Irrigation Water Requirements Part 2 Penman Monteith Implementation

Irrigation Water Requirements What it does Monthly and seasonal irrigation water requirements Peak ET values What it doesn’t do It’s not a scheduler It doesn’t calculate daily ET values

Overview of IWR Strictly in conformance with USDA-NRCS NEH Part 623 Chapter 2 Irrigation Water Requirements IWR can calculate evapo-transpiration using two methods: FAO 56 Penman Monteith SCS Blaney Criddle (TR-21) Strictly in conformance with USDA-NRCS NEH Part 623 Chapter 2 Irrigation Water Requirements IWR can calculate evapo-transpiration using three methods: Temperature Radiation SCS Blaney Criddle (TR-21)

What IWR does IWR implements procedures for computing monthly and seasonal irrigation water requirements. It is not capable of making daily irrigation water requirement estimates

Data Requirements The TR-21 method uses average monthly temperature and average monthly precipitation The temperature and radiation methods require additional data: humidity wind solar radiation

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