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Analysis of the Tokai-storm DAD curves Pa= a ⋅t0.5Japan’s maximum DADenvelope curves: u=0.0248 v=0.414 n=0.5exp(nu t A )−v− ⋅ ⋅It became the closest to Japan’s maximum DAD features around t6hr. General features of a certain event’s optimized DAD curves are:v is large and u is small. Areal rainfall decreasing rate with areabecomes higher as the duration gets longer. The unique feature of optimized DAD curves for the Tokai rainstorm isn is small. Areal rainfall decreasing rate with area is relatively small. DAD characteristics can be assessed quantitatively with the expanded Horton formula.