Tenders Are Invited For Engineering Services - Flood Polder Left Muldorland - Development Of A Qualified Expert Opinion On Determining The Mining Room Loss Loss On The Mulde Between Bad Düben (Saxony) And Bitterfeld (Saxony -Anhalt)

Engineering Services - Flood Polder Left Muldorland - Development Of A Qualified Expert Opinion On Determining The Mining Room Loss Loss On The Mulde Between Bad Düben (Saxony) And Bitterfeld (Saxony -Anhalt). + 3.1 Spatial And Temporal Demarcation Of The Investigation Area: The Delimitation Of The Study Area Should Be Derived From The Consideration Of The Historical Floodplain And Professional Reviews To The Retention Room And Historical Flood Marks. The Importance Of Previous Retention Space Optimizations By Flood Polder And Dyke Back Laying Must Be Included In The Evaluation And Demarcation. This Means That An Analysis Of The Effect And Spatial Extension Of The Polder Locations Already Implemented Must Be Carried Out. . + 3.2 Determination Of The Historical Aue (Retention Room) Of The Mulde As A State Of Reference: For The Area Of ​​Investigation Specified In 3.1, The Historical Aue Of The Mulde And The Relevant Tributaries Must Be Determined In Order To Be Able To Define A Reference (Original State Before Mining Interventions) To The Current Retention Room. The Basis For This Can Form Different Historical Maps. They Show The Pre -Mining Land Use Including Historical Water Runs And The Aue Of The Mulde. To Determine The Historical Floodplain (Retention Room), The Mining Cracks From The Lmbv Archive Are Also Included. In Addition, It Must Be Checked Whether Other Technical Basics Are Suitable For Determining The Pre -Mining Floodplains Or Can Be Used In Addition. It Must Be Examined To What Extent A Digital, Pre -Mining Terrain Model Can Be Created And Is Expedient For The Task. The Methodology For The Derivation Of The Pre -Mining Floodplains Must Be Developed And Presented To The Client For Confirmation. . + 3.3 Determination Of The Current (Todays) Floodplain Areas-Current State: A Suitable Proposal Must Be Developed To Determine The Current Floodplain Areas In The Reference Area. In Principle, It Is Assumed That The Examination Of Large Flowing Waters Forms Information About Dyke Courses And The Designated Flood Areas. . + 3.4 Comparison Of Pre -Mining Floodplains With Current Floodplain Areas: In The Comparison Of The Historical, Pre -Mining Floodplain Areas With The Current, Recent Flows, It Must Be Worked Out How High The Loss Of Floodplain Areas Is. . + 3.5 Research Of Historical Flood Marks And Flood Events: The Historical Flood Marks And The Flood Events (Flood Gear Line) That Have Occurred Must Be Compared With Todays Drainage Scenarios (Hqt). It Is A Comparison Of The Hazard Potential Earlier And Today. . + 3.6 Determination Of The Loss Of Retention Space: The Results From The Research Provide The Basis For Calculating The Loss Of Retention Space, Which Was Created As A Result Of Lignite Mining And Is No Longer Available As A Retention Room. It Must Be Determined Whether There Is A Mining Of The Retention Space Compared To The Actual State And If So It Is To Be Quantified. The Result Is To Be Opened