Generation is normally scheduled during weekdays to take advantage of relatively higher power values. The figure to the right illustrates the new rule band for operating the project to maintain the desired lake levels to achieve these objectives. Penelec conducted a feasibility study of alternative ways to meet Maryland DO standards and identified a tailrace weir and an oxygen injection system as the most promising alternatives. The tailrace weir was determined to be the most practical and cost-effective solution to correct the DO problem. The tailrace weir, basically a small waterfall which aerates the water after discharge from the power plant, was constructed and ready for operation in December 1994.
Results show that it is very effective at improving DO in the tailrace at startup.
Uptake rates of DO ranged from 0.5 to 4.5 ppm, depending on the discharge DO level. Many variables have affected trout populations numbers in the Youghiogheny River since 1987 when MDNR began sampling. However, standing crop estimates indicate an improving population at Hoyes Run. Measurements at Sang Run are more uncertain due to greater difficulty in sampling in that portion of the river. The temperature enhancement protocol was formally implemented in the summer of 1995.