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curve number, which along with longest flow path and slope, is used to calculate the lag time of the watershed.

Figure 3.1: Watershed Parameters

3.2

CASE I: TRADITIONAL METHODS

Traditional hydrologic modeling involves calculating watershed

parameters based on a paper map. Two instruments, a planimeter and a map

wheel, aid in this process.

Traditional methods of computing terrain-based hydrologic data involve

delineating the watershed by hand using map contours as guidelines. This is a

very time consuming process, as drainage divides may be hard to locate. Pencil

27

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