National Dam Inspection Program. Hadley Dam (PA-489, NDI Number PA-00245, PennDER Number 43-52, SCS Number PA-489), Ohio River Basin, Morrison Run, Mercer County, Pennsylvania. Phase I Inspection Report.

摘要

Hadley Dam, a floodwater retarding dam designed by the U.S. Department of Agriculture, Soil Conservation Service (SCS), is also known by its SCS number PA 489. The zoned earthfill embankment has a crest length of 750 feet, a maximum height of 51 feet, and a top width of 18 feet. The upstream side slope is 3H:1V (Horizontal to Vertical) with a 10-foot wide berm at E1. 1108.0 feet. The downstream side slope is 2H:1V with a 10-foot wide berm at E1. 1117.0 feet. A foundation drain is provided under the downstream portion of the embankment. A 4-foot wide trench was excavated in the foundation to depths varying from 3 to 10 feet. A 12-inch diameter perforated drainpipe is provided in the foundation drain with its outlet discharging into the impact basin. The principal spillway is located approximately 630 feet from the left abutment. The main features of the spillway are a pond drain, a reinforced concrete riser and a pipe conduit through the fill with an impact basin at the discharge end.