National Dam Inspection Program. Guilford Reservoir (NDI-ID-Number-MD-106) Patapsco River Basin, Stony Run, Baltimore City, Maryland. Phase I Inspection Report

摘要

Based on the visual inspection, available records, past operational performance, and in accordance with the guideline criteria established for these studies, Guilford Reservoir is judged to be in good condition. Guilford Reservoir, a square-shaped impoundment is totally enclosed by an embankment which rises above the existing topography around its perimeter. Finished water from the Ashburton Water Purification Plant is normally fed through the Baltimore City water transmission system by gravity to the Guilford Reservoir. On occasion, flow to the reservoir is supplemented by pumpage from the Vernon Pumping Station. Water levels in the reservoir are generally maintained between elevations 338 and 340.4. When the water level reaches elevation 340.4, electrically operated butterfly valves are closed to stop inflow into the reservoir. When the water demand has caused the reservoir level to drop 1 to 2 feet, the valves are opened to allow the reservoir to refill. Because all inflow into the reservoir is controlled with the exception of rainfall directly on the water surface, flood routing and detailed hydraulic and hydrologic analyses are not required. No embankment stability problems were evident at the time of the inspection, however surface erosion and a possible seepage area were noted along the southern and southwest portions of the embankment.