Project 1

OBJECTIVE: The purpose of this project is to select a river which is having it's length greater than 10 km.Then to enter it's crosssections and use toposheet for catchment area calculations and to use Unit Hydrograph method for catchment area calculations.To run the river model for different profiles by considering steady flow analysis.

STEP 1:Create and Name a new project in HEC-RAS and change the units to SI units ,then save that project as shown.

STEP 2:Now draw the considered river in geometric editor using river reach option in HEC-RAS as shown and save the geometric data.then the main

main window will appear as shown.

After completion of drawing the river,double click at the end then a pop up will appear and mention the river name and reach name.

STEP 3:CLICK ON CROSS SECTION ICON AND GO TO OPTIONS AND SELECT ADD A NEW CROSSECTION THEN NAME A NEW CROSSECTION AS SHOWN.

STEP 4:THEN PLACE THE REFERRED MANNINGS VALUES AND REACH LENGTHS FOR THE PARTICULAR CROSSECTION FROM THE ATTACHMENT

Then click on apply data then data will be projected in the plot as a graph and then place main channel bank stations from the graph as shown and click apply data.

then enter various crosssection data and apply that data

after entering all the croosection data the geomertic data will appear as shown.

then save the geometric data.

STEP 5:to find catchmenent area

Download the required toposheet from SOI Nakshe from google

Open autocad and draw the shape of catchment area by inserting the toposheet as shown below

Then draw a catchment around the river using line command in autocad as shown

Now copy the catchment area and select the copied catchment area and see its properties as shown

then find its catchment area as shown

here the catchment area is 18714661484.6729 square meters

STEP 6:find the 25 year flood calculations as shown

find the Length of Stream from origin To Site i.e.,draw the length of river and click on its properties and find it's length as shown

here the length of stream to site is 301137.1505 meters

Now find the centroid of the catchment area using massprop command in autocad to get Length of Stream from perpendicular on centroid to site as shown below

here centroid is X: 1912721.8996
Y: 980772.0550

now draw a perpendicular from centriod to the length of river as shown

Now find the Length of Stream from perpendicular on centroid to site as shown

here

Length of Stream from perpendicular on centroid to site is 131150.4412 meters

Now find the catchment area and general parameters of river kinnerasani

Find rainfall calculations:

in this ,find location of project using goolge earth pro

and find rainfall from isopluvial maps of that particular location

and find reduction factor from flood estimation report

TIME DISTRIBUTION OF CUMULATIVE HOURLY RAINFALL
	Design storm duration			3.00	Hours

unit hydrograph is as shown

STEP 7:FIND 100 YEAR FLOOD CALCULATIONS