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Monday, October 17 • 11:30am - 12:00pm
Technical Session. NHD Stewardship in Maine: Focus on the Coast and Estuaries

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AUTHORS: Becky Schaffner, Maine Department of Environmental Protection; Vicki Schmidt, Maine Department of Environmental Protection; Anji Auger, MEGIS

ABSTRACT: The NHD Stewardship process in Maine is active and ongoing. The standard editing process prioritizes coastal and urbanized areas where many anthropogenic changes to hydrology have occurred. These changes include development-related modifications such as channelization and diversion of waterways, construction of retention basins and reservoirs, and dam construction and removal. Additional feature edits are driven by the need to correct errors (e.g. missing and mislocated streams) observed during field data collection and monitoring efforts. Layers and methods used to update and correct NHD features include high resolution LiDAR elevation data, high resolution imagery (NAIP, Google Earth), Esri ArcGIS Hydrology Tools, and the TauDEM (Terrain Analysis Using Digital Elevation Models) hydrology tools. In addition to the standard editing process, a special project was undertaken to add and update statewide estuary features. Refining estuarine waters in the NHD was particularly important because state regulations such as Shoreland Zoning are based on the location and status of such waters. More accurate delineations increase the likelihood that such rules fulfill their purpose, without imposing undue burdens on property owners. The location and extent of estuary features was determined based on the best available state-wide salinity, head-of-tide, and habitat datasets.

Monday October 17, 2016 11:30am - 12:00pm EDT
Nauset V

Attendees (6)