A tidal model has been made with horizontal scale ratio of 1:7000 and vertical scale ratio of 1:350. What is the period in which a tide of its natural period 8 hour can be simulated in the model?
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- In a tidal model, the horizontal ratio adopted is 1 in 4800. A 12-hour tide is intended to be reproduced in the model in 3 minutes. What should be the depth scale?(Civil engineering hydrology)2.12 The data from an isohyetal map of a 24-hour storm is given below. Assuming that the storm centre had an area of 25 km², obtain the Depth-Area curve of this store. Using the depth-area curve, estimate the average depth of rainfall over an area of 2400 sq. km. It can be assumed that the storm centre is located at the centre of the area. Isohyet (mm) 21 20 19 18 17 16 15 14 13 12 Enclosed area 543 1345 2030 2545 2955 3280 3535 | 3710 | 3880 3915 (km²)
- :A-Explain the following briefly Two only. 1-The methods of determination of average precipitation over an area. 2-What are the factors affecting flood Hydrograph? 3-What are the basic assumptions for deriving the unconfined aquifer equations? B: The normal annual precipitation of five rain gauges stations P, Q, R, S and T are 120, 100, 80, 110, and 140 cm respectively. During a particular storm the precipitation recorded by stations P, Q, R, and S are 15, 10, 7, and 11 respectively, the instrument at station T was inoperative during the storm. Estimate the rainfall at station T during the storm.I need the answer as soon as possible2.15 The mass curve of rainfall in a storm of total duration 90 minutes is given below. (a) Draw the hyetograph of the storm at 10 minutes time step. (b) Plot the maximum intensity-duration curve for this storm. (c) Plot the maximum depth-duration curve for the storm. Time (Minutes) |80 10 20 30 40 50 60 70 90 Cumulative rainfall 0 |(mm) 2.1 6.3 14.5 21.7 27.9 33.0 35.1 36.2 37.0
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