{"id":{"repo_id":"iastate","oai_identifier":"oai:dr.lib.iastate.edu:20.500.12876/JvNVPAev"},"canonical_url":"https://search.dev.ndltd.org/etd/iastate/oai:dr.lib.iastate.edu:20.500.12876/JvNVPAev","repository":{"repo_id":"iastate","name":"Iowa State University","base_url":"https://dr.lib.iastate.edu/server/oai/request"},"display":{"title":"Exploring saturated drainageways for nitrate reduction in tile-drained agricultural lands","abstract":"This study evaluates the effectiveness of a saturated grassed waterway as a nitrate (NO₃⁻N) reduction practice in agricultural landscapes. Conducted in a 130-ha field in Black Hawk County, Iowa, the research monitored flow and NO₃⁻N concentration to quantify mass loss within the drainageway. The study site featured a grassed waterway established in the 1970s, which was modified to function as a saturated buffer by diverting tile drainage into a perforated distribution line. From January to May 2024 16% of the total tile flow was diverted into the drainageway, resulting in an average infiltration rate of 0.01 m day-1. NO₃⁻N concentrations in tile drainage water ranged from 5.3 mg L-1 to 27.2 mg L-1, averaging 13.9 mg L-1. The diverted flow resulted in a significant reduction of NO₃⁻N concentrations, with a 97% decrease from the distribution line to the monitoring wells 6.5 meters away. The total mass of NO₃⁻N removed within the drainageway was 166 kg N, representing a 96% reduction in diverted load. These findings support the broader applicability of saturated drainageways as effective NO₃⁻N reduction hotspots, especially in areas with organic-rich soils. The study highlights the potential for utilizing nitrate loss hotspots in various landscape positions to improve water quality. Further research is needed to explore long-term performance and optimal design practices for these systems.","abstract_html":"This study evaluates the effectiveness of a saturated grassed waterway as a nitrate (NO₃⁻N) reduction practice in agricultural landscapes. Conducted in a 130-ha field in Black Hawk County, Iowa, the research monitored flow and NO₃⁻N concentration to quantify mass loss within the drainageway. The study site featured a grassed waterway established in the 1970s, which was modified to function as a saturated buffer by diverting tile drainage into a perforated distribution line. From January to May 2024 16% of the total tile flow was diverted into the drainageway, resulting in an average infiltration rate of 0.01 m day-1. NO₃⁻N concentrations in tile drainage water ranged from 5.3 mg L-1 to 27.2 mg L-1, averaging 13.9 mg L-1. The diverted flow resulted in a significant reduction of NO₃⁻N concentrations, with a 97% decrease from the distribution line to the monitoring wells 6.5 meters away. The total mass of NO₃⁻N removed within the drainageway was 166 kg N, representing a 96% reduction in diverted load. These findings support the broader applicability of saturated drainageways as effective NO₃⁻N reduction hotspots, especially in areas with organic-rich soils. The study highlights the potential for utilizing nitrate loss hotspots in various landscape positions to improve water quality. Further research is needed to explore long-term performance and optimal design practices for these systems.","abstract_has_math":false,"creators":["Merryman, Jennifer Rene"],"institution":"Iowa State University","degree_name":"Master of Science","degree_level":"thesis","degree_discipline":"Environmental science","degree_department":"Department of Natural Resource Ecology and Management","school":null,"contributors":[],"advisors":["Isenhart, Thomas M","Schilling, Keith E","Moore, Peter L"],"committee_chairs":[],"committee_members":[],"year":2024,"date_issued":"2024-08","date_published":"2024-08","updated_at":"2026-07-24T02:39:19Z","subjects":[],"languages":["en"],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier.doi","label":"DOI","values":["https://doi.org/10.31274/td-20250502-319"],"render_values":[{"text":"https://doi.org/10.31274/td-20250502-319","href":"https://doi.org/10.31274/td-20250502-319","code":true}]}]},"links":{"outbound_url":"https://dr.lib.iastate.edu/handle/20.500.12876/JvNVPAev","outbound_label":"Repository record","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Isenhart, Thomas M","Schilling, Keith E","Moore, Peter L"]},{"key":"dc:contributor.department","label":"Department","values":["Department of Natural Resource Ecology and Management"]},{"key":"dc:creator","label":"Author","values":["Merryman, Jennifer Rene"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2024-10-15T22:04:30Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2024-10-15T22:04:30Z"]},{"key":"dc:date.issued","label":"Date","values":["2024-08"]},{"key":"dc:type","label":"Dc