DU of sprinkler irrigation system

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

DU(x)

Arguments

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

Details

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

Value

Distribution Uniformity (of low quarter) in percentage

References

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

Author

Garry Grabow glgrabow@ncsu.edu

Examples

# 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
#> [1] 49.62039
durnd
#> [1] 49.62