Straight Channel and Riffle Pool Channel Project

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Engineering

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Reach length Riffle-Pool-Riffle 48.85 17 m3/sec Oulette Creek, Canada Design bankfull flow of 17 m3/sec at the river sation 48.85 boundary conditon upstream downstream Mixed flow regime critical depth critical depth River Sta 48.85 37.81 37.71 12.71 12.61 11.14 0 Min Ch El (m) 2.36 1.25 1.25 0.47 0.47 1.21 0.1 Oulette Creek, Canada Design bankfull flow of 17 m3/sec at the river sation 50.32 boundary conditon normal depth with a slope of 0.03 normal depth with a slope of 0.03 upstream downstream River Sta upstream downstream 50.32 48.85 37.81 37.71 12.71 12.61 11.14 0 Min Ch El (m) 1.62 1.58 1.25 1.25 0.47 0.47 0.43 0.1 0.04 0.33 50.32 0 2 3 8 11 13 22 26 5.12 5.02 1.72 1.62 1.72 3.52 3.82 5.72 48.85 0 2 3 8 11 13 22 26 5.08 4.98 1.68 1.58 1.68 3.48 3.78 5.68 37.81 0 2 3 8 11 13 22 26 4.75 4.65 1.35 1.25 1.35 3.15 3.45 5.35 Chart Title 7 6 5 4 3 2 1 0 0 5 10 15 Chart Title 20 25 30 EENV 414/514 Exam#2 Take home – HEC-RAS Name: Total points: 15; Due date: 11/15/2021 at 1pm. late submissions will not be accepted. Submit this sheet with your signature at the bottom. Keep the HEC-RAS files. I may ask you to submit them. Data given: “HEC-RAS Exam 2” folder. SI units. The goal of this activity is to evaluate how stream design parameters change when we convert a “straight channel” (Existing condition) into a “Riffle-Pool channel” (Proposed condition). Using the given data develop two HEC-RAS models – one for “existing condition” and the other for “Proposed condition”. This problem is based on real world data so your answers should be reasonable. Questions: 1. Develop graphs in excel comparing the following stream design parameters for “existing” and “proposed” conditions. Format your graphs appropriately for full points. 1.1 Longitudinal stream bed elevation 1.2 Water Surface Elevation 1.3 Shear stress 2. Compare “existing” and “proposed” and write couple of comments on how the parameter changes when we move from “straight” to “riffle-pool” sections (i.e., whats the maximum shear stress, how does the depth change, slope etc.). 3. For both models, what is the reach minimum and maximum shear stress values? “Riffle-Pool channel” (Proposed condition) 4. What is the total elevation drop over the reach? Of this elevation drop, in one Riffle-Pool combination, what percentage is allocated to riffle and what percentage is allocated to pool? Refer to the Chapter 1 riffle-pool design problem. Compare length of riffle vs length of pool. I declare that the solutions presented for this take home exam were prepared by me and adhere to the “Academic Dishonesty” policy section outlined in the courses syllabus. _______________________ Signature
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Anonymous
Excellent! Definitely coming back for more study materials.

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