{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/46697"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/46697","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Suspended sediment and total phosphorus loadings from small agricultural watersheds in western Illinois","abstract":"On larger rivers, instantaneous sample concentrations are often treated as being representative of the mean daily concentration for load calculation purposes. This assumption, however, is not appropriate on streams where concentrations can change substantially within a day. In five small, rural watersheds in western Illinois, the collection and analysis of data during runoff events was done on a sub-daily time step. To have accurate load estimates, the selected load calculation method should correctly characterize loading behavior during short duration runoff events. The use of statistical models with residuals-based error correction (i.e. the composite method) has become an increasingly popular technique for load calculations. This study is an application of error corrected regression models to compute continuous records of suspended sediment and total phosphorus concentrations at five watersheds in western Illinois. Due to the small drainage areas of the studied streams, all regression models were developed and applied using a 15-minute time-step. Four methods of constructing continuous concentration records were compared, and the best method to compute sediment and phosphorus loads for a 10-year period of study was identified. For both suspended sediment and total phosphorus, load calculations by error corrected regression models produced estimates that were the most precise and least biased. Further, the method of error correction was not as critical as the act of error correction itself. During the ten-year study period, 5% of the record accounted for approximately 50% of the flow, 91% of the total phosphorus load and more than 96% of the sediment load. On average, the 1-day maximum accounted for 10% of annual flow and more than 30% of annual sediment and phosphorus loads.","abstract_html":"On larger rivers, instantaneous sample concentrations are often treated as being representative of the mean daily concentration for load calculation purposes. This assumption, however, is not appropriate on streams where concentrations can change substantially within a day. In five small, rural watersheds in western Illinois, the collection and analysis of data during runoff events was done on a sub-daily time step. To have accurate load estimates, the selected load calculation method should correctly characterize loading behavior during short duration runoff events. The use of statistical models with residuals-based error correction (i.e. the composite method) has become an increasingly popular technique for load calculations. This study is an application of error corrected regression models to compute continuous records of suspended sediment and total phosphorus concentrations at five watersheds in western Illinois. Due to the small drainage areas of the studied streams, all regression models were developed and applied using a 15-minute time-step. Four methods of constructing continuous concentration records were compared, and the best method to compute sediment and phosphorus loads for a 10-year period of study was identified. For both suspended sediment and total phosphorus, load calculations by error corrected regression models produced estimates that were the most precise and least biased. Further, the method of error correction was not as critical as the act of error correction itself. During the ten-year study period, 5% of the record accounted for approximately 50% of the flow, 91% of the total phosphorus load and more than 96% of the sediment load. On average, the 1-day maximum accounted for 10% of annual flow and more than 30% of annual sediment and phosphorus loads.","abstract_has_math":false,"creators":["Russell, Amy M."],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Agricultural & Biological Engr","degree_department":null,"school":null,"contributors":["Cooke, Richard A."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2014,"date_issued":"2014-01-16T17:59:31Z","date_published":"2014-01-16T17:59:31Z","updated_at":"2026-07-22T22:25:36Z","subjects":["load calculation","regression","sediment","phosphorus"],"languages":["en"],"rights":["Copyright 2013 Amy Russell"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/46697","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Cooke, Richard A."]},{"key":"dc:creator","label":"Author","values":["Russell, Amy M."]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2014-01-16T17:59:31Z","2013-12"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Agricultural & Biological Engr"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M.S."