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Rainfall Runoff modelling using HEC-HMS.pptx
- 1. Rainfall Runoff modelling using HEC-HMS Submittedto- Dr. Abhishek Submitted by- Shikhar Verma
- 2. 2 Presentation title Agenda 12 3 4 5 Study Area Selection of watershed Steps involved in modelling Parameters estimation Results 20XX
- 3. 3 Study Area: Southernpart of Bihar, (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 watershedof 4100 km² (1,600 sq. miles) with Latitude:25.214, Longitude:84.826 Selection of Watershed
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- 9. 9 Presentation title20XX 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 Step2: 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 Step3: Subdivide the watershed • Add sub-basins: Components > Basin Model > Add Sub • Define river reaches: Components > Basin Model > Add • The catchment is divided into 89 sub-basins and 9 reac
- 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 ofcurve number for the sub- basins from Google Earth 18 Presentation title 20XX
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- 20. Lag Time Computations(0.6 times of Tc) 20 Presentation title 20XX
- 21. Excel sheet forLag time computations 21 Presentation title 20XX
- 22. Parameters feed intosoftware 22 Presentation title 20XX
- 23. Running the Simulation Step11: 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 24Presentation title 20XX
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- 28. 28 Presentation title20XX Outflow Baseflow Soil infiltration Excess Precipitation Precipitation Cummulative Outflow Sub basin
- 29. 29 Presentation title20XX Outlet
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- 33. 33 Presentation title Quarterlyperformance Q4 Q3 Q2 Q1 0 1 2 3 4 5 6 Series 1 Series 2 Series 3 20XX
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