2 Marks 1 A Explain The Following Rainfall Related Terms Using Diagrams And Graphs To Illustrate Your Answer 1 Int 1 (64.8 KiB) Viewed 38 times
2 Marks 1 A Explain The Following Rainfall Related Terms Using Diagrams And Graphs To Illustrate Your Answer 1 Int 2 (64.8 KiB) Viewed 38 times
2 Marks 1 A Explain The Following Rainfall Related Terms Using Diagrams And Graphs To Illustrate Your Answer 1 Int 3 (64.8 KiB) Viewed 38 times
(2 marks) 1. a) Explain the following rainfall-related terms using diagrams and graphs to illustrate your answer: 1) Intensity Duration Frequency (IDF) curve; 2) Design rainfall event b) List the main rainfall abstraction processes and describe each of them. (3 marks) c) Estimate the 2 ha catchment's time of concentration and calculate its peak (10 marks) runoff rate for a 30 min storm with a return period of 20 years. Take a Manning's n for overland flow of 0.25, an average overland flow length of 60 m, and an average slope to the outfall of 0.5%. You are given the following relationships (nl) 0.6 te=6.99 (2)*(S.) 1820- 150 (t+8.96) 0.72 Where: Where: te is the time of concentration (min) iezo is the average excess nis Manning's overland roughness rainfall intensity (cm/hr) for a coefficient 20-year return period Lis the distance of the overland flow is the storm duration (min) path (m) le is the excess rainfall intensity (mm/hr) d) A soil has its infiltration capacity described by Horton Infiltration equation -fe+o-fe) with the parameter.fo = 200 mm/h. f. - 60 mm/h, and * = 4 min-1. If rainfall in excess of 200 mm/h is maintained for 50 min answer the following: 1. Write the infiltration capacity as a function of time. (2 marks) it. What is the infiltration capcity at the end of 50 min. (4 marks) III. How would this capcity be affected if the rainfall rate were less than (4 marks) 200 mm/h. Total marks for Question 1: 25 marks
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