n_engelund1967 {HYDROCAL}

Compute form roughness following Engelund and Hansen (1967)

Description

n_engelund1967 calculate Manning's n using the Engelund-Hansen (1981) method for estimating form roughness

Usage

n_engelund1967(depth, slope, d50, restrict = TRUE)

Arguments

depth

flow depth (H) in meters

slope

channel slope (S) in m/m

d50

grain size (d50) in millimeters

restrict

allows for function parameters to restrict certain values. Type bool. Default TRUE.

Value

Manning's n

References

Engelund, F., and E. Hansen. 1967. A Monograph on Sediment Transport in Alluvial Streams. Technical University of Denmark, Copenhagen, Denmark.

Examples

# Result: Manning's n of 0.049
n_engelund1967(1, 0.025, 200)

# Result: Manning's n of 0.028
n_engelund1967(5, 0.08, 90)

# Result: Manning's n of 0.053
n_engelund1967(12, 0.025, 160)