Computerized groundwater-flow models provide scientific analysis of water resources. Since its initial development in 2014, the Columbia County groundwater-flow model has been used to respond to requests for information about specific groundwater and land use issues. This companion report to the Hydrogeology and simulation of groundwater flow in Columbia County, Wisconsin (Bulletin 117) demonstrates several of these model applications. Examples include simulating the effects of pumping from a new irrigation well and assessing groundwater flow patterns near an industrial facility.