Delaware River Basin Alder Marsh Brook Wayne County Pennsylvania Alder Marsh Dam Ndi Id Nopa 00153 Der Id No64 150 Pennsylvania Game Commission Phase 1 Inspection Report National Dam Inspection Program
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| Author | : GANNETT FLEMING CORDDRY AND CARPENTER INC HARRISBURG PA. |
| Publisher | : |
| Total Pages | : 75 |
| Release | : 1981 |
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| ISBN | : |
Alder Marsh Dam is a zoned-earthfill structure approximately 250 feet long (including both spillways) and 10 feet high. The impervious core of the dam has a base width equal to one-third of the total base width of the embankment and extends to the top of the embankment where it has a width of four feet. The principal spillway consists of a rectangular channel, with concrete side walls and a grouted stone floor, constructed through the left end of the dam. A double row of stoplogs near the center of the channel are used to control the reservoir pool elevation. Based on available records, visual inspection, calculations, and past operational performance, Alder Marsh Dam is judged to be in good condition. Considering the size and hazard classification of the dam, the recommended Spillway Design Flood (SDF) varies between the 100-year flood and the 1/2 Probable Maximum Flood (PMF). The 1/2 PMF was, in this case, selected as the SDF. The existing spillway will pass approximately 44 percent of the PMF before overtopping of the dam occurs and is, accordingly, rated as inadequate. If the emergency spillway channel were widened to its design width and the crest lowered to its design elevation, the spillway would pass about 70 percent of the PMF. The spillway would then be rated as adequate.
| Author | : O'BRIEN AND GERE ENGINEERS INC PHILADELPHIA PA JUSTIN AND COURTNEY DIV. |
| Publisher | : |
| Total Pages | : 89 |
| Release | : 1979 |
| Genre | : |
| ISBN | : |
Shohola Marsh Dam is a concrete gravity structure which impounds a 1137 acre lake at normal pool elevation. Construction of the dam was completed in July, 1968. Shohola Marsh Reservoir is owned by the Pennsylvania Game Commission and is used as a wildlife habitat. Based on visual observations made during the field inspection, the dam appears to be in good condition. The dam is classified as a 'high' hazard structure which indicates there is potential for extensive property damage and possible loss of life in the event of a dam failure. Examination of the results of the hydrologic and hydraulic analyses indicates that the existing spillway system is able to pass approximately 63 percent of the Probable Maximum Flood (PMF) without being overtopped. It appears the spillways are designed for heads less than those associated with the PMF. Negative pressures on the downstream face of the spillway would develop for discharges exceeding approximately 30 percent of the PMF. For discharges in excess of 50 percent of the PMF, cavitation may occur. Stability analyses of the spillway system and the non-overflow portion of the dam reveal that the resultant of forces falls outside the middle third of the base for loadings associated with 1.) Normal and 5 kips per square foot (ksf) ice load, 2.) 1/2 PMF, 3.) Water to the top of dam, 4.) PMF. Further detailed stability, hydrologic and hydraulic studies should be performed to determine if remedial measures are necessary at this time. (Author).
| Author | : GANNETT FLEMING CORDDRY AND CARPENTER INC HARRISBURG PA. |
| Publisher | : |
| Total Pages | : 71 |
| Release | : 1981 |
| Genre | : |
| ISBN | : |
Based on available records, visual inspection, calculations, and past operational performance, Lake Paupackan Dam is judged to be in fair condition. Considering the size and hazard classification of the dam, the recommended Spillway Design Flood (SDF) varies between the 1/2 Probable Maximum Flood (PMF) and the PMF. The 1/2 PMF was, in this case, selected as the SDF. The spillway and reservoir, under existing conditions, will pass approximately 19 percent of the PMF before overtopping of the dam occurs. The spillway is, therefore, rated as inadequate.
| Author | : |
| Publisher | : |
| Total Pages | : 76 |
| Release | : 1981 |
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| ISBN | : |
Based on the criteria established for these studies, Elk Lake Dam is judged to be in fair condition. The recommended Spillway Design Flood (SDF) for the size and hazard classification of the dam is the Probable Maximum Flood (PMF). The existing spillway will pass about 84 percent of the PMF before overtopping of the dam occurs. The spillway capacity is rated as inadequate. Several deficiencies were observed at the dam. The most serious is the probable lack of an adequate impervious barrier through the dam. Although some maintenance has been performed, the existing maintenance program could be upgraded. The following remedial measures, listed in approximate order of priority, are recommended to be undertaken by the Owner without delay: (1) Clear brush and debris on and adjacent to the dam. (2) Engage the services of a professional engineer experienced in the design and construction of dams. Utilize his advice in removing the trees on and near the embankment. If any seepage becomes evident after the brush, trees, and debris are removed, the condition should be assessed by the engineer. (3) Fill the slots by the spillway bridge with concrete or other suitable impervious material. (4) Fill the burrowing animal hole adjacent to the spillway with suitable impervious material.
