Description: The enhanced flow path dataset (water network) created from using the Chesapeake Conservancy's flow path analysis methodology (https://chesapeakeconservancy.org/wp-content/uploads/2018/07/CIC_Enhanced_Flowpath_Methods_20180703.pdf), combining terrain/elevation data and the Chesapeake Conservancy’s high resolution land cover.The Lidar-derived digital elevation model (Statewide DCNR PAMAP 2006-2008 - Quality Level 3 LiDAR - 1 meter DEM) was hydro-conditioned (breached and filled) using the open-source software SAGA and ArcGIS Hydrology toolbox. Flow direction and Flow accumulation rasters were calculated to delineate flow paths. An accumulation threshold of 60 acres of upslope land was applied to identify a given pixel as a channel head; anything downstream of that channel head is identified as a flow path. The flow paths were then widened based on the total upslope area and the USGS regional curve equation for the Coastal Plain region of MD and VA. Large rivers and other open water features classified as “water” in the high resolution land cover dataset were added to the widened flow paths dataset. This final integration is the “enhanced flow path dataset.” Downloadable from: https://chesapeakeconservancy.org/conservation-innovation-center/high-resolution-data/enhanced-flow-paths/pa-data-downloader/
Service Item Id: 3d10df621bcc4b40b0f2c01b65745a68
Copyright Text: Chesapeake Conservancy, Conservation Innovation Center, Chesapeake Bay Program, University of Vermont Spatial Analysis Laboratory
Description: An intermediate raster in the enhanced flow path workflow (https://chesapeakeconservancy.org/wp-content/uploads/2018/07/CIC_Enhanced_Flowpath_Methods_20180703.pdf), flow accumulation represents the cumulative sum of all cells flowing into each downslope cell in the output raster. The flow accumulation layer allows the user to set custom contributing area thresholds; thus, it can provide greater detail or a denser flow network (capturing ephemeral streams or flow paths) than the enhanced flow path dataset, which uses a contributing area threshold of 60 acres.
Downloadable from: https://chesapeakeconservancy.org/conservation-innovation-center/high-resolution-data/enhanced-flow-paths/pa-data-downloader/
Service Item Id: 3d10df621bcc4b40b0f2c01b65745a68
Copyright Text: Chesapeake Conservancy; Conservation Innovation Center
Description: TWI- 2018 Susquehanna River Basin Commission SRBC. Raster Datasets displaying Topographic Wetness Index (TWI) for Lancaster County. Based on 2015 Lidar data and Tau_DEM extension tools for ArcMap. Downloadable from: http://www.pasda.psu.edu/uci/DataSummary.aspx?dataset=363
Service Item Id: 3d10df621bcc4b40b0f2c01b65745a68
Copyright Text: Susquehanna River Basin Commission
Description: Chesapeake Conservancy’s high resolution land cover(http://chesapeakeconservancy.org/conservation-innovation-center/high-resolution-data/land-cover-data-project/) categories: Emergent Wetlands, Low Vegetation, and Barren. Clipped to the 35’ buffer zone of the enhanced flow paths: https://chesapeakeconservancy.org/wp-content/uploads/2018/07/CIC_Enhanced_Flowpath_Methods_20180703.pdf
All downloadable from: https://chesapeakeconservancy.org/conservation-innovation-center/high-resolution-data/enhanced-flow-paths/pa-data-downloader/
Service Item Id: 3d10df621bcc4b40b0f2c01b65745a68
Copyright Text: Chesapeake Conservancy; Conservation Innovation Center