Record Display for the EPA National Library Catalog


Main Title Disjunctive Kriging as an Approach to Management Decision Making.
Author Yates, S. R. ; Yates, M. V. ;
CORP Author California Univ., Riverside. Dept. of Soil and Environmental Sciences.;Robert S. Kerr Environmental Research Lab., Ada, OK.
Publisher c1988
Year Published 1988
Report Number EPA/600/J-88/431;
Stock Number PB90-113473
Additional Subjects Soil science ; Hydrology ; Decision making ; Management ; Estimating ; Septic tanks ; Ground water ; Reprints ; Disjunctive kriging
Library Call Number Additional Info Location Last
NTIS  PB90-113473 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 8p
Disjunctive kriging is a nonlinear estimation technique that allows the conditional probability that the value of a spatially variable management parameter is greater than a cutoff level to be calculated. The method can be used in management decision making to help determine when some reclamation action is necessary. Two input parameters are required to use the technique: a cutoff level and the critical probability level. The use of disjunctive kriging as a decision making tool is illustrated using the regulation of septic setback distance as a means for minimizing the contamination of groundwater by viruses. Two examples are described: given a setback distance, the spatial distribution of the conditional probability that the virus concentration will be greater than acceptable levels is calculated; and given a critical probability level, calculating the spatial distribution of setback distances which satisfy that probability level. The study showed that, to be 90% confident that virus concentrations would be within acceptable limits, in many areas the setback distance would have to be severalfold higher than prescribed by current regulations.