GIS Problems

Estimation of the Time of Concentration with High-Resolution GIS Data: Limitations of Existing Methods and Analysis of New Methods

Differences in the calculation of the time of concentration using the velocity method result from different degrees of discretization along the longest flowpath in the watershed. We examined an idealized system for which an analytical solution could be derived. Next, we studied a dataset compiled from watersheds across the State of Maryland, for which the observed time of concentration was known.

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