111Equation Chapter 1 Section 1 College of Science and Engineering TIME CONSTRAINED ASSESSMENT BSC (HONS) CIVIL ENGINEERING LEVEL SIX CIVIL ENGINEERING HYDRAULICS 6HX509 (RESIT) DATE: JULY 17, 2021-RESIT 2021 TIME ALLOWED: 3 Hours within the scheduled 24 Hours (this time includes completing the assessment and uploading to Blackboard Turnitin submission point) PAGE / WORD COUNT: 10 (note that pages/words in excess of this will not be marked) Instructions to Candidates Assessment specific instructions (amend and add points as necessary) Student instructions for examination replacements in July 2021 This is an Open Book Time Constrained Assessment.You should ensure that you are able to sit in a quiet undisturbed place, with internet access, power and a reliable PC/laptop.In advance of the assessment, you should ensure that you have a copy of any software you intend to use, such as Word or Excel and free scanning software if required. Microsoft Office applications (Word and Excel) can be downloaded from your online student area.You have 3 hours to complete this open book time constrained assessment. We will use Blackboard Tracking to determine when you accessed the paper. As you have now downloaded the paper, you will now have 24 hours to undertake your attempt and submit your answers.The time includes:3 hours to complete the assessment, and one additional hour to download the paper and to upload your answer file into Turnitin submission point.To allow for any additional issues with tackling the online assessment, including time difference from your location and the UK, you have been given 24 hours window to start and finish your assessment. This allows for a range of scenarios that may affect students.If you are entitled to additional time on a support plan, you can have the additional time on top of the 3 hours for completing the assessment. If this presents difficulties, alert your module leader and the staff who co-ordinate your support plan.If you experience a technical issue with your exam, please contact IT Services via Web link: http://www.derby.ac.uk/its/students/help/Email: [email protected]Telephone No: 01332 591234 (internal x1234) Please provide them with the module code and title and a description/screenshot of the error or problem. Academic support – You may seek academic support from the assigned invigilator/module tutor for the following:- Clarification of unclear or contradictory text within a question.Clarification of marks available for a question or section of a question.Clarification of symbols, equations, constants and fixed values where provided within the exam paper and/or exam question. The assigned invigilator/ module tutor does not have to answer your question if they determine that it would provide you with an unfair advantage or it is outside of the parameters defined above. As with any other assessment submission, you are responsible for submitting your work on time. If it helps, you could set a timer for the duration of the assessment to remind you how much time you have left.You may submit your answers using Word or PDF. For handwritten work, you should only use black or blue colour pen and should not use pencil. You may submit only one single file to Turnitin. For example, for Turnitin if you do some working in Excel that you want marking and/ or scanned drawings, ensure you cut and paste them into Word. Please do not email lecturers with additional workings or explanations, everything you want to be considered for marking must be a single file. There can be no exceptions to this.If handwritten workings are used – these must be in black or blue ink and legible. You may either scan or photo them and paste them into a single file. The writing must be legible (you may want to trial this beforehand). If the work cannot be read, it cannot be marked.You should name you answer file to include your student ID and module code, e.g. 6HX509_123456789.docs. DO NOT type your name in the document or in the file name. This is to ensure that we can mark your submission anonymously.Once completed, upload the file in the Turnitin Link provided on the Blackboard module page, within the 24 hours. This is your responsibility. Please ensure that you save your work regularly during the assessment in case of problems. You will only be able to upload your file once (you cannot resubmit).By submitting this