So from DAD curves 1 day, 2 day, 3 day rainfall depths for the catchment area of the proposed project are read. 2.12 are called Depth-Area-Duration curves:Īlthough most severe storm in the listed storms may not have occurred right over the catchment under consideration there is possibility of such occurrence. Draw on a graph curves connecting area and rainfall values for different durations say 1 day rainfall, 2 day rainfall, 3 days rainfall (Refer Fig. For the listed severe storms prepare iso-hyetal maps and determine the rainfall values over the area of each isohyet (rainfall contour).ģ. From it prepare a list of most severe storms with their dates of occurrence and duration.Ģ. Also consider records of meteorologically similar regions. Examine the rainfall records of the region in which catchment area under consideration is located.
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