– Select from preset zones (tropical wet/dry, temperate, arid) or enter site-specific monthly rainfall.
The answer, for over 30 years, has largely rested on a powerful analytical tool: . hdm-4 software
– Specify the discount rate and analysis period. Run the comparison of strategies. The software produces tables of NPV, EIRR, and benefit-cost ratios. – Select from preset zones (tropical wet/dry, temperate,