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Rainfall, streamflow, sediment, and turbidity data are being collected as part of a study to evaluate the effects of highway construction on sedinent discharge. The study is also designed to determine the effectiveness of different erosion-control measures in reducing sediment discharges. The study area, near Enola, Pa., consists of five adjacent drainage basins, four of which will be crossed by Interstate 81. Ninety percent of the land in each of the basins is in forest or grass. Active farmland accounts for less than 10 percent, and the remainder is in roadways and buildings. The major factor affecting sediment concentrations and discharges was the construction of a one-lane roadway and a 5-acre (2 hm2 ) farm pond in basin 2. Approximately 100 tons (90 t) of sediment was discharged by the stream as a result of the roadway and pond construction. INTRODUCTION The Pennsylvania Departments of Transportation and Environmental Resources (State Conservation Commission) and the U.S. Geological Survey are cooperating in a field 'study to determine the effects of highway construction on discharges and sediment concentrations of streams. The study is also designed to determine the effectiveness of different types of erosion-control measures in reducing sediment during and after construction. The contents of this report reflect the views of the author who is responsible for the facts and the accuracy of the data presented herein. The contents do not necessarily reflect the offickl views or policies of the Pennsylvania Department of Transportation or the Federal Highway Administration. This report does not constitute a standard, specification, or regulation. The study area is in Cumberland County, west of Enola, Pa., and is composed of five adjacent drainage basins (fig. 1). Four of Ml P E N N S Y LV A N IA 2A E X P L A N A T IO N B as in b ou nd ar y

Sediment characteristics of five streams near Harrisburg, Pennsylvania, before highway construction