 3 – Flow from a porous medium into a channel, pipe, drain, reservoir or conduit. 4 – The infi.....
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873
Infiltration head
The depth of water on the surface porous media which causes infiltration.
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874
Infiltration capacity
The maximum rate at which a given soil in a given condition can absorb rain as it falls, or irrigation water as it is applied......
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875
Infiltration rate
1 – The rate at which water penetrates the surface of a soil. The term is usually used to refer to water occurring as precipitation, but is also applied to water flowing or standing upon soil. 2 – The rate at which groundwater enters an infiltration ditch, gallery, drain, sewer or other underground conduit......
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878
Infiltration coefficient
The ratio of infiltration to rainfall.
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879
Infiltration index
The average rainfall intensity over and above which the mass of rainfall (the supra-rain) equals the mass runoff. Note - In the illustration : (a) time; (b) rainfall; (c) the estimated amount of infiltration occurring before the rainfall rate exceeds the infiltration rate; (d) intensity; (e) excess rainfall......
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881
Standard infiltration curve
Curve showing what the rate of infiltration would be under a standard rain condition during which the rainfall intensity continuously exceeds the infiltration rate (illustrated)......
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1016
Water of infiltration
Water that appears as the result of percolation of surface waters or atmospheric precipitation into the upper parts of the lithosphere through the small capillary pores and interstices in the rock......
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2674
Tunnel, or Temporary diversion tunnel
A passageway constructed underground, through high ground or mountains open at both ends so as to provide a path for a road, rail-road, canal, water, sewer, drain, etc. Tunnels in the context of irrigation projects (i) carry supplies of irrigation water through locations of high terrain that obstruct desirable canal routes, (ii) import supplies of .....
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2676
Free level tunnel, or Free flow tunnel
A tunnel wherein the water flows with a free water surface at atmospheric pressure.
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4150
Infiltration ditch
A man-made ditch that extends into the zone of saturation and through which water flows by gravity from the zone of saturation to the land surface or into a sump or well......
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4151
Infiltration tunnel, Infiltration gallery, or Kanat
Low gradient closed conduit (drain or tunnel) dug into an aquifer to collect groundwater by gravity flow.
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4190
Infiltration well, Diffusion well, or Dry-type recharge well
1 - Recharge well that is sunk only into the unsaturated zone, distinguished from an injection well. 2 - See 4189.
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4220
Intake of a well, Infiltration area, Seepage area, or Tributary area of the well
The area of the opening or group of openings through which water passes into the well from the water-bearing beds that it penetrates; also called the `infiltration area`, `seepage area` or `tributary area of the well`......
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4226
Drawdown, Depression head, Percolation head, or Infiltration head
1 - Lowering of the water table in an unconfined system or lowering of the piezometric surface in confined systems owing to the discharge from a well (illustrated). In percolation wells also known as `percolation head` or `infiltration head`. 2 - See 1119, and 5094......
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4988
Soil intake (infiltration) rate
Rate at which water will enter the soil under certain given conditions including soil water content.
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7438
Rapid infiltration wastewater land treatment
Reclamation of pretreated wastewater by allowing it to percolate through a permeable soil.
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8843
Kanat, Foggara, Karez (used in Baluchistan), Rhettara (used in Morocco), or Qanat (used in Iran)
Subsurface gallery for water supply starting from below the water table and sloping downwards to the ground surface with a gradient flatter than both the water table and the ground surface......
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