2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/23/2018 | 10:15 AM - 10:30 AM | BREAKING BARRIERS: LEGACY PHOSPHORUS MONITORING DURING RESTORATION AND BERM REMOVAL FOR HYDROLOGIC RECONNECTION OF FLOODED AGRICULTURAL FIELDS TO THE WATERSHED | 420 B
BREAKING BARRIERS: LEGACY PHOSPHORUS MONITORING DURING RESTORATION AND BERM REMOVAL FOR HYDROLOGIC RECONNECTION OF FLOODED AGRICULTURAL FIELDS TO THE WATERSHED
Bear Creek is the major tributary of Bear Lake, which is part of the Muskegon Lake Area of Concern (AOC). Excess nutrient concentrations and wetland habitat loss are two beneficial use impairments still in need of remediation. Two flooded former agricultural muck fields, now serving as flooded ponds and separated from Bear Creek by earthen berms, were identified for wetland restoration and hydrologic reconnection to Bear Creek to increase AOC wetland acreage. Pond sediment was dredged before reconnection to minimize release of sequestered legacy sediment P.
We monitored Bear Creek and the ponds before and after dredging and berm removal. Post-restoration Bear Creek soluble reactive P concentrations were lower downstream of ponds than upstream and total phosphorus (TP) concentrations in one pond were reduced to ~3% of pre-restoration means; however, post-restoration TP values occasionally exceeded Bear Lake’s total maximum daily load goal of 30 µg P/L. Sediment isotherm and porewater analyses indicate although sediment P concentrations have been greatly reduced, the former ponds remain sources of P to the water column. These results build upon previous research promoting dredging as one potential tool for reducing sediment P loads from wetlands.
- Phosphorous
- Sediment
- Wetland
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Presenters/Authors
Michael Hassett
(), Annis Water Resources Institute - Grand Valley State University, hassetmi@gvsu.edu;
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Maggie Oudsema
(), Grand Valley State University - Annis Water Resources Institute, oudsemam@gvsu.edu;
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Kim Oldenborg
(), Annis Water Resources Institute-Grand Valley State University , oldenbok@mail.gvsu.edu;
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Alan Steinman
(), Annis Water Resources Institute-Grand Valley State University, steinmaa@gvsu.edu;
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