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Flood control reservoir between St. Georgen and Schallstadt / Germany

Outlet structure

DESCPRIPTION OF PROJECT

The flood control reservoir was constructed at the beginning of the 1980s between Freiburg St. Georgen and Schallstadt.

The flood defence structure is a u-shaped dam with a height of 4.5 m. The outlet structure includes the operating discharge and flood evacuation structures. An additional emergency discharge via a depression in the dam is possible. A safety report and a detailed safety assessment for the flood control reservoir were prepared in accordance with the currently effective regulations.

This assessment disclosed deficits, which were analysed in more detail within the scope of a rehabilitation planning in order to allow the development of corresponding measures.

PROJECT COMPONENTS AND
TECHNICAL DATA

Catchment area = 28.7 km²
Dimensioned for a centennial flood Q₁₀₀ = 45 m³/s
Design flow = 53 m³/s
Standard discharge = 4 m³/s
Retention volume ~ 110,000 m³
Height of flood defence structure:
4.5 m
Type of flood defence structure: earth dam

BRIEF DESCRIPTION

Safety report and detailed safety assessment for the flood control reservoir between St. Georgen and Schallstadt

CLIENT

Eigenbetrieb Stadtentwässerung Freiburg

FINANCING

Eigenbetrieb Stadtentwässerung Freiburg

SCOPE OF SERVICES

Processing of flyover data, preparation of a Digital Terrain Model
Analysis of the reservoir's hydraulic functionality
Geotechnical investigation
Safety report and detailed safety assessment in accordance with DIN standard 19700
Detailed investigation of the spillway
2-D dam break model
Restoration of migration possibilities for fish and other aquatic organisms
Wind expertise and freeboard calculations
Remediation planning
Construction of a fish passage
Construction supervision

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