Table 1 - Saturation vapour pressure of water
𝑒𝑤 = 4.584 exp (
17.27𝑡
) 𝑚𝑚 𝑜𝑓 𝐻𝑔, 𝑤ℎ𝑒𝑟𝑒 𝑡 = 𝑡𝑒𝑚𝑝𝑒𝑟𝑎𝑡𝑢𝑟𝑒 𝑖𝑛 ℃
237.3 + 𝑡
Table 2 - Mean monthly solar radiation at top of atmosphere Ha in mm of evaporable water/day
Table 3 - Mean monthly values of possible sunshine hours, N