Describe Normal Ratio Method for estimation of missing rainfall data. The normal annual rainfall at station A, B, C and D in a catchment 770, 621, 530 and 474 mm respectively during the year 2019. The station C was out of order and annual precipitations for station A, B and D were recorded as 670, 554 and 365 mm respectively. Estimate the rainfall at station C in the year 2019.

If the normal precipitations vary considerably then Px is estimated by weighting the precipitation at various stations by the _________ ________ _________ _______ _________ ____ _________ __________ ___ ______ __________.
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