Type","values":["thesis"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Environmental science"]},{"key":"thesis:degree_level","label":"Degree Level","values":["thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Master of Science"]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["Iowa State University"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["en"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.doi","label":"DOI","values":["https://doi.org/10.31274/td-20250502-319"]},{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://dr.lib.iastate.edu/handle/20.500.12876/JvNVPAev"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["This study evaluates the effectiveness of a saturated grassed waterway as a nitrate (NO₃⁻N) reduction practice in agricultural landscapes. Conducted in a 130-ha field in Black Hawk County, Iowa, the research monitored flow and NO₃⁻N concentration to quantify mass loss within the drainageway. The study site featured a grassed waterway established in the 1970s, which was modified to function as a saturated buffer by diverting tile drainage into a perforated distribution line. From January to May 2024 16% of the total tile flow was diverted into the drainageway, resulting in an average infiltration rate of 0.01 m day-1. NO₃⁻N concentrations in tile drainage water ranged from 5.3 mg L-1 to 27.2 mg L-1, averaging 13.9 mg L-1. The diverted flow resulted in a significant reduction of NO₃⁻N concentrations, with a 97% decrease from the distribution line to the monitoring wells 6.5 meters away. The total mass of NO₃⁻N removed within the drainageway was 166 kg N, representing a 96% reduction in diverted load. These findings support the broader applicability of saturated drainageways as effective NO₃⁻N reduction hotspots, especially in areas with organic-rich soils. The study highlights the potential for utilizing nitrate loss hotspots in various landscape positions to improve water quality. Further research is needed to explore long-term performance and optimal design practices for these systems."]},{"key":"dc:format.mimetype","label":"Dc Format Mimetype","values":["PDF"]},{"key":"dc:title","label":"Title","values":["Exploring saturated drainageways for nitrate reduction in tile-drained agricultural lands"]}]}],"canonical_facts":{"dc:contributor.advisor":["Isenhart, Thomas M","Schilling, Keith E","Moore, Peter L"],"dc:contributor.department":["Department of Natural Resource Ecology and Management"],"dc:creator":["Merryman, Jennifer Rene"],"dc:date.accessioned":["2024-10-15T22:04:30Z"],"dc:date.available":["2024-10-15T22:04:30Z"],"dc:date.issued":["2024-08"],"dc:description.abstract":["This study evaluates the effectiveness of a saturated grassed waterway as a nitrate (NO₃⁻N) reduction practice in agricultural landscapes. Conducted in a 130-ha field in Black Hawk County, Iowa, the research monitored flow and NO₃⁻N concentration to quantify mass loss within the drainageway. The study site featured a grassed waterway established in the 1970s, which was modified to function as a saturated buffer by diverting tile drainage into a perforated distribution line. From January to May 2024 16% of the total tile flow was diverted into the drainageway, resulting in an average infiltration rate of 0.01 m day-1. NO₃⁻N concentrations in tile drainage water ranged from 5.3 mg L-1 to 27.2 mg L-1, averaging 13.9 mg L-1. The diverted flow resulted in a significant reduction of NO₃⁻N concentrations, with a 97% decrease from the distribution line to the monitoring wells 6.5 meters away. The total mass of NO₃⁻N removed within the drainageway was 166 kg N, representing a 96% reduction in diverted load. These findings support the broader applicability of saturated drainageways as effective NO₃⁻N reduction hotspots, especially in areas with organic-rich soils. The study highlights the potential for utilizing nitrate loss hotspots in various landscape positions to improve water quality. Further research is needed to explore long-term performance and optimal design practices for these systems."],"dc:format.mimetype":["PDF"],"dc:identifier.doi":["https://doi.org/10.31274/td-20250502-319"],"dc:identifier.uri":["https://dr.lib.iastate.edu/handle/20.500.12876/JvNVPAev"],"dc:language.iso":["en"],"dc:title":["Exploring saturated drainageways for nitrate reduction in tile-drained agricultural lands"],"dc:type":["thesis"],"thesis:degree_discipline":["Environmental science"],"thesis:degree_level":["thesis"],"thesis:degree_name":["Master of Science"],"thesis:institution_name":["Iowa State University"]},"updated_at":"2026-07-24T02:39:19Z"}