Project 1

PROJECT 1

• Download toposheet from SOI Nakshe
• Convert the pdf to jpg to use in AutoCAD

AutoCAD:

• Launch AutoCAD and go to Insert -> Attach file and attach the image
• Identify any river in the toposheet and use Polyline command to sketch it
• Use List / Properties command to check the length of the stream drawn - Ls
• Draw the catchment area of that particular stream by using Polyline command and by connecting the ridges and carefully observing the tributaries / stream joining the major river drawn.
• Use List / properties command to check the area of the catchment drawn

• Copy the catchment area and river
• Convert catchment area to a region by using Region command
• Find the centroid of the Catchment area region by using Massprop command
• Copy the x and y coordinate of the centroid in notepad
• Use Line command and specify first point ( x coordinate followed by a comma and y coordinate)
• That will take you to a point (centroid)
• Draw a random line from that point and draw a circle around the centroid
• Find the nearest stream where the length between the centroid and stream is minimum
• Break the line by using break command
• Using List command find the length of the upstream as Lc

Google Earth Pro:

• Open Google Earth Pro
• Identify the river and go to Ruler - > Path
• Start tracing the river and save the river
• Find the RL of various points in the river

MS Excel:

• Open MS Excel and find the equivalent slope by filling in the required details
• Find the synthetic unit hydrograph coordinates (SUG) from the Central Water Commission flood estimation report of your basin
• From the isopluvial map for 25 years, find the average rainfall at your river region
• Find the reduction ratio and multiply it with the average rainfall
• Find reduction coefficient from the catchment area and find the areal rainfall
• Find the rainfall excess by identifying distribution coefficient
• Find the runoff by multiplying graph coordinates with the rainfall excess
• Final discharge = Direct runoff + Base flow
• Repeat the same for 100 years peak flow determination

HECRAS:

• Launch HECRAS
• File -> New Project. Enter the name of the new project and set the default project folder
• Click on geometry data editor and draw river reach.
• Go to Geometric editor-> Cross sections
• Options - > Add a new cross section
• Enter the chainage length in the box provided and click OK. Observe the given value under river stations box
• Enter the station and elevation details and reach lengths
• Enter the Manning’s n values
• Enter the bank details of the main channel

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Save Geometry data by clicking File -> Save Geometry Data

• Enter steady flow details by clicking on steady flow data icon
• Enter the number of profiles as 2
• Enter 25 year and 100 year peak flows under PF1 and PF2 respectively
• Click on Reach boundary conditions and enter upstream boundary condition as Critical depth and downstream boundary condition as normal depth by entering slope

• Save Flow data

• Run steady flow analysis by clicking on compute
• File-> Save Plan Data

• Click on cross sections and view the water depths due to peak flows
• Also click and view the Profile output and cross section output tables