National Dam Inspection Program. Jameson Dam (NDI I.D. MD-38) Potomac River Basin. Gilbert Run Charles County. Maryland. Phase I Inspection Report

摘要

Based on the evaluation of available design information and visual observations of conditions as they existed on the dates of the field reconnaissances, the general condition of Jameson Dam is considered to fair. Transported silt-sand soil was observed deposited in the area of the seepage blanket drain outlets. Due to the pipeable nature of the embankment soils, seepage discharge should be periodically observed to determine if embankment soils are being transported. The seepage flows are not considered to represent a significant hazard relative to the overall stability of the dam at the present time. Based on review of design documents and visual observations, there is concern the emergency spillway channel will undergo severe erosion when activated by large flood flows. A study to evaluate the erosion potential of the spillway channel should be implemented by the owner. The reservoir drain slide gate was found inoperable and is judged inadequate in its present condition. Appropriate maintenance and/or repairs should be performed as soon as possible. Jameson Dam is classified as an intermediate size, high hazard dam according to guideline criteria. Based on Soil Conservation Service hydrological/hydraulic design computations, spillway capacity was found adequate to pass 100 percent of the PMF. Therefore, spillway capacity is in accordance with recommended guideline criteria.