Question 4 A catchment is idealized as a 30km x 30km square. It has four rain gauges as shown in the Figure Q4. During a month, the precipitation at these gauges is measured as A=(300+X) mm, B=(285+X) mm, C=(272+X) mm and D=(290+X) mm. Compute the average precipitation (in mm, up to one decimal place) over the catchment during this month by using the Thiessen polygon method. A X=3 Figure Q4- Watershed boundary and rainfall gauges

Question 4 A catchment is idealized as a 30km x 30km square. It has four rain gauges as shown in the Figure Q4. During a month, the precipitation at these gauges is measured as A=(300+X) mm, B=(285+X) mm, C=(272+X) mm and D=(290+X) mm. Compute the average precipitation (in mm, up to one decimal place) over the catchment during this month by using the Thiessen polygon method. A X=3 Figure Q4- Watershed boundary and rainfall gauges

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 catchment with an area A = 85 km^2, has four rainfall gauges (P1 – P4) according to the figure. Use the rainfall data in the table to determine the areal rainfall over the catchment. a.Use the arithmetic averaging method to calculate areal rainfall. b.Use the Thiessen method to calculate areal rainfall.
Estimate the total excess/effective rainfall in mm for a 5% AEP storm. The temporal pattern distribution for a 45-min rainfall duration (5-min time step) for a South Australