Skytjefossen has a drop of 300 m. It's regulated for the hydroelectric energy production, but may periodically have good water flow and is then a wonderful sight.
Exit the road 7 in Eidfjord. Follow the signs to the Sima power plant, continue past the power plant as far as the roads are paved to the parking at Tveit. Follow the dirt road further up the valley by foot (approximately 20 minutes each way). You can see the waterfall on your right.