{"id":61,"date":"2021-06-21T21:09:53","date_gmt":"2021-06-21T21:09:53","guid":{"rendered":"https:\/\/books.gw-project.org\/septic-system-impacts-on-groundwater-quality\/chapter\/exercise-1\/"},"modified":"2021-06-22T21:24:24","modified_gmt":"2021-06-22T21:24:24","slug":"exercise-1","status":"publish","type":"chapter","link":"https:\/\/books.gw-project.org\/septic-system-impacts-on-groundwater-quality\/chapter\/exercise-1\/","title":{"raw":"Exercise 1","rendered":"Exercise 1"},"content":{"raw":"<div class=\"exercise-1\">\r\n<p class=\"import-Normal\">You are thinking about purchasing a home in a rural area that has water supplied from a well that is screened over an interval 5 to 7 m below the water table. Upgradient from the property, there is a roadside motel\/restaurant complex that is serviced by a septic system. You are concerned about potential for contamination of the well, so you have accessed the building permit records, and determined that the septic system drainfield is 30 m x 30 m in area with the downgradient edge located 300 m from the well. The drainfield is designed for wastewater loading of 1 cm\/day (365 cm\/yr). The site is underlain by a regional unconfined sand aquifer that has an average linear groundwater velocity of 100 m\/yr. Precipitation, in this area, averages 90 cm\/yr. Water balance calculations for a local river basin have established that evapotranspiration averages 60 cm\/yr. Assuming that the aquifer has a saturated porosity of 0.3, and has sufficiently high transmissivity that pumping from the well does not materially alter flow paths, should I be concerned about the potential for contamination from the upgradient motel\/ restaurant septic system?<\/p>\r\n<p class=\"import-Normal\" style=\"text-align: right;\"><a href=\"https:\/\/books.gw-project.org\/septic-system-impacts-on-groundwater-quality\/chapter\/solution-exercise-1\/\"><span class=\"import-Hyperlink\">Click for solution to exercise 1<\/span><\/a><\/p>\r\n\r\n<\/div>","rendered":"<div class=\"exercise-1\">\n<p class=\"import-Normal\">You are thinking about purchasing a home in a rural area that has water supplied from a well that is screened over an interval 5 to 7 m below the water table. Upgradient from the property, there is a roadside motel\/restaurant complex that is serviced by a septic system. You are concerned about potential for contamination of the well, so you have accessed the building permit records, and determined that the septic system drainfield is 30 m x 30 m in area with the downgradient edge located 300 m from the well. The drainfield is designed for wastewater loading of 1 cm\/day (365 cm\/yr). The site is underlain by a regional unconfined sand aquifer that has an average linear groundwater velocity of 100 m\/yr. Precipitation, in this area, averages 90 cm\/yr. Water balance calculations for a local river basin have established that evapotranspiration averages 60 cm\/yr. Assuming that the aquifer has a saturated porosity of 0.3, and has sufficiently high transmissivity that pumping from the well does not materially alter flow paths, should I be concerned about the potential for contamination from the upgradient motel\/ restaurant septic system?<\/p>\n<p class=\"import-Normal\" style=\"text-align: right;\"><a href=\"https:\/\/books.gw-project.org\/septic-system-impacts-on-groundwater-quality\/chapter\/solution-exercise-1\/\"><span class=\"import-Hyperlink\">Click for solution to exercise 1<\/span><\/a><\/p>\n<\/div>\n","protected":false},"author":1,"menu_order":12,"template":"","meta":{"pb_show_title":"on","pb_short_title":"","pb_subtitle":"","pb_authors":[],"pb_section_license":""},"chapter-type":[],"contributor":[],"license":[],"class_list":["post-61","chapter","type-chapter","status-publish","hentry"],"part":181,"_links":{"self":[{"href":"https:\/\/books.gw-project.org\/septic-system-impacts-on-groundwater-quality\/wp-json\/pressbooks\/v2\/chapters\/61","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/books.gw-project.org\/septic-system-impacts-on-groundwater-quality\/wp-json\/pressbooks\/v2\/chapters"}],"about":[{"href":"https:\/\/books.gw-project.org\/septic-system-impacts-on-groundwater-quality\/wp-json\/wp\/v2\/types\/chapter"}],"author":[{"embeddable":true,"href":"https:\/\/books.gw-project.org\/septic-system-impacts-on-groundwater-quality\/wp-json\/wp\/v2\/users\/1"}],"version-history":[{"count":3,"href":"https:\/\/books.gw-project.org\/septic-system-impacts-on-groundwater-quality\/wp-json\/pressbooks\/v2\/chapters\/61\/revisions"}],"predecessor-version":[{"id":213,"href":"https:\/\/books.gw-project.org\/septic-system-impacts-on-groundwater-quality\/wp-json\/pressbooks\/v2\/chapters\/61\/revisions\/213"}],"part":[{"href":"https:\/\/books.gw-project.org\/septic-system-impacts-on-groundwater-quality\/wp-json\/pressbooks\/v2\/parts\/181"}],"metadata":[{"href":"https:\/\/books.gw-project.org\/septic-system-impacts-on-groundwater-quality\/wp-json\/pressbooks\/v2\/chapters\/61\/metadata\/"}],"wp:attachment":[{"href":"https:\/\/books.gw-project.org\/septic-system-impacts-on-groundwater-quality\/wp-json\/wp\/v2\/media?parent=61"}],"wp:term":[{"taxonomy":"chapter-type","embeddable":true,"href":"https:\/\/books.gw-project.org\/septic-system-impacts-on-groundwater-quality\/wp-json\/pressbooks\/v2\/chapter-type?post=61"},{"taxonomy":"contributor","embeddable":true,"href":"https:\/\/books.gw-project.org\/septic-system-impacts-on-groundwater-quality\/wp-json\/wp\/v2\/contributor?post=61"},{"taxonomy":"license","embeddable":true,"href":"https:\/\/books.gw-project.org\/septic-system-impacts-on-groundwater-quality\/wp-json\/wp\/v2\/license?post=61"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}