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<p><span>In 2017 the first aquatic habitat survey assessment of this project was performed by the United States Environmental Protection Agency Region 3 (Mid-Atlantic). This survey utilized a single beam echo sounder (Bio Sonics MX Habitat Echo sounder), along with the accompanying post-processing software (Visual Habitat), to assess submerged aquatic vegetation (SAV) distribution and extent along the tidal Delaware River. This first survey was used to check for presence/absence of vegetation in the system. Sampling in this portion of the Delaware River occurred in July, August, and September. </span></p>
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<div><span>The distributions for SAV heights at different depths suggests that the portion of the water column </span><span>between 1 and 4 meters in depth appears to be the optimal growth area for SAV in tidal Delaware </span><span>River, with the most plant growth between 2 – 3 meters in depth (elevation). Due to the limited area of SAV growth surveys took place in the 2-3 hours before and after high tide in order to operate the research vessel safely close to the shore. Due to this being the first survey of this kind attempted in this river, data collection was focused on gathering base information on areas where SAV was present in the system. </span>
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<div><span style='font-size:medium;'>This layer represents each "ping" or point recorded by the echo sounder, which shows the lines of navigation the research vessel took during the survey. These pings are also colored based on the percent coverage of SAV in that location ranging between 0 - 100%. During this survey the vessel was operated primarily parallel to the shoreline, rather then the figure eight pattern used in future surveys. </span></div><div><span style='font-size:medium;'><br /></span></div><div><a href='https://epa.maps.arcgis.com/home/item.html?id=332240f6bef649dc9b0ac7d71d804044' target='_blank' rel='nofollow ugc noopener noreferrer'><b><font color='#0000ff'>Download Points (CSV)</font></b></a></div>
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SAVDelaware River2017
2017 Delaware River SAV Aquatic Habitat Survey Assessment (Presence/Absence)
U.S EPA Region 3
<p>None.</p>
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