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Description: Eelgrass 1980 - NH Fish and Game DepartmentA 8.5x11 inch map of "Major Eelgrass Beds in the Great Bay Estuary" (Nelson et al., 1981) was scanned and georeferenced to the NHD 1:24,000 shoreline layer by The Nature Conservancy for the Great Bay Estuary Restoration Compendium. Because of substantial differences in shorelines between the two sources, this process was accomplished in six steps, working in one area of the estuary at a time and tracing the shapes onscreen to create a new shapefile. Rectifying smaller sections provided relatively good fits, as compared to trying to adjust the entire hand drawn map to the modern shoreline. The combined coverage was developed using the ArcInfo union tool.NH Department of Environmental Services obtained additional information from one of the report authors (Don Miller at NHF&G) in 2009. Mr. Miller reported that the original mapping was done on NOAA charts. Crews moved around by boat and assessed beds with divers using quadrats or what they could see. The survey did not include the tidal rivers. The survey was conducted to assess natural resources damages for the 1979 New Concord oil spill (25,000 gallons) which impacted the whole estuary. Citation: Nelson, J.I., D. Collins, G. Lamb, D. Miller, S. Perry. 1981. Inventory of Natural Resources of Great Bay Estuarine System. Volume I. New Hampshire Fish and Game Department and Office of State Planning, Concord, NH. December 1981. Citation for the Great Bay Restoration Compendium:Odell, J., Eberhardt, A., Burdick, D., and P. Ingraham. 2006. Great Bay Estuary Restoration Compendium. Report to the Piscataqua Region Estuaries Partnership and the New Hampshire Coastal Program, Durham and Portsmouth, NH. Published online: Published online: http://prep.unh.edu/resources/pdf/great_bay_restoration-tnc-06.pdf.

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