Nonpoint Source Pollution from Agricultural Watersheds on Coastal Plain Soils

摘要

A study was conducted on two rural agricultural watersheds in southern Delaware to obtain information on nitrogen (N) and phosphorus (P) loading rates, and to develop data for future water quality modeling efforts. The amount of rainfall N and P was found to be greater than the nonpoint source N and P loading rates. Over 50% of the N, P, and chemical oxygen demand (COD) loads occurred in baseflow. A larger relative percentage of total P, COD, and organic N was transported during storm runoff than nitrate-N. However, there was no observed relationship between N and P concentrations and flowrate for either watershed.