Evaluation of Sprinkler Irrigation Uniformity and Efficiency
Compute percentiles of area receiving less than and greater than targe...
Application efficiency of the low quarter, (AELQ) for a sprinkler irri...
Compute CU for Sprinkler Irrigation Systems
Compute distribution uniformity of lower half
DU of sprinkler irrigation system
Generate distribution plots of an array.
Summary statistics of a numeric array.
Application efficiency and adequacy of a sprinkler irrigation system
Superimpose catch can data
Potential application efficiency of low quarter for a sprinkler irriga...
Potential application efficiency of low quarter for a traveling irriga...
Plot a plan view of sprinklers and catch cans with collected depths.
Compute several levels of quantiles and interquartile range
Swap axis of ecdf plot and reverse y axis
Create step function plot (of catch can depths).
Compute CU and DU of traveling gun irrigation systems
Processing and analysis of field collected or simulated sprinkler system catch data (depths) to characterize irrigation uniformity and efficiency using standard and other measures. Standard measures include the Christiansen coefficient of uniformity (CU) as found in Christiansen, J.E.(1942, ISBN:0138779295, "Irrigation by Sprinkling"); and distribution uniformity (DU), potential efficiency of the low quarter (PELQ), and application efficiency of the low quarter (AELQ) that are implementations of measures of the same notation in Keller, J. and Merriam, J.L. (1978) "Farm Irrigation System Evaluation: A Guide for Management" <https://pdf.usaid.gov/pdf_docs/PNAAG745.pdf>. spreval::DU.lh is similar to spreval::DU but is the distribution uniformity of the low half instead of low quarter as in DU. spreval::PELQT is a version of spreval::PELQ adapted for traveling systems instead of lateral move or solid-set sprinkler systems. The function spreval::eff is analogous to the method used to compute application efficiency for furrow irrigation presented in Walker, W. and Skogerboe, G.V. (1987,ISBN:0138779295, "Surface Irrigation: Theory and Practice"),that uses piecewise integration of infiltrated depth compared against soil-moisture deficit (SMD), when the argument "target" is set equal to SMD. The other functions contained in the package provide graphical representation of sprinkler system uniformity, and other standard univariate parametric and non-parametric statistical measures as applied to sprinkler system catch depths. A sample data set of field test data spreval::catchcan (catch depths) is provided and is used in examples and vignettes. Agricultural systems emphasized, but this package can be used for landscape irrigation evaluation, and a landscape (turf) vignette is included as an example application.