To ensure that the aftercare measures at the Bischofferode site are safely completed and to protect the Bode, Wipper and downstream receiving waters, the Bode must not be allowed to cross over onto the dump site. The planning of this hazard prevention measure in connection with the ecological specialist planning and the compensation of possibly reduced retention space is the subject of the engineering service advertised here.
The flood protection concept from 2020 (Appendix 1) with a comparison and evaluation of the possible variants for these special site conditions with consideration of how to deal with / compensate for the loss of retention space is the basis of this task.
Task
To ensure that the aftercare measures at the Bischofferode site are safely completed and to protect the Bode, Wipper and downstream receiving waters, the Bode must not be allowed to cross over onto the dump site. The planning of this hazard prevention measure in connection with the ecological specialist planning and the compensation of possibly reduced retention space is the subject of the engineering service advertised here.
The flood protection concept from 2020 (Appendix 1) with a comparison and evaluation of the possible variants for these special site conditions with consideration of how to deal with / compensate for the loss of retention space is the basis of this task.
Planning approaches
The existing flood protection concept (Annex 1) is to be used as a planning basis (see point 5.2).
As part of the preliminary planning, it must be checked to what extent further alternatives for flood protection are possible and feasible; the comparison of variants in the form of a feasibility study is part of the preliminary planning documents.
The flood protection to be planned should guarantee a safe service life of at least 50 years, corresponding to the local situation (salty water).
The northwestern dump area to be secured by flood protection is a retention area that has the status of a temporarily secured floodplain. Variants of the retention space compensation are to be considered in the form of a feasibility study with consequences and effort.
With the above-mentioned feasibility studies on the measures of flood protection and retention area compensation, the client must provide the client with a basis for decision-making.
In addition to a comparison of the implementation options with regard to costs and construction time, the necessary measures relating to nature conservation, land acquisition, retention area compensation and the ability and duration of approval must also be considered and assessed.
Services to be provided General requirements for the provision of services
Planning for the implementation of flood protection at the Bischofferode location is expected, which is based on the existing requirements.
The scope of the planning should be based on the service profiles of the HOAI 2013 mentioned in Section 5.4. Accompanying the planning, hydraulic models for the effectiveness of the preferred flood protection variants in combination with retention area compensation are to be created.
Performance approach
The proposal mentioned in the flood protection concept (Annex 1) for the construction of a flood protection wall in connection with retention space compensation by removing or moving the dump material of the so-called "sludge ponds" is selected as a preliminary performance approach.
Calculation of fees
With the offer, the preliminary fee calculations for the planning services are to be created on the basis of the provisionally chargeable costs of the service provision.
The billing of the fees is regulated in the enclosed engineering contracts.
The provisionally chargeable approaches / costs listed here were determined in the context of preliminary studies or taking into account current comparable projects and are used for the preliminary calculation of fees.
LBP 12 hectares
Property planning / outdoor facilities EUR 850,000
Engineering structure / flood protection EUR 325,000
Planned project flow / stages and sections
The following planning services are tendered in batches.
- Lot 1 - accompanying landscape conservation plan,
- Lot 2 - Project planning / outdoor facilities (retention area compensation) Project planning / engineering structure / flood protection,
- Lot 3 - Geotechnical consulting services,
- Lot 4 - hydraulic model.