The relation between rain movement and areal reduction of rain intensity is investigated. An approach for calculating areal reduction factors from point hyetographs and storm speed is suggested. Very good agreement is found between moving storm derived areal reduction factors and reduction factors determined using a dense net of rain gauges. Moving areal reduction factors calculated for design storms and historical storms are shown not to differ much between different cities in the Nordic countries.
Research Article|April 01 1986
Areal Reduction Factors from Rain Movement