1. Flood Plain Modelling

2. Flood Plain Model Options Flood Plain Model Options: 1 - D : 1 - D : - Lump River and Flood Plain as Single branch ( Limitation: Same Water Levels in River and Flood Plain) Quasi 2-D: Quasi 2-D: - River and Flood Plain separate Flow Paths - Requires accurate and detailed Data - Relevant for: Flood Mapping, Flood Plain Inundation and Drainage Modelling Flood Damage assessments

3. One dimensional flood flows

4. Two dimensional flood flows

5. Do the spill areas convey significant flow discharges ? Does the river spill? Flood plain model not needed Are levees present ? Are spill flows conveyed parallel to the river ? Flood Cell with link channel Are levees present ? Additional Flooded Area Flood plain attached to cross section Is the flood plain flow frequent interrupted by roads and other flow obstructions? Interlinked Flood CellsRouting Channels 1-D Q 2-D N Y N N N N Y Y Y Y Y N START

6. RIVER MODEL 1D RIVER CROSS-SECTIONS Flood Plain Modelling

7. SCHEMATIZATION (1 DIMENSION) LOOPED RIVER NETWORK TRIBUTARIES Flood Plain Modelling

8. SCHEMATIZATION OF FLOODPLAINS (QUASI 2D) PARALLEL RIVERS FLOODED AREAS LINK CHANNELS Flood Plain Modelling

9. Channel Center-Lines SCHEMATIZATION (1 DIMENSION)

10. Non-Channel Flow Axes SCHEMATIZATION OF FLOODPLAINS (QUASI 2D)

11. Inundation Flow Network

12. Integrated Flood Plain

13. Flood Plain Schematisation Flood Plain Description, definitions: RiverFlood plain RiverFlood plainRiverFlood plain RiverFlood plain ? FP2: Add. Storage FP3: Part of Cross section FP4: Separated from River FP1: Ignored Link channel

14. Flood Plain Schematisation FP1 : FP2 : FP3 : FP4 : ? ?

15. MIKE 11 Descriptions: FP2 and FP3 FP2 Add. Storage area in processed data Processed data table FP3 Relative Resistance in raw data Raw data view

16. Link2 Channel 1Channel 2 Channel 3 Link Channels (Network Tabular View) River channel and floodplains modelled separately. Link channels define flow exchange properties Link1 MIKE 11 Descriptions: FP4

17. River-Floodplain Flow Exchange U/S Bed Level D/S Bed Level U/S Chainage D/S Chainage Link Structure Connection to River Branch Connection to Floodplain Cell or Branch Longitudinal Parameters of a Link Structure River Floodplain Manning's Coefficient

18. Flood Plain Inundation Flood Plain Inundation, definitions: No Flooding: FL1 : Local Rainfall Flooding FL2 : Flooding via Khals FL3 : Flooding via Levees River Khal High ground No Flooding FL3FL2FL1

19. Flood Plain Drainage Flood Plain Drainage, definitions: DR1 : Drainage via Channel DR2 : Drainage via Levees Flood Plain River Levee Flood PlainRiver Channels DR1 DR2 Flood Plain Inundation, definitions:

20. Storage calculated from cross section width dx 1 2 1 /2dx 2 /2 b 1 b 2 b 3 A s =b 2 (dx 1 /2+dx 2 /2)

21. User Defined Storage

22. Total Surface Storage Total surface storage =Storage width. dx + Add. Storage Area

23. Flooded Area