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["load calculation","regression","sediment","phosphorus"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2013 Amy Russell"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/46697"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["On larger rivers, instantaneous sample concentrations are often treated as being representative of the mean daily concentration for load calculation purposes. This assumption, however, is not appropriate on streams where concentrations can change substantially within a day. In five small, rural watersheds in western Illinois, the collection and analysis of data during runoff events was done on a sub-daily time step. To have accurate load estimates, the selected load calculation method should correctly characterize loading behavior during short duration runoff events. The use of statistical models with residuals-based error correction (i.e. the composite method) has become an increasingly popular technique for load calculations. This study is an application of error corrected regression models to compute continuous records of suspended sediment and total phosphorus concentrations at five watersheds in western Illinois. Due to the small drainage areas of the studied streams, all regression models were developed and applied using a 15-minute time-step. Four methods of constructing continuous concentration records were compared, and the best method to compute sediment and phosphorus loads for a 10-year period of study was identified. For both suspended sediment and total phosphorus, load calculations by error corrected regression models produced estimates that were the most precise and least biased. Further, the method of error correction was not as critical as the act of error correction itself. During the ten-year study period, 5% of the record accounted for approximately 50% of the flow, 91% of the total phosphorus load and more than 96% of the sediment load. On average, the 1-day maximum accounted for 10% of annual flow and more than 30% of annual sediment and phosphorus loads.","Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2013-12-09T14:33:43Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 1 Russell_Amy.pdf: 3149071 bytes, checksum: 68da4b46d2c571bc48716fa3ee2aeb79 (MD5)","Made available in DSpace on 2014-01-16T17:59:31Z (GMT). No. of bitstreams: 2 Amy_Russell.pdf: 3149071 bytes, checksum: 68da4b46d2c571bc48716fa3ee2aeb79 (MD5) license.txt: 4060 bytes, checksum: 11b100d3fdbce91b29b1d7e0a298fd4c (MD5)"]},{"key":"dc:title","label":"Title","values":["Suspended sediment and total phosphorus loadings from small agricultural watersheds in western Illinois"]}]}],"canonical_facts":{"dc:contributor":["Cooke, Richard A."],"dc:creator":["Russell, Amy M."],"dc:date":["2014-01-16T17:59:31Z","2013-12"],"dc:description":["On larger rivers, instantaneous sample concentrations are often treated as being representative of the mean daily concentration for load calculation purposes. This assumption, however, is not appropriate on streams where concentrations can change substantially within a day. In five small, rural watersheds in western Illinois, the collection and analysis of data during runoff events was done on a sub-daily time step. To have accurate load estimates, the selected load calculation method should correctly characterize loading behavior during short duration runoff events. The use of statistical models with residuals-based error correction (i.e. the composite method) has become an increasingly popular technique for load calculations. This study is an application of error corrected regression models to compute continuous records of suspended sediment and total phosphorus concentrations at five watersheds in western Illinois. Due to the small drainage areas of the studied streams, all regression models were developed and applied using a 15-minute time-step. Four methods of constructing continuous concentration records were compared, and the best method to compute sediment and phosphorus loads for a 10-year period of study was identified. For both suspended sediment and total phosphorus, load calculations by error corrected regression models produced estimates that were the most precise and least biased. Further, the method of error correction was not as critical as the act of error correction itself. During the ten-year study period, 5% of the record accounted for approximately 50% of the flow, 91% of the total phosphorus load and more than 96% of the sediment load. On average, the 1-day maximum accounted for 10% of annual flow and more than 30% of annual sediment and phosphorus loads.","Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2013-12-09T14:33:43Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 1 Russell_Amy.pdf: 3149071 bytes, checksum: 68da4b46d2c571bc48716fa3ee2aeb79 (MD5)","Made available in DSpace on 2014-01-16T17:59:31Z (GMT). No. of bitstreams: 2 Amy_Russell.pdf: 3149071 bytes, checksum: 68da4b46d2c571bc48716fa3ee2aeb79 (MD5) license.txt: 4060 bytes, checksum: 11b100d3fdbce91b29b1d7e0a298fd4c (MD5)"],"dc:identifier":["http://hdl.handle.net/2142/46697"],"dc:language":["en"],"dc:rights":["Copyright 2013 Amy Russell"],"dc:subject":["load calculation","regression","sediment","phosphorus"],"dc:title":["Suspended sediment and total phosphorus loadings from small agricultural watersheds in western Illinois"],"dc:type":["text"],"thesis:degree_discipline":["Agricultural & Biological Engr"],"thesis:degree_level":["Thesis"],"thesis:degree_name":["M.S."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:25:36Z"}