Challenge

Project 1

PROJECT 1

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:

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

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

Ship work like this
in your own course.