ASSESSING THE IN-STREAM TRANSPORT AND RETENTION DYNAMICS OF SEDIMENT, NUTRIENTS, AND DOC IN S.E. PIEDMONT URBANIZING WATERSHEDS

The residual mass balance approach initially proposed by Bowes and House (2001) was utilized to quantify the in-stream transport and retention dynamics of total suspended solids (TSS), total dissolved phosphorus (TDP), total phosphorus (TP), NO₃-N, NH₄-N, dissolved organic N (DON), particulate N, total nitrogen (TN), and dissolved organic carbon (DOC) during dormant and growing seasons for four stream reaches in a developing Piedmont watershed. The study stream segments represent four different development/restoration states: 1. Undeveloped no stream restoration; 2. Undeveloped with stream restoration; 3. Developed with stream restoration and significant engineered stormwater control measures (SCMS); and 4: developed with SCMs and no stream restoration. In addition to seasonal variations we examined the nutrient and sediment transport patterns under different flow regimes including baseflow, in-bank stormflow and out-of-bank stormflow.