Rainfall Runoff modelling using HEC-HMS.pptx

Rainfall runoff modelling

1. Rainfall Runoff modelling using HEC-HMS ​ Submitted to- Dr. Abhishek Submitted by- Shikhar Verma

2. Agenda 1 2 3 4 5 Study Area Selection of watershed Steps involved in modelling Parameters estimation Results 2 Presentation title 20XX

3. 3 Study Area : Southern part of Bihar, near Sone River. (Outlet-  25.214, 84.826., Area- 4,100 km² ) Watershed Area : Covers 4,100 km² near the Sone River, a tributary of the Ganga. Location : Situated between latitude 25.214 and longitude 84.826 in southern Bihar , near the Sone-Ganga confluence . Elevation : Ranges from approximately 100 to 250 m above mean sea level . Flooding History : Known for frequent monsoon flooding due to heavy seasonal rainfall and sedimentation in the Sone River. .

4. 4 Rainfall : Monsoonal climate, with an average annual rainfall of 900-1,200 mm . Significant runoff occurs during monsoon months (June-September). Land Use : Primarily agricultural , with rice, wheat, and sugarcane cultivation. Increasing rural settlement density near the riverbanks. Hydrological Challenges : The absence of major water regulation structures within the immediate watershed increases flood vulnerability. Modeling Consideration : Ideal for HEC-HMS modeling due to seasonal flooding risks and agricultural importance, with a focus on flood mitigation and runoff management.

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6. By Thursday night, Sone River is expected to rise by 40+ cm compared to today at noon. Use caution if going near the riverfront. 6 Presentation title 20XX

7. 7 Delineated a watershed of 4100 km² (1,600 sq. miles) with an outlet near coordinates: Latitude:25.214, Longitude:84.826 Selection of Watershed

8. Steps Involved

9. 9 Presentation title 20XX DEM file of selected basin Shape file of watershed Step 1: Clip the DEM file of the selected watershed from the krishna basin using Q-GIS software

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12. Basin Model Setup Step 2 : Define Basin Boundaries Import GIS data to delineate watershed boundaries Use tools like Q-GIS or Arc-GIS for GIS integration After applying flow direction and flow accumulation. Watershed boundaries

13. Adding Sub-Basins and Reaches Step 3 : Subdivide the watershed Add sub-basins: Components > Basin Model > Add Sub-basin Define river reaches: Components > Basin Model > Add Reach The catchment is divided into 89 sub-basins and 9 reaches.

14. Meteorological Model Setup Step 5 : Input Rainfall Data Historical data, synthetic storms, or real-time data. Create a meteorological model: Components > Meteorological Model

15. Linking Meteorological Model Step 6 : Link to Basin Model Specify rainfall distribution over the basin. Assign the meteorological model to the basin model.

16. Control Specifications Step 7 : Define Simulation Period Set start and end times: Components > Control Specifications. Define the time step for simulation

17. Model Parameters Step 8 : Choose Loss Method We choose SCS Curve Number method Step 9 : Select Transform Method We choose SCS Unit Hydrograph.

18. Average value of curve number for the sub-basins from Google Earth 18 Presentation title 20XX

19. Sub-basin characteristics 19 Presentation title 20XX

20. Lag Time Computations (0.6 times of Tc) 20 Presentation title 20XX

21. Excel sheet for Lag time computations 21 Presentation title 20XX

22. Parameters feed into software 22 Presentation title 20XX

23. Running the Simulation Step 11 : Link All Components Ensure basin model, meteorological model, and control specifications are connected Step 12 : Execute Simulation Run the model: Compute > Create Simulation Run > Select Components > Compute

24. Source-Hydrologic modelling channel 24 Presentation title 20XX

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28. 28 Presentation title 20XX Outflow Baseflow Soil infiltration Excess Precipitation Precipitation Cummulative Outflow Sub basin

29. 29 Presentation title 20XX Outlet

30. Thank you

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33. Quarterly performance 33 Presentation title 20XX

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