Ехample 2-1 Rain falls as shown in the rainfall hyetograph (intensity Vs. time) in Fig. E2-1 (a). The o index for the Storm is 0.5 in./hr and is constant over5 hr. Plot the net rainfall on the hydrograph (flow vs. time) given in Fig. E2-1 (a). Determine the total volume of runoff and the watershed area. 1cfs 1.008 ac-in/hr 2.0 1.5 1.0 0.5 0 1 2. 4 5 Time (hr) 700 600 500 400 300 200 100 0 4 8 12 16 20 Time (hr) 24 Q (cfs) iT (in/hr)

Ехample 2-1 Rain falls as shown in the rainfall hyetograph (intensity Vs. time) in Fig. E2-1 (a). The o index for the Storm is 0.5 in./hr and is constant over5 hr. Plot the net rainfall on the hydrograph (flow vs. time) given in Fig. E2-1 (a). Determine the total volume of runoff and the watershed area. 1cfs 1.008 ac-in/hr 2.0 1.5 1.0 0.5 0 1 2. 4 5 Time (hr) 700 600 500 400 300 200 100 0 4 8 12 16 20 Time (hr) 24 Q (cfs) iT (in/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

Question 7 The total rainfall hyetograph of a storm, which took place over a basin is given below. Ordinates of Total Storm Hydrograph (TSH) obtained for the basin is given in the table below. The baseflow is constant and is 4 m³/s. If the depth of excess rainfall is 8 cm, determine: i (mm/hr) a) depth of direct runoff, b) depth of infiltrated water, c) -index, d) equation of surface runoff hydrograph in terms of UH₂ and lag times. e) UH2 ordinates of this basin, f) area of the basin. t TSH (hr) (m³/s) 0 4 24.68 뜨뜨뜨뜨뜨뜨 10 36 40 12 39 16 8 14 31 20 16 22 26 22 18 13 24 8 COL 4 5 20 Els 15 10 5 028 12 16 t (hr)
QUESTION 3 10 A storm with 10 cm precipitation produced a direct surface runoff of 5.8 cm in the equivalent depth unit. The time distribution of the storm is given in Table below. Estimate the @-index of the storm and the excess rainfall hyetograph. Time from start (hr) Incremental 0.4 rainfall in each hr (cm) 4 6. 0.9 1.5. 3.3 T.7 1.6 1.0 0.5
R The following table show the precipitation in (mm/hr.) observed at the rain gages (A, B, and C) which shown in figure belo 1. Find the average precipitation each hr. over the catchment by Thiessen method . 2. Draw a graphical relation between the average precipitation each hr. and the time. - 3. Find the (& and W- index), if the runoff volume=104.4 cm.km® thr.) 1 2 3 a 5 Rain gage A 5 | [45 [ | & 8 3 7 [35 = [ 2 % a 9 |20 | 12 | & ain gage c i 10km rain gage - ain gge 106m
Q2) For a total rainfall of 44 mm, distributed as shown in the table (3), establish the o index of the catchment area for a surface runoff of 19.5 mm. Table (3) Rainfall intensity versus time. Time Rainfall intensity (mm/hr) 1 4 21 3 9. 4 6. 4
Show full solution.According to rainfall data collected by a laboratory during storm events, the precipitation level in inches (X) varies jointly with runoff in cubic feet per second (Y). The joint probability mass function (PMF) of both variables are given by the following Table: Y 1 2 3 10 0.05 0.15 0 20 0.1 0.25 0.25 30 0 0.1 0.1 a. Determine and plot the marginal PMF of runoff.b. Determine the correlation coefficient between X and Y.
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.
The rainfall intensity for each 20 min period are given below for a storm. The direct runoff from the basin is 2.5cm 20 MINUTES RAINFALL RAINFALL 1 2.5 2 5 a) What is the total storm rain? cm b) What is the Phi Ø index for the basin? 3 6.5 _cm/hr 4 3.5 5 1
Runoff data have been collected for a 4-hour storm over a 120 acre watershed as indicated in the table. If the total volume of water infiltrated during the storm was 3.0 Ac-ft and the Phi Index is 0.1 in/hr, sketch the rainfall hyetograph with EVERYTHING labeled appropriately. Also, report the depth and volume of precipitation (in inches and Ac-ft, respectively) for each 1-hour period.
A direct runoff hydrograph due to an isolated storm with on effective rainfall of 3.6 cm was trapezoidal in shape as shown in figure. The hydrograph corresponds to a catchment area of : Discharge (cumes) 100 cumes - 6 hours 78 hours Time (hr)
02: Table below shows a rainfall data gathered from a storm occurred on a watershed area 2851 km² with direct runoff 856 m³/sec. Determine the W and index for this area and check the validity of your solution. Time (hrs) Rainfall 14.3 8.0 7.2 3.8 2.0 (mm) 1 2 3 4 5 6 7 8 1.3 1.0 0.0 9 0.8 10 11 12 13 0.0 13.9 17.2 2.0 14 15 0.9 1.5
PROBLEM 2: Based on the given RIDF data, the relationship of the rainfall intensity and the time can be described using the general equation A. Determine the design peak flow for a 25-year return period flood, for an urban catchment that has an area of 0.75 sq. km. The slope of the catchment is 0.006 and the maximum length of flow is 900 meters. Assume runoff coefficient of 0.40. GIVEN: Rainfall-Intensity-Duration-Frequency (RIDF) Data (25-year return period) Duration, mins Rainfall, mm Intensity, mm/hr 5 10 15 20 30 45 60 27.3 40.7 53.1 61.1 75.1 91.1 101.6 327.6 244.2 212.4 183.3 150.2 121.5 101.6 General Equation A: Where: a, b, &c are regression constants a = 1098.984 a i = (te + b)e b = 3.46 0.569
Q1: The following time distribution of the rainfall, estimate the -Index and W- Index of the rainfall if the surface runoff from this rainfall is (2 cm)? Time (hr) 2 3 4 5 Rainfall (cm) 1.2 1.5 0.9 0.6 1 0.5