Computer programs used in conjunction with monitors and parts and fittings therefor in the field of hydrology for on-site monitoring of water supplies and bodies of water; meters for measuring water level, water temperature, and water flow rate; probes for measuring water pressure and depth; data collection systems for use in the field of hydrology consisting of a sensing probe, data logger, computerized processor, user interface, and computer memory; probes for sensing and collecting hydrologic data concerning pH, contaminants and impurities; and computer programs for predicting subsurface water flow using hydrological information and for producing visual simulations of predictions made