BCR

Benefit Cost Ratio

Bi

Benefit flow of the i year

Ci

Cost flow of the i year

D

Inside diameter of the pipe

Є

Electrical efficiency

Eh

Hydraulic energy

ea

Actual vapor pressure

es

Saturated vapor pressure at air temperature

Esi

Space between emitter or sprinkler

Etc

Crop evapotranspiration

Eto

Reference evapotranspiration

f

Darcy-Weisbach resistance coefficient

FC

Field Capa city

G

Soil heat flux density

g

Gavitational acceleration

GIR

Gross Irrigation Requirement

Hd

Dynamic high

Hp

Pressure head

Hem

Pressure needed at the emitter

hf

Head loss

hf1

Head loss from the pump to the most unfavorable supply inlet

hf2

Head loss from the inlet to the most unfavorable emitter

Ho

Number of hours of operating time

IRR

Internal Rate of Return

J

head losses in percentage

Kc

Crop coefficient

L

Pipe length

ρ

Water density

Lli

Lateral length

Lri

Mainline length

Lsi

Space between lateral

n

Time frame of the project

NIR

Net irrigation requirement

ηpum

Overall pumping plant efficiency

NPV

Net Present Value

PBP

Payback Period

Peff

Effective rainfall