The figure below (Figure 1-15 in the book) Intensity-Duration-Frequency (IDF) shows curves for Houston, Texas. What is the rainfall intensity (in./hr) for the storm with a 2 hr duration and return period of 10 years? Rainfall intensity (in./hr) 20.0 15.0 10.0 8.0 6.0 4.0 2.0 1.0 0.8 0.6 0.4 0.2 0.1 0.08 0.06 0.04 0.02 5 10 Houston, Texas, 1910-1951 Note: Frequency analysis by method of extreme values, after Gumbel (1958) Period return (yr) 100 15 20 30 40 60 (min) 2 Duration 3 4 5 6 8 10 12 18 24 (hr)

The figure below (Figure 1-15 in the book) Intensity-Duration-Frequency (IDF) shows curves for Houston, Texas. What is the rainfall intensity (in./hr) for the storm with a 2 hr duration and return period of 10 years? Rainfall intensity (in./hr) 20.0 15.0 10.0 8.0 6.0 4.0 2.0 1.0 0.8 0.6 0.4 0.2 0.1 0.08 0.06 0.04 0.02 5 10 Houston, Texas, 1910-1951 Note: Frequency analysis by method of extreme values, after Gumbel (1958) Period return (yr) 100 15 20 30 40 60 (min) 2 Duration 3 4 5 6 8 10 12 18 24 (hr)

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

A rainfall hyetograph shows a) the total volume of rainfall for a storm event; b) the cumulative volume of rainfall with time over the duration of a storm event; c) the variation of rainfall event over a watershed; d) the intensity of volume of rainfall as a function of time; e) none of the above
Hope your help hydraulic CEE 340
Q2 (b) A 240-minute storm is recorded with the mass curve in Table Q2-2. (i) Calculate the incremental depth of rainfall in the interval and intensity. (ii) Draw the hyetograph of the storm at 30-minute interval with graph paper in Appendix 1. (iii) Calculate the maximum intensity-duration.
A flood was measured from a catchment of 500 square kilometers. The direct runoff from this flood was found to be 3.25 cm. The time distribution of the rainfall is given below in Table. Find the W index for this storm by considering 0.5 cm Interception and depression storage losses. Also find total infiltrated volume of water. Q.2 Time (hr.) 4 7 Total rainfall 1.2 1.45 2.2 3.65 5.09 3.18 1.97 18.74
The incremental rainfall intensity data given in the table below were recorded at a gage located on a small urban watershed. Using a 0.5-hour time step: (a) Plot the rainfall Hyetograph. (b) Determine the total rainfall depth during the storm event. (c) If the runoff depth is 4.65 mm, find the phi- index in mm/ hr. Rainfall intensity data- Time (hr) 0- 0.5- 1.0- 1.5- 2.0- 2.5- 3.0- 3.5- 4.0- 4.5- 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 Rainfall Intensity 2 2.5 5 1.5 1 0.5 (mm/hr)
Problem 2. A storm had 3 successive 6-hr intervals of rainfall magnitude of 3.0, 5.0 and 4.0 cm, respectively. Time from the beginning 0 3 6 9 12 18 24 30 36 48 54 60 66 42 of the storm (hr) 6-hr UH ordinates (cumecs) 0 150 250 450 600 800 700 600 450 320 200 100 50 0 a. Plot the resulting DRH due to 3 rainfall events, assuming a phi-index of 0.20 cm/hr. • Recall that the phi-index represents the rate of infiltration. • The hydrograph plots RUNOFF rates, where runoff = precipitation - losses. Note that the rainfall magnitude is reported as total rainfall depth in 6 hrs, so convert infiltration as a total for every 6 hr period. b. Assuming a baseflow of 30 m3/s, what are the ordinates of the storm hydrograph?
An effective rainfall of 2 hour duration produced a flood hydrograph peak of 200 m³/s. The flood hygrograph has a base flow of 20 m³/s. If the spatial average rainfall in the watershed for the duration of storm is 2 cm and the average loss rate is 0.4 cm/hour, the peak of 2-hour unit hygrograph (in m³/s-cm up to one decimal place) is
Do all of the following parts of the question
The following rainfall data in 5-minute intervals were recorded for a storm: Time (min): Depth (in) 5 :0.07 10 :0.20 15: 0.25 20: 0.22 25 :0.21 30: 0.16 35 :0.12 40 :0.03 a) plot the rainfall hyetograph as intensity (in/hr) versus time (min) b) calculate the maximum depth (in.) and intensity (in/hr) recorded in 5, 10, 20 and 30 minutes
A 20-minute rainfall event occurred at a small catchment (without any base flow), which has 2 branch rivers (or tributaries) with individual sub-catchments. This storm generated a triangular runoff hydrograph with peak flow of 139 L/s at the catchment outlet. Base of the triangular hydrograph was 1 hr 12 minutes. The rainfall distribution and other relevant data is given in Table 1. Assume that the rainfall was uniform over the subcatchments. Calculate the followings: i) Total rainfall volume fallen on the catchment. ii) Total runoff volume generated from the catchment during this rainfall event. iii) Average runoff coefficient for the whole catchment for that particular rainfall event. Table 1: Data for Question 1(b) Sub-catchment Catchment Rainfall No. Area (ha) (mm) 1 1.24 37 0.58 20
During a storm, the rates of rainfall observed at a frequency of 15 min for one hour are 12.5, 17.5, 22.5 abd 7.5 cm/h. If the phi-index is 7.5 cm/h, then the total run-off will be 1. 22.50 2. 15.00 3. 30.00 4. 7.50