Hochwasserrückhaltebecken Eicherscheid, Flood control reservoir in Bad Münstereifel, Germany.

The Eicherscheid detention basin is a dam structure along the upper Erft River designed to hold back water during heavy rainfall. The facility sits within a forested setting and connects to walking and cycling paths that wind through the surrounding landscape.

The basin was planned by the Erftverband to protect Bad Münstereifel and Euskirchen from flooding on the upper Erft. It holds back around 900,000 m³, enough for a flood expected once in 100 years, and releases at most 7 m³/s, cutting a peak inflow of up to 42 m³/s by about 35 m³/s. A hillside overflow structure serves as the flood relief.

The small reservoir behind the dam is popular with anglers and people seeking rest; in summer many water birds can be observed, and picnics are possible on the bank. The basin is operated by the Erftverband, the water association that planned the dam.

The basin is easily accessible by public transit and cycling routes, especially via the popular Erft bike path from Bad Münstereifel. The best time to visit is outside rainy seasons when the paths are dry and easy to walk.

During a catastrophic flood in 2021, the basin experienced an extreme water surge that far exceeded its design capacity. The event demonstrated both the critical role of such infrastructure and the potential impact of rare extreme weather on engineered flood protection.