Frequent variations in the chemical quality of groundwater — A monitoring problem

Crabtree, 1970, Nitrate Variation in Groundwater Ronen, 1972, Nitrate Contamination of Groundwater in the Rishon Le Zion - Rehovot District, Report No. HR/72/046 Kaanovitch, 1974, Groundwater Pollution by Nitrates in Israel, Report No. 01/74/47 Schwille, 1974, Hydrogeological Studies on the Origin of High Nitrate Content in Well Waters in the Federal Republic of Germany Bar-Yoseph, 1975, Salinity Problems in the Yarkon Tanninim Aquifer, Report No. 01/75/37 Schmidt, 1977, Water Quality Variations for Pumping Wells, Ground Water, 15, 130, 10.1111/j.1745-6584.1977.tb03157.x Davison, 1978, Spatial and Temporal Hydrochemical Variations in a Semiconfiend Buried Channel Aquifer. Esterhazy, Saskatchewan, Canada, Ground Water, 16, 341, 10.1111/j.1745-6584.1978.tb03247.x Kanfi, 1976, The Chemical Quality of Groundwater in the Coastal Plain Aquifers of Israel Saffigna, 1977, Nitrate and Chloride in Groundwater Under Irrigated Agriculture in Central Wisconsin, Ground Water, 15, 170, 10.1111/j.1745-6584.1977.tb03162.x Ward, 1979, Statistical Evaluation of Sampling Frequencies in Monitoring Networks, Journal WPCF, 51, 2292 Ben-Tzvi, 1979