A
AC 

AC pipe 

Acid 

Adhesion 

Adjusted sodium adsorption ratio 

Adsorption 

Advance Ratio 

Advance time 

Aeration 

Aeration capacity 

Aggregate 

Alfalfa valve 

Algicide 

Alkaline (alkali) soils 

Allowable depletion 

Allowable voltage loss 

Alternating current [AC] 

Ampere* 

Anion 

Aquifer 

ARC 

Area 

Atmospheric pressure 

Available soil moisture 

Available water 

B
Back flow 

Backflow prevention device [BPD] 

Back pressure 

Back siphonage 

Best management practice 

Bubbler 

Bulk density of soil 

Bulk density of water 

C
Capillary water 

Chemigation 

Class (pipe) 

Class, soil 

Clay 

Climate 

Coefficient 

Coefficient, consumptive use 

Coefficient of runoff 

Cohesion 

Continuousflow irrigation 

Control structure 

Controller 

Conveyance loss 

Coupler (sprinkler) 

Cross connection 

Crop growth stages 

Cumulative intake 

Current 

Cycle time 

D
Deep percolation 

Deficit irrigation 

Deep percolation percentage 

Degree of hazard 

Demand Irrigation 

Density 

Densogram 

Depth 

Depth of irrigation 

Diameter 

Diameter of throw 

Dielectric union 

Dimension ratio 

Direct current 

Distribution system 

Distribution uniformity 

Distribution uniformity of lower quarter 

Drought 

Dry weight 

Ductile iron 

dynamic pressure 

E
Effective precipitation 

Effective rainfall 

Efficiency 

Effluent Irrigation 

Electrical conductivity 

Emission point 

Emission uniformity 

Emitter 

Entrance loss 

Evaporation 

F
Fertigation 

FIPT 

Flow rate 

Frequency distribution 

Friable 

Friction loss 

Frost protection 

Full irrigation 

Fungicide 

Furrow 

G
Gravitational water 

Gravity 

Ground water 

Growing season 

H
Head ditch 

Head gate 

head to head spacing 

Height 

Herbicide 

High density polyethylene [HDPE] 

Horizon (soil) 

Horsepower 

Hose bib 

Hydrant 

Hydraulic conductivity 

Hydrozone 

Hygroscopic water 

I
ID 

Infiltration 

Infiltration rate (intake rate.) 

Infiltrometer 

Inrush current 

Intake family 

Intake, initial 

Intake rate 

Intake rate 

Interception 

Internal manual bleed 

Inverted siphon 

Irrecoverable water loss 

Irrigable area 

Irrigation 

Irrigation 

Irrigation audit 

Irrigation design 

irrigation frequency 

irrigation interval 

Irrigation period 

Irrigation (water) requirement 

Irrigation sagacity 

Irrigation schedule 

Irrigation set 

Irrigation slope 

Irrigation system 

K
Kinematic viscosity 

L
Lag time 

Lath box 

Leaching 

Leaching fraction [LF] {} 

Leaching requirement 

Length 

Length of run 

LEPA 

Limited irrigation 

line source 

Loam 

LPIC 

Looped circuit 

Low Energy Precision Application [LEPA] 

Low Pressure In Canopy [LPIC] 

Low head drainage 

Lysimeter 

M
Main 

Management allowable (allowed) depletion 

Manufacturer’s coefficient of variation 

Manifold 

Master valve 

Matched precipitation rate 

Matric potential 

Maximum allowable deficiency 

Maximum application rate 

Median drop size 

Microclimate 

micro irrigation 

MIPT 

Mist irrigation 

Mixed flow pump 

Moisture deficit, soil moisture depletion 

Moisture meter 

Moisture sensor 

MPT 

N
Net positive suction head 

Nominal 

Nonpoint source pollution 

Nonsaline sodic soil 

Nozzle 

Number of outlets 

Source: Irrigation Association 2014. Available: http://www.irrigation.org/defaultcontent.aspx?id=1243&terms=glossary