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费尔瑟坝是一座坝高５２ｍ的土石坝，两个泄水底孔（直径＝８００ｍｍ）可作为装机容量４００ｋＷ水电站的压力管道。１９９６年和１９９７年将对这两个泄水底孔进行改建。该建筑物原设计未设置紧急闸门。因此，必须拆除截流闸门，在水深３９ｍ处安装检修闸门新支撑，在压力管道廊道内安装新的蝶形阀。一个专门研制的、带有减压箱和一条９ｍ深进水管的潜水平台为潜水员提供了安全而有效的工作条件。预计费用为３５０万马克，改建工程在降低库水位的情况下，不会影响供水和发电
Ferris Dam is an earth dam of 52 m in height with two drainage holes ( = 800 mm in diameter) serving as pressure pipes for 400kW hydropower stations. These two drainage holes will be remodeled in 1996 and 1997. The building was originally designed without emergency gates. Therefore, the closure gate must be dismantled, a new support for the inspection gate installed at a depth of 39 m and a new butterfly valve installed in the pressure piping gallery. A specially developed submersible platform with a vacuum box and a 9m deep water inlet provides divers with safe and efficient working conditions. Estimated cost 3.5 million marks, renovation project in the case of reducing the reservoir water level, will not affect the water supply and power generation