SCASM 20151119_final linked in
- 1. SCASM 11/19 2015 Collaborative Water Quality Monitoring in Beaufort County
- 2. Characteristics Coastal County 50% Open and Salt Marshes Limited Freshwater Input High Tidal Amplitude Major Shellfish Harvesting Rapid Population Growth
- 3. No mountain drainage into ocean ACE BASIN PRSound
- 4. HIGH TIDE = +9.5 ft. LOW TIDE = - 0.5 ft. High Tidal Amplitude
- 5. Impacts on Estuarine Animals • Marine zooplankton (rotifers and copepods) – change from ~30 to 15 ppt. • Oysters spat - minimum 6 ppt for larvae to settle and metamorphose into spat. • Blue crab larvae - minimum 20 ppt salt. • Spotted sea trout spawn - levels above 20 ppt. • Brown shrimp post larvae (<day 13) - < 25 ppt causing mortality.
- 7. 2006
- 8. Impacts of Development on Runoff New Development adds Impervious Surface Impervious Surface causes An increase in rate of runoff Pollutants are carried to receiving waters An increase in total volume of runoff
- 9. History of Stormwater Controls • 1994 – Flooding leads to Peak Controls • 1995 – Closing of 500 ac. of shellfish harvesting beds leads to Clean Water Task Force • 1998 – Adoption of First Water Quality requirements – First BMP Manual • 1998-2009 – No closure of Shellfish Harvesting Areas- SW Plan - 2006 • 2009 – May River closure leads to Runoff Volume Controls
- 13. ~ 6 inch rain event
- 14. Okatie River Salinity Impacts • Insert DNR slide here. Map too.
- 15. Okatie River Salinity Impacts 0 5 10 15 20 25 30 35 1-Apr 6-Apr 11-Apr 16-Apr 21-Apr 26-Apr Salinity 0.0 0.1 0.2 0.3 0 2 4 6 8 10 1-Apr 3-Apr 5-Apr 7-Apr 9-Apr 11-Apr 13-Apr 15-Apr 17-Apr 19-Apr 21-Apr 23-Apr 25-Apr 27-Apr 29-Apr 1-May 3-May 5-May 7-May Rainfall(in) Rainfall(mm) 0 10 20 30 Salinity 0 10 20 30 0 10 20 30 1-Apr 11-Apr 21-Apr 1-May Salinityandrainfall OK1 OK6 OK1 OK4 OK5 OK6 OK3 OK2
- 17. Hwy 278 ponds