Technical data of the Ennepetalsperre

Water management
Total storage capacity	12.6 million^m3
Osenberg forebay	100.000^m3
Side basins: Bosselbach, Altenbreckerfeld, Ebbinghausen, Holthausen, Altena and Altenfeld	total: 27,550^m3
Reservoir level above sea level	307,47 m
Catchment area	48.47 ^km2
Reservoir surface area at reservoir level	1.03 ^km2

Barrier structure
Height of top of wall	316.15 m above sea level
Greatest height above valley floor	51 m
Crown length	320 m
Crown width	4,50 m
Wall volume	110.000^m3

Base drains
Diameter	1,00 - 1,20 m
Length	approx. 52 m
Flow rate bottom outlet max.	2 x 7^m3/s

Flood discharge
Overflow crest consisting of 13 fields of 5.4 m each with an overflow length of	70,2 m

Utilisation
Annual raw water discharge	approx. 9 million^m3

Power station
Absorption capacity	110 - 1400 l/s
Output	max. 320 kW
Average total annual energy production	1.4 million kWh