Calculate the head loss, Calculating head loss in a stream

Calculate the head loss

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Reference no: EM132339109

Question - Calculating head loss in a stream

The ability of a stream to cause erosion can be dissipated as it loses energy while moving downstream. This loss of energy is described as head loss, h_L, and is a function of the channel roughness (n), shape (R_H) and velocity. As shown, this value is dimensionless, or ft/ft. The h_L value is "head loss per section of stream". So, you would need to multiply the h_L by L, length of channel, to get total head loss for a length of stream.

h_L = n(1/4R_H)(V²/2g)

The above trapezoidal channel is a dredged (excavated) channel, and it is flowing at a rate of 800 cfs. For values of n, use Table 6.1 in text.

Calculate the head loss (ft) for the following two scenarios:

a. Channel not maintained, with overgrown weeds, brush.

b. Earth packed, straight and clean, with no weeds or brush.

Reference no: EM132339109

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