Those with special requirements that appear to exceed these capabilities should consult with USRD personnel for further information regarding their special materials handling and test requirements. The table below provides a description of the usual capabilities of the Leesburg Facility. Measured sound speed in the spring is 1488 meters per second at a depth of 15 meters. Water temperature in Bugg Spring (below about 5 meters) is a constant 22 degrees Celsius year round. The inflow and discharge of the spring remain quite constant with time so that the level of the surface of the spring varies only about 0.5 meters. It is estimated that the water in the spring "turns over" about once a week. Though this is a considerable amount of water, the volume of the spring is of such magnitude that there are no significant currents in the spring to interfere with the acoustic measurements. Hydrographic chart of Bugg Spring showing 3-D view of shape and depth to 50 meters, and position of the testing platform.ĭischarge from the spring averages about 0.4 cubic meters per second or about 35,000 cubic meters per day. The depth to the hard bottom in the vicinity of the test wells varies from approximately 53 meters at the walkway end of the test well to approximately 53.5 meters at the far end. The bottom is covered with 3.5 meters of silty sludge-like deposit. The hard bottom is relatively flat, sloping approximately 0.5 meters from one end of the test well to the other. The neck of the funnel is a right elliptical cylinder 30 meters high with major and minor axes of 60 meters and 30 meters, respectively. The spring itself is funnel shaped with a top diameter of approximately 130 meters and sloping walls at roughly 45 degrees to the neck of the funnel.
It is the only facility of its kind with year round warm weather.
There is minimum aquatic life interference. Low reverberation allows measurements down to 5 Hz. Dense vegetation surrounding the spring and its somewhat isolated location in a rural area contribute to the low noise levels in the spring. Bugg Spring has an ambient noise level below sea state zero and has no recreational boating noise. This is a prime facility for calibration of submarine and surface ship tactical towed arrays, and is among the quietest Navy open water facilities. The Underwater Sound Reference Division (USRD) of the Naval Undersea Warfare Center (NUWC) Division Newport maintains an open water facility at Bugg Spring in Okahumpka, Florida (approximately 8 kilometers southwest of Leesburg).
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