National Dam Inspection Program. Lake Wynonah Dam (PA00702), Schuylkill River Basin, Plum Creek, Schuylkill County, Pennsylvania. Phase 1 Inspection Report.
Abstract
Lake Wynonah Dam is a 92 foot high, zoned embankment. The dam measures 950 feet along the crest impounding a 175 acre reservoir. The dam was designed to use locally available borrow materials and contains two primary material zones. The upstream zone, consisting of approximately 2/3 of the dam cross-section, is composed of impervious materials classified as clayey sands and silty clayey sands. The downstream section, which consists of approximately 1/3 of the cross-section, is composed of a previous coarse-fill zone. There is a 2-foot thick blanket drain beneath the coarse-fill zone. The toe drain discharges into the natural stream channel. A 24-foot wide cut-off trench was excavated into sound rock along the centerline to control seepage. A double line split-spaced grout curtain was constructed below the core trench. A maximum hole spacing was 5 feet on center and holes were staggered 5 feet up- and downstream of the centerline. The upstream slope contains benches at elevations 634 and 588. The slope is riprapped from the upper bench to elevation 646 (3 feet below the crest of the dam).
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1978
- Accession Number
- ADA068640