assessment, you are declaring that this is your own work and has not been copied (in part or whole) from any other source except where appropriately acknowledged. UNIVERSITY OF DERBY Faculty of Arts, Design and Technology RESIT EXAMINATION PAPER BSC (HONS) CIVIL ENGINEERING TOP UP LEVEL SIX Civil EnGINEERING HYDRAULICS: 6HX509 DATE: JULY 17, 2021 EXAM START: 10 AM EXAM END: 10 AM NEXT DAY TIME ALLOWED: 3 HOURS Instructions to Candidates 1. Answer ALL questions. All questions carry equal marks. DO NOT TURN OVER UNTIL INSTRUCTED Question 1: Stilling basin The stilling basin is a hydraulic structure located between the outlet works of a dam and the tailwater, to where, should return excess flows safely. On it, the hydraulic jump is generated, dissipating energy, supporting the actual shear stress on the bottom bed without scour. Water is flowing under a sluice gate, and it is discharging into a rectangular stilling basin (Figure 1). Given the following data: q = 34 m3/s/m HL = 1.00 m Tw = 8.30 m B = 21.80 m where q is the unitary discharge; HL, the head loss; Tw, the tail water depth; and B the width of the stilling basin. Determine the following stilling basin parameters: The stilling basin length (LB). [3 marks]The chute blocks height (Hc). [3 marks]The chute blocks width (Wc). [3 marks]The number of the chute blocks (NB). [3 marks]The distance adjacent to stilling basing wall (Lwall). [3 marks]The stilling basin height (HB). [3 marks]The spacing between chute blocks (Wc). [3 marks]The height (C) and top thickness of the end of the still. [2 marks]The thickness of the side walls (Z). [2 marks] [Total marks: 25] Figure 1. Stilling basin sizing and parameters detailing Question 2: Box Culvert Design A culvert is a structure that allows water to flow under a road, railroad, trail, or similar obstruction from one side to the other side. Typically embedded so as to be surrounded by soil, a culvert may be made from a pipe, reinforced concrete or other material. An existing box culvert is 1.50 m wide (bbox), 1.20 m high (hbox) and 35.0 m long (L), and has a slope (Sbox) of 0.005. There is a trash screen at the inlet with 12 bars of 20 mm diameter in a 1.90 m wide rectangular channel. The downstream channel is rectangular, 3.50 m wide (Bchannel) and 1.0 m depth (hchannel) with a bed slope (Schannel) of 0.0007 and a Manning’s roughness coefficient (n) of 0.025. The maximum allowable headwater depth is 2.10 m (hmax) For this box culvert: Calculate the maximum discharge in the culvert using Manning’s equation. [3.0 marks]Calculate the tail water depth for this flow, i.e. in the channel downstream. [3.0 marks]Calculate the inlet losses (hinlet) assuming k as 0.5 [2.5 marks]Calculate the friction losses (hfriction) considering the friction slope (Sf) equal to the bed slope of the culvert (Sbox), i.e. Sf=Sbox [2.5 marks] Calculate the losses at the screen (hscreen) assuming k as 1.5, and depth as hmax=2.10m [2.5 marks] Calculate the losses at the outlet (houtlet) assume k as 1 [2.5 marks]Calculate the total head losses (htotal) [2.5 marks]Obtain the difference in water levels between upstream and downstream (htotal-2) [2.5 marks] Compare the total head losses (htotal) with the difference in water levels between upstream and downstream (htotal-2). What can you do to match both results? [4.0 marks] [Total marks: 25] Question 3: Pumps In hydraulics engineering, a pump is a device that moves water in a pipe system by mechanical action. The capacity of each device is defined by the manufacturer, providing the wheel speed, and the relationship between hydraulic head (H), discharge (Q) and power (P). The equation of a pump when running at 1000 rev/min is given by: 22* MERGEFORMAT () where Hm is the water column head expressed in meters; and Q, the discharge in m3/s. When installed in a system in which the static lift (Δz) is 20 m, it delivers 0.05 m3/s. The constant of the pump (k) is 5600. Plot on Figure 2 the head (Hm) vs. discharge(Q) curve based on equation 2, from , producing at least 10 points. [5 marks] Plot the system curve (Hsys vs. Q) on Figure 2 (produce at least 10 points, from ). Where Hsys is the hydraulic head required by the arrange of pipes. See Appendix. [5 marks] When the pump is running at 900 rev/min, determine the new head (H2) vs. discharge (Q) curve. Plot it on Figure 2 (provide at least 10 points, from 0
