National Dam Safety Program. Brush Valley Dam. NDI-PA-00652. PA DER-19-3. Susquehanna River Basin. South Branch Roaring Creek, Columbia County, Pennsylvania. Phase I Inspection Report.

摘要

Brush Valley Dam is an earth embankment with a maximum height of about 21 feet and an approximate length of 920 feet. The top of the dam (Elev. 1128.0) is 16 feet wide. The upstream slope is 2.5 horizontal to 1 vertical(2.5H:1V), and is protected with riprap. The downstream slope is 2 horizontal to 1 vertical (2H:1V) and is surfaced with grass. An ungated overflow spillway is located about 200 feet from the right abutment. The crest of the spillway (Elev.1123.0) is about 52 feet long. The control section is concrete, while the downstream slope is surfaced with riprap set in motar. A timber decked steel beam bridge supported by 3 intermediate piers, provides access across the spillway. A 16-inch diameter cast iron pipe is located at the base of spillway section. The upstream end of the pipe is joined to a submerged intake structure. This structure is fitted with screens to prevent debris from entering the pipe. Pipe discharge is controlled by a valve located at the downstream end of the pipe in the center of the spillway channel. The valve is operated manually and diverts flow either to a pumphouse or to the downstream channel. Based on a review of the available drawings, no upstream control valve is positioned on the pipe. The pumphouse is located at the toe of the embankment about 400 feet from the left abutment. Water is pumped from Brush Valley reservoir to a distributing reservoir about 8,000 feet to southeast. The distributing reservoir is about 600 feet above the level of Brush Valley reservoir. (Author)