Contributions and Internet links are arranged in chronological order. For the most part, documents are in a searchable Portable Document Format (PDF) format, although some PDF files contain documents as images and are not searchable. Use the search box on the right to find a particular topic, title, or author. PIA Guide to Contributors.
2007 Alternate state theory and tidal freshwater mudflat experimental ecology on Anacostia River, Washington, D. C. [PDF, 38 MB] Note this is a large document.
The concept of multiple community states was tested in mudflats of the low/middle marsh intertidal zone of two restored freshwater tidal marshes on the Anacostia River. Results support the hypothesized alternate existence of the two system states in the same space and relative time, each dependent upon a critical mass of large grazers.
O. H. Devereux. University of Maryland College Park, Masters Thesis. 104 pp.
Streambanks contributed the highest relative quantity of sediment in the fall and spring while upland areas contributed mostly during winter. Street residue contributed 12% on average and was the source most concentrated in anthropogenically enriched elements.
Daily Low Flow Monitoring
September 2014 Water Supply Outlook
Is it safe to swim?