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<br />his house. However, a significant decrease in velocity is to be expected <br /> <br />as the flow traverses the uneonfioed debris fan, flows through trees and <br /> <br />bushes (Figure 6), crosses an irrigation ditch, and encounters reduced <br /> <br />gradients. The velocity of :10.6 ft/sec (6.3 m/sec) in the lower channel <br /> <br />of Gulch B compares much more cl.osely with the 15 ft/sec (4.6 m/sec) estimate <br /> <br />of velocity near the house. However, in this case the house is located <br /> <br />on a steep gradient much closer to the, mouth of the gully. Closer agreement, <br /> <br />as observed, is to be expected in this case. The velocities reported and <br /> <br />calculated here are well within the rang" of those reported by Campbell <br /> <br />(1975) which ranged from 2 to 40 ft/see (0.6 to 12 m/sec). <br /> <br />Table 2: <br /> <br />Debris-Flow Velocities and Discharges <br /> <br />Name <br /> <br />Point Velocity Discharge <br />__--.-it / s ~~-i~~ ec ~ s (ml~,,~)_ <br /> <br />Gu 1 c h A <br /> <br />A <br />B <br />C <br /> <br />13.1 (1..0) <br />16.0 (1..9) <br />21.1 (6.4.) <br /> <br />643 (18.2) <br />1167 (33.0) <br />1285 (36.4) <br /> <br />Gu 1 c h B <br /> <br />D <br /> <br />20.6 (6.3) <br /> <br />1653 (46.8) <br /> <br />Gulch C <br /> <br />E <br />F <br />G <br /> <br />17.8 (5.4.) <br />22.9 0.0) <br />24.4 (7.1.) <br /> <br />1640 (46.4) <br />1580 (4/..7) <br />1990 (56.4) <br /> <br />Note: Reference pointo ref"r to those shown on Figure 1. <br /> <br />.- 25 - <br />