Presentation by Manal Souadi (Hydraumet, Morocco), at the Delft3D User Days, during Delft Software Days - Edition 2022. Tuesday, 15 November 2022.

1. Flood early warning system in the Ziz basin, Morocco,
based on the Delft-FEWS Platform and the Delft3D FM Suite 1D2D
Hydraulic and meteorological engineering company
Société de Prestations Hydrauliques et Météorologiques
Delft3D User Days 2022

2. Presentation of Ziz basin
Area: 14000 Km²
Average precipitation: 150 mm
13 vulnerable areas
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3. Presentation of the flood early warning platform
Schematic of the platform
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4. Meteorological component of the platform
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• Meteorological model: Al Bachir
• Forecast data: Rainfall
• Spatial resolution: 7Km × 7Km
• Forecast lead lime: 72 hours
• Import and processing of rainfall forecasts in Delft-FEWS

5. Meteorological component of the platform
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Import of rainfall forecast of Al Bachir Model

6. Meteorological component of the platform
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Data processing
Interpolation
Calculation of forecast
rainfall average in
catchments

7. Meteorological component of the platform
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Average of rainfall forecast in each catchment

8. Hydrological component of the platform
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• Elaboration of the hydrological model using HEC-HMS
• Transformation of rainfall forecasts to flow hydrograph
• Calibration of HEC-HMS parameters (Curve number, initial abstraction, time
of concentration …) using observed events
• Integration of HEC-HMS models in Delft-FEWS
• Identification of canopy, surface, loss, transform and baseflow methods

9. Hydrological component of the platform
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Schematization of basins in
HEC-HMS

10. Hydrological component of the platform
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11. Hydraulic component of the platform
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• Elaboration of the hydraulic model using Delft3D FM Suite 1D2D
(version 0.9.9.52575)
• Integration of Delft3D FM models in Delft-FEWS
• Edition of the model inputs: Bed level, grid, upstream & downstream
boundaries, flow hydrograph, water level, manning coefficient, structures
(bridge, gate, weir…), simulation parameters…
• Elaboration of two-dimensional models

12. Hydraulic component of the platform
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Upstream boundary
Fixed weir
Observation
point
Observation cross
section
Bridge
Refined grid 5 m × 5 m
Downstream boundary
Grid 10 m × 10 m

13. Hydraulic component of the platform
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Gate
Bridge pillars

14. Hydraulic component of the platform
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Water Depth

15. Hydraulic component of the platform
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Velocity

16. Hydraulic component of the platform
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Flow & Velocity in observation cross sections
Flow
Velocity

17. Hydraulic component of the platform
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Water depth in observation points
Water depth

18. Hydraulic component of the platform
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19. Hydraulic component of the platform
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22. Recommendations
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• Possibility of integration of the bridge deck in the bridge structure
Bridge pillar
• Possibility of importing a high resolution digital terrain model in Delft3D FM
• Possibility of improving the performance of the model in order to simulate
fluently large areas with a small cell size of the grid

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