Design Assignment1 _(HEC-RAS)_15%1. In HEC RAS software, draw an open channel of 300 m having eight cross-sectionsshown in Figure 1. Simulate the water levels throughout the channel for theestimated flow shown in Table 1. Initially, Manning’s n for the main channel andfloodplains are 0.03 and 0.10 respectively. If the channel bottom is changed toconcrete (n = 0.013) from chainage 125 to 150, compare the flood levels of thesection. Table 1: Peak discharge from XP RAFTS5th Numeral(from Left) inyour StudentNumberPeak discharge (m3/s)10 year ARI50 year ARI01525118232162631324412255182662028722308243292535 Show the flood profile along the channel. Also, mention the flood levels in the two lowermost sections. Please be noted that for the cross-sections mostly height and width valuesare given. Regarding RL, ONLY for the channel bottoms are provided.Notes:1. You can assume some other necessary values; however, you need to mention thoseassumed values in the report.2. Please be noted that your report (hard copy) should be self-explanatory with all theassumptions, results, graphs and discussions. Electronic submissions are ONLY forback-up and cross-checking. Electronic files will not be primarily used for marking.Design Assignment1 _(HEC-RAS)_15%Figure 1: Cross-sectional data for the channelDesign Assignment1 _(HEC-RAS)_15%In second part, you must prepare a hydraulic model using HEC RAS software for 300 mhaving eight cross-sections shown in Figure 1. You must simulate the water levelsthroughout the channel for the estimated flow shown in Table 2. The Manning’s n valuesfor the main channel and floodplains are 0.013 and 0.10 respectively. Table 2: Peak discharge from XP RAFTS5th Numeral(from Left) inyour StudentNumberPeak discharge (m3/s)10year ARI50year ARI01525118232162631324412255182662028722308243292535 It has been decided that there will be a road construction crossing over the river.Therefore, the authority has decided to build pipe and box culverts in between chainages125 and 150 to facilitate flow.Select appropriate pipe and box culverts. Show the flood profile along the channel afterthe construction of the culverts. Also, mention the flood levels in the two lower mostsections.Notes:1. You can assume some other necessary values; however, you need to mention thoseassumed values in the report.2. Please be noted that your report (hard copy) should be self-explanatory with all theassumptions, results, graphs and discussions. Electronic submissions are ONLY forback-up and cross-checking. Electronic files will not be primarily used for marking.Design Assignment1 _(HEC-RAS)_15%Marking Guidelines for this assignment.Brief Summary – 1 MarkFlood Profiles – 3 MarksImpact on flow with changed n values- 1.5 MarksFlood level in 2 lower most sections- 1.5 MarksFlood profile after construction of pipe or box culvert- 2 MarksHEC RAS File – 4 Marks (with all necessary files)Clear stating of necessary assumptions- 1 MarksOverall Presentation – 1 MarksNotes:Brief Summary means explaining in the context of the assignment, how (within minutes) HEC-RASsoftware enabled you to look at the different ARIs flow profile and how you were able to compare flowfor different manning’s value. Also, you can highlight the use of the software to estimate a flood profilefor a hydraulic structure like culvert and conclude the flow conditions of the structure and check whetherit will be safe for 10 years ARI or 50 years ARI.Please make sure to include all necessary screenshots like setting of cross sections of channels, simulationof flow from those cross sections, flow profiles for changed ‘n’ values of the main channel from 120 to150 chainage, the flood profile along the channel, flood levels in the two lower most sections.Overall presentation means well formatted report with good English language, easy to understand withproper labelled screen shots. Avoid typos as much as possible. Try to use some references to support yourexplanations.
