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Hydrology and the Neponset
Christopher A. Lynum
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(NepRWA 2004)
48 ft3
158 ft3
198 ft3
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Mosquito ditches
• Allow tides to penetrate higher into the marsh
than otherwise could
• Thought to lower marsh water table
• Mosquito ditches can naturally fill in
• Or mechanically filled as restoration effort
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Ditch plugging and filling
• Plugging: – Plugging the entry of the ditch – May require extensive maintenance
• Filling:– Can fill in using spoil if present– Perceived as more costly but likely restores a
greater area of marsh
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Ditch plugging and filling
• Need to consider other factors– Ditches in marsh elevation process– Sea Level Rise
Corman et al. 2012
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Ditch plugging and filling
• Have to maintain elevation relative to sea level rise– Resist submerging the marsh or converting to open
water– Promote natural accretion
• Determine proper elevation in relation to the tide level that will create a hydrologic regime.– Especially one where the desired vegetation is adapted
Corman et al. 2012
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• If filling affects elevation• Create new creeks using dredging techniques– Allows for flow of water further into marsh
• Case studies:– Neponset River Marsh– Broad Meadows Marsh
Dredging
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Neponset River Marsh
2005
2004
2013
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Broad Meadows Marsh2008
2013
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Questions?