{"id":{"repo_id":"vt","oai_identifier":"oai:vtechworks.lib.vt.edu:10919/70551"},"canonical_url":"https://search.dev.ndltd.org/etd/vt/oai:vtechworks.lib.vt.edu:10919/70551","repository":{"repo_id":"vt","name":"Virginia Tech","base_url":"https://vtechworks.lib.vt.edu/oai/request"},"display":{"title":"Sources and yields of nutrient and organic loadings in the Roanoke River Basin above Smith Mountain Lake, Virginia","abstract":"Sources and yields of nutrient and organic loadings in the Upper Roanoke River Basin were investigated during the summer low flow period of 1971. Parameters monitored at sampling stations in the basin included biochemical oxygen demand, chemical oxygen demand, total organic carbon, total phosphate, orthophosphate, Total Kjeldahl Nitrogen, nitrate nitrogen, sodium, potassium, calcium, and magnesium. These data were used in conjunction with flow and drainage area data to determine the relative magnitude and daily yields of nutrient and organic yields from various sources. Sources of nutrient and organic materials entering the basin included rural and urban land drainage, and domestic and industrial wastewater effluents. The yields of materials from the various sources were computed in order to determine the magnitude of each in contributing to the fertilization of Smith Mountain Lake. The domestic wastewater effluents were found to be the prime contributors of organic carbon, nitrogen, and phosphorus in the upper basin. Urban land drainage was found to be the major runoff source of· phosphorus, while rural land found to be the greatest drainage source of nitrogen. It was found that diversion of all wastewater effluents 'in the tributary watershed would not reduce the concentration.of macronutrients in the Roanoke River flow to the levels generally promulgated as being adequate to support excessive productivity in lenitic aquatic environments.","abstract_html":"Sources and yields of nutrient and organic loadings in the Upper Roanoke River Basin were investigated during the summer low flow period of 1971. Parameters monitored at sampling stations in the basin included biochemical oxygen demand, chemical oxygen demand, total organic carbon, total phosphate, orthophosphate, Total Kjeldahl Nitrogen, nitrate nitrogen, sodium, potassium, calcium, and magnesium. These data were used in conjunction with flow and drainage area data to determine the relative magnitude and daily yields of nutrient and organic yields from various sources. Sources of nutrient and organic materials entering the basin included rural and urban land drainage, and domestic and industrial wastewater effluents. The yields of materials from the various sources were computed in order to determine the magnitude of each in contributing to the fertilization of Smith Mountain Lake. The domestic wastewater effluents were found to be the prime contributors of organic carbon, nitrogen, and phosphorus in the upper basin. Urban land drainage was found to be the major runoff source of· phosphorus, while rural land found to be the greatest drainage source of nitrogen. It was found that diversion of all wastewater effluents 'in the tributary watershed would not reduce the concentration.of macronutrients in the Roanoke River flow to the levels generally promulgated as being adequate to support excessive productivity in lenitic aquatic environments.","abstract_has_math":false,"creators":["Grizzard, Thomas J."],"institution":"Virginia Polytechnic Institute and State University","degree_name":"Master of Science","degree_level":"masters","degree_discipline":"Sanitary Engineering","degree_department":"Sanitary Engineering","school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":1972,"date_issued":"1972","date_published":"1972","updated_at":"2026-07-22T22:19:49Z","subjects":[],"languages":["en"],"rights":["In Copyright"],"rights_urls":["http://rightsstatements.org/vocab/InC/1.0/"],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/10919/70551","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.department","label":"Department","values":["Sanitary Engineering"]},{"key":"dc:creator","label":"Author","values":["Grizzard, Thomas J."]