What is a flow-duration curve? What information can v=be gathered from a study of flow-duration curve of a stream at a site?List the factors affecting the seasonal and annual runoff (yield) of a catchment. Describe the listed factors.

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What is a flow-duration curve? What information can v=be gathered from a study of flow-duration curve of a stream at a site?

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter16: Highway Drainage

Section: Chapter Questions

Problem 9P

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What is a flow-duration curve? What information can v=be gathered from a study of flow-duration curve of a stream at a site?
List the factors affecting the seasonal and annual runoff (yield) of a catchment. Describe the listed factors.

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Problem-1 A watershed is divided into sections as shown below. Runoff from each section will contribute to flow at gauge G as indicated in the table. For an excess rainfall intensity of 0.5 in/hr falling uniformly for 5 hrs, determine the resulting direct runoff hydrograph (DRO). D A C D Area [ac] 150 250 350 200 Time to G [hr] 2 4 G
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The ordinates of a 6h-UH of a watershed having a drainage area of 393 km^2 are given below. For a storm over the watershed having excess rainfall of 5 cm for the first six hours and 15 cm for the second six hours, compute the direct runoff hydrograph ordinates and plot the hydrograph. Compute the depth of direct runoff in cm. Assuming constant baseflow of 100 m^3/s, compute the storm hydrograph ordinates and plot the hydrograph. (List all the DRH ordinates in order, separated by a single space.)
1. The 1-hr unit hydrograph for a watershed is given below. Determine the runoff for the third time interval from this watershed for the storm pattern given. The abstractions have a constant rate of 0.3 in/h. Time (hr) Precipitation (in) Unit hydrograph (cfs) 1 2 | 3 4 5 0.5 1.0 1.5 0.5 10 100 200 150 100 50
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Problem 4.11. Assuming a dimesionless hydrograph is applicable, determine the duration of flow if the peak runoff is 8.5 m³/s (300 cfs) and the volume of flow is 100 mm (4 in.) for a 50-year storm from an 85-ha (210 ac) watershed. What are the coordinates for point n on the design hydrograph?
Question 3 A watershed of 35 km? was subjected to a storm of 1h duration from which the following information are recorded in Table 2. a) Obtain a Unit Hydrograph for this watershed knowing that the base flow in the stream is estimated at 2 m°/s. b) Derive and plot 4 hours Unit Hydrograph for the catchment area. Table 2: Data for the time and Discharge Time (hours) 01 2 3 4 5 6 7 Discharge (m³/s) | 2 15 30 37 30 22 16 12 2
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Q1. Based on 14 days runoff data given in TABLE Q1, determine the unit hydrograph for the catchment if the area is 4500 km2. Separate the baseflow by using appropriate method. TABLE Q1 Runoff Hydrograph Time (days) Runof(m's Time (days) Runoff(m's 1 II 2 10 4 4 2 15 12 2 6 18 13 7 16 14
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