Sediment removal is expensive; at Lake Barcroft, over $300,000 was spent in just 10 years. Drag-line at work. Photo courtesy U.S. Soil Conservation Service. Fairfax County, Virginia.n.d. Figure 3 in U.S. Geological Survey. Circular 601-G. 1971.
Digital File:rda00004

ID. Rickert, D.A. 4