The correct answer is A. Kinchling.
The rational formula Q = 0.0278 KpA was evolved by Kinchling in 1965. It is
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Q = 0.0278 KpA
where:
Q = peak runoff (m3/s)
K = drainage area (km2)
p = rainfall intensity (mm/h)
A = drainage area (km2)
The formula is valid for drainage areas up to 100 km2. For larger drainage areas, the formula should be modified to account for the effects of channel storage.
The formula has been widely used in the United States and other countries. It is a simple and easy-to-use formula that provides a good estimate of the peak runoff from a storm.
The other options are incorrect. Lloyd Davis and Frubling did not develop the rational formula.