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 |