We acknowledge and appreciate useful discussions with Dr. James A. Smith from Princeton University and Dr. Dong-Jun Seo from the Office of Hydrology of the National Weather Service. We also thank Tim O’Bannon, Operational Support Facility of the National Weather Service, and the two anonymous reviewers for their helpful comments on the original manuscript. This study was supported by the National Weather Service, under a cooperative agreement between the Office of Hydrology of the National Weather Service and the Iowa Institute of Hydraulic Research. It was also supported by NASA under Grant NAG-5-2094.
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