HYDROCAL (version 1.0.0)

n_limerinos1970: Compute grain roughness following Limerinos (1970)

Description

n_limerinos1970 calculate Manning's n using the Limerinos (1970) method for estimating grain roughness

Usage

n_limerinos1970(radius, grain, restrict = TRUE)

Value

Manning's n

Arguments

radius

hydraulic radius (R) in meters. The original model was calibrated for 0.31 m < R < 3.32 m.

grain

grain size (d84) in millimeters. The original model was calibrated for 19 mm < d84 < 747 mm

restrict

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

References

Limerinos, J. T. 1970. Determination of the Manning Coefficient from Measured Bed Roughness in Natural Channels. Water Supply Paper 1898-B. USGS, Washington, DC.

Examples

# Result: Manning's n of 0.036
n_limerinos1970(1,100)

# Result: Manning's n of 0.031
n_limerinos1970(2.5,70)

# Result: Manning's n of 0.039
n_limerinos1970(3,200)

# Result: Manning's n of 0.039
n_limerinos1970(3,200)

# Result: Grain must be within 19 and 747 mm.
n_limerinos1970(3,1000)