The channel system shown in Figure 4.2 can be viewed as consisting of three reaches. Subareas 1, 2, and 3 have reaches of lengths 4,940, 2,440, and 3,670 m, respectively. As it is shown in Figure 4.2 , the watershed lengths are defined as subwatershed lengths, and the length measurements for subareas 1 and 2 must be extended to the basin divide. For subwatersheds 1 and 2, the lengths are 6,810 and 4,875 m, respectively. The length of subwatershed 3 is defined as the flow path from the most distant point on the watershed divide to the outlet, and this point is the northernmost point, which is on the boundary separating subareas 2 and 3. This flow path is made up of 2,550 m of channel and 2,450 m of overland and gully flow for a total watershed length of 5,000 m. Determine the total basin length.

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Subwatershed 1, Subwatershed 2 Subwatershed 3/ FIGURE 4.2 Watershed in Example 4.1. Watershed outlet (point A)