||Sources, Transport, and Storage of Sediment at Selected Sites in the Chesapeake Bay Watershed.
A. C. Gellis;
C. R. Hupp;
M. J. Pavich;
J. M. Landwehr;
W. S. L. Banks
||Geological Survey, Reston, VA.; Environmental Protection Agency, Annapolis, MD. Chesapeake Bay Program.; U.S. Deparment of Agriculture, Agricultural Research Service.
Chesapeake Bay Watershed;
Susquehanna River Watershed;
Pocomoke River Watershed;
Mattawoman Creek Watershed;
Little Conestoga Creek Watershed;
Chesapeake Bay Flood Plains
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||The Chesapeake Bay Watershed covers 165,800 square kilometers and is supplied with water and sediment from five major physiographic provinces: Appalachian Plateau, Blue Ridge, Coastal Plain, Piedmont, and the Valley and Ridge. Suspended-sediment loads measured in the Chesapeake Bay Watershed showed that the Piedmont Physiographic Province has the highest rates of modern (20th Century) sediment yields, measured at U.S. Geological Survey streamflow-gaging stations, and the lowest rates of background or geologic rates of erosion (approx. 10,000 years) measured with in situ beryllium- 10. In the agricultural and urbanizing Little Conestoga Creek Watershed, a Piedmont watershed, sources of sediment using the sediment-fingerprinting approach showed that streambanks were the most important source (63 percent), followed by cropland (37 percent). Cesium-137 inventories, which quantify erosion rates over a 40-year period, showed average cropland erosion of 19.39 megagrams per hectare per year in the Little Conestoga Creek Watershed. If this erosion rate is extrapolated to the 13 percent of the watershed that is in cropland, then cropland could contribute almost four times the measured suspended-sediment load transported out of the watershed (27,600 megagrams per hectare per year), indicating that much of the eroded sediment is being deposited in channel and upland storage.
||Prepared in cooperation with Environmental Protection Agency, Annapolis, MD. Chesapeake Bay Program. and U.S. Deparment of Agriculture, Agricultural Research Service.
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||68D; 68C; 47D; 57H; 57Y
||Scientific Investigations rept