spreval (version 1.1.0)

DU: DU of sprinkler irrigation system

Description

Computes DU (distribution uniformity of low quarter) for sprinkler systems using catch can data.

Usage

DU(x)

Arguments

x

numeric array of catch can data. Array may include missing (NA) data. NA values will be removed in function.

Value

Distribution Uniformity (of low quarter) in percentage

Details

mean of lowest quarter of observations divided by overall mean X 100

References

Keller, J., and R. D. Bliesner. 2000. Sprinkler and Trickle Irrigation. Caldwell, N.J.: Blackburn Press. ISBN 1-930665-19-9.

See Also

CU,DU.lh

Examples

# NOT RUN {
# data below are volumes caught in ml.  Catch cans must be of
# equal surface area at top when using volume data
x<-c(47,42,45,24,13,26,33,34,27,30,40,44,32,12,12)
xdu<-DU(x)
#round results
durnd<-round(xdu,2)
xdu
durnd

# }