How to Calculate Antecedent Precipitation Index?
Antecedent Precipitation Index calculator uses Antecedent Precipitation Index = Coefficient 'a'*Precipitation in (i)th Year+Coefficient 'b'*Precipitation in (i-1)th Year+Coefficient 'c'*Precipitation in (i-2)th Year to calculate the Antecedent Precipitation Index, The Antecedent Precipitation Index formula is defined as the precipitation falling before, but influencing the runoff yields of, a given rainfall event. Antecedent Precipitation Index is denoted by Pa symbol.
How to calculate Antecedent Precipitation Index using this online calculator? To use this online calculator for Antecedent Precipitation Index, enter Coefficient 'a' (a), Precipitation in (i)th Year (Pi), Coefficient 'b' (b), Precipitation in (i-1)th Year (P(i-1)), Coefficient 'c' (c) & Precipitation in (i-2)th Year (P(i-2)) and hit the calculate button. Here is how the Antecedent Precipitation Index calculation can be explained with given input values -> 9639 = 0.79*0.95+0.1*1.21+0.11*0.84.