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2016-04-21T15:35:18Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2016-04-21T15:35:18Z"]},{"key":"dc:date.issued","label":"Date","values":["1972"]},{"key":"dc:publisher","label":"Institution","values":["Virginia Polytechnic Institute and State University"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]},{"key":"dc:type.dcmitype","label":"Dc Type Dcmitype","values":["Text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Sanitary Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["masters"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Master of Science"]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["Virginia Polytechnic Institute and State University"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["In Copyright"]},{"key":"dc:rights.uri","label":"Rights URI","values":["http://rightsstatements.org/vocab/InC/1.0/"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["http://hdl.handle.net/10919/70551"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["Sources and yields of nutrient and organic loadings in the Upper Roanoke River Basin were investigated during the summer low flow period of 1971. Parameters monitored at sampling stations in the basin included biochemical oxygen demand, chemical oxygen demand, total organic carbon, total phosphate, orthophosphate, Total Kjeldahl Nitrogen, nitrate nitrogen, sodium, potassium, calcium, and magnesium. These data were used in conjunction with flow and drainage area data to determine the relative magnitude and daily yields of nutrient and organic yields from various sources. Sources of nutrient and organic materials entering the basin included rural and urban land drainage, and domestic and industrial wastewater effluents. The yields of materials from the various sources were computed in order to determine the magnitude of each in contributing to the fertilization of Smith Mountain Lake. The domestic wastewater effluents were found to be the prime contributors of organic carbon, nitrogen, and phosphorus in the upper basin. Urban land drainage was found to be the major runoff source of· phosphorus, while rural land found to be the greatest drainage source of nitrogen. It was found that diversion of all wastewater effluents 'in the tributary watershed would not reduce the concentration.of macronutrients in the Roanoke River flow to the levels generally promulgated as being adequate to support excessive productivity in lenitic aquatic environments."]},{"key":"dc:description.degree","label":"Dc Description Degree","values":["Master of Science"]},{"key":"dc:format.mimetype","label":"Dc Format Mimetype","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Sources and yields of nutrient and organic loadings in the Roanoke River Basin above Smith Mountain Lake, Virginia"]}]}],"canonical_facts":{"dc:contributor.department":["Sanitary Engineering"],"dc:creator":["Grizzard, Thomas J."],"dc:date.accessioned":["2016-04-21T15:35:18Z"],"dc:date.available":["2016-04-21T15:35:18Z"],"dc:date.issued":["1972"],"dc:description.abstract":["Sources and yields of nutrient and organic loadings in the Upper Roanoke River Basin were investigated during the summer low flow period of 1971. Parameters monitored at sampling stations in the basin included biochemical oxygen demand, chemical oxygen demand, total organic carbon, total phosphate, orthophosphate, Total Kjeldahl Nitrogen, nitrate nitrogen, sodium, potassium, calcium, and magnesium. These data were used in conjunction with flow and drainage area data to determine the relative magnitude and daily yields of nutrient and organic yields from various sources. Sources of nutrient and organic materials entering the basin included rural and urban land drainage, and domestic and industrial wastewater effluents. The yields of materials from the various sources were computed in order to determine the magnitude of each in contributing to the fertilization of Smith Mountain Lake. The domestic wastewater effluents were found to be the prime contributors of organic carbon, nitrogen, and phosphorus in the upper basin. Urban land drainage was found to be the major runoff source of· phosphorus, while rural land found to be the greatest drainage source of nitrogen. It was found that diversion of all wastewater effluents 'in the tributary watershed would not reduce the concentration.of macronutrients in the Roanoke River flow to the levels generally promulgated as being adequate to support excessive productivity in lenitic aquatic environments."],"dc:description.degree":["Master of Science"],"dc:format.mimetype":["application/pdf"],"dc:identifier.uri":["http://hdl.handle.net/10919/70551"],"dc:language.iso":["en"],"dc:publisher":["Virginia Polytechnic Institute and State University"],"dc:rights":["In Copyright"],"dc:rights.uri":["http://rightsstatements.org/vocab/InC/1.0/"],"dc:title":["Sources and yields of nutrient and organic loadings in the Roanoke River Basin above Smith Mountain Lake, Virginia"],"dc:type":["Thesis"],"dc:type.dcmitype":["Text"],"thesis:degree_discipline":["Sanitary Engineering"],"thesis:degree_level":["masters"],"thesis:degree_name":["Master of Science"],"thesis:institution_name":["Virginia Polytechnic Institute and State University"]},"updated_at":"2026-07-22T22:19:49Z"}