| Author | : National Dam Inspection Program |
| Publisher | : |
| Total Pages | : 120 |
| Release | : 1980 |
| Genre | : Dams |
| ISBN | : |
| Author | : Bernard M. Mihalcin |
| Publisher | : |
| Total Pages | : 95 |
| Release | : 1981 |
| Genre | : |
| ISBN | : |
Wild Acres Lake Dam is located on a branch of Hornbecks Creek in Delaware Township, Pike County, Pennsylvania. The facility is an integral part of the surrounding development known as Wild Acres. The community is nestled in the mountains of Pike County less than five miles west of U.S. Route 209 which parallels the Delaware River in this area. Observations made during the visual inspection indicate the embankment and adjacent dike are in good condition. Heavy brush growth and small trees were observed along the embankment crest and upstream face. No evidence of seepage through the downstream embankment face, excess settlement, sloughing, erosion or animal burrows was encountered by the inspection team. Some rock slope protection has been displaced immediately adjacent the spillway right wingwall, leaving small bare areas on both the upstream and downstream embankment faces. The top of the concrete corewall exhibits excessive cracking and spalling along its entire length except for that portion associated with the dike along the right abutment which is in relatively good condition.
| Author | : John Boschuk (Jr) |
| Publisher | : |
| Total Pages | : 93 |
| Release | : 1978 |
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| ISBN | : |
Lower Woods Pond Dam is a series of three dams owned by the Pennsylvania Fish Commission which were rebuilt in 1956 by the Fish Commission. The facility is considered to be in good condition and well maintained. Collectively, the dams are clasified as a 'High' hazard potential structure consistent with its potential to cause extensive property damage and possible loss of life in the event of failure. The dams are also clasified as an 'Intermediate' size structure based on its 1,470 acre-feet storage capacity. The design data and supplemental information pertinent to this structure were sufficient to evaluate it and the appurtenant structures in accordance with Phase I Guidelines. The hydrologic and hydraulic calculations indicate that the structure will pass 60 percent of the Probable Maximum Flood. Since the dams will be overtopped by one foot during the Probable Maximum Flood, the spillway systems are considered to be 'Inadequate' but not 'Seriously Inadequate'.
| Author | : CORPS OF ENGINEERS BALTIMORE MD BALTIMORE DISTRICT. |
| Publisher | : |
| Total Pages | : 76 |
| Release | : 1981 |
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| ISBN | : |
Contents: Brief Assessment of General Condition and Recommended Action; Project Information; Engineering Data; Visual Inspection; Operational Procedures; Hydrology and Hydraulics; Structural Stability; Assessment, Recommendations, and Proposed Remedial Measures; Appendices.
| Author | : |
| Publisher | : |
| Total Pages | : 59 |
| Release | : 1981 |
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| ISBN | : |
Perch Pond Dam is a composite earthfill-masonry structure, consisting of an earthfill embankment located between two dry stone masonry walls. The upstream wall is covered with concrete on the lake side of the wall. The dam is 165 feet long and 13.5 feet high. The crest is 16 feet wide, including the masonry walls. The spillway is a 12.7 foot long broad crested weir with a center pier that is 2.1 feet wide. The outlet works for the dam is an 8-in. cast iron pipe through the dam. Details of the inlet and the operational status of the outlet works could not be determined. Perch Pond Dam is judged to be in good structural condition, based on the visual inspection. Since the spillway cannot pass the 100-year flood without overtopping the dam, the spillway is rated as inadequate.
| Author | : Bernard M. Mihalcin |
| Publisher | : |
| Total Pages | : 77 |
| Release | : 1981 |
| Genre | : |
| ISBN | : |
Based on a visual inspection, operational history, and available engineering data, the dam is considered to be in fair condition. The size classification of the facility is small and the hazard classification is considered to be high. In accordance with the recommended guidelines, the Spillway Design Flood (SDF) ranges between the 1/2 PMF (Probable Maximum Flood) and the PMF. Due to the high potential for damage to downstream structures and possible loss of life, the SDF is considered to be the PMF. Results of the hydrologic and hydraulic analysis indicate the facility will pass and/or store approximately 50 percent of the PMF prior to embankment overtopping at the low area in the embankment crest. Consequently, the spillway is assessed as being inadequate, but not seriously inadequate. Recommended owner procedures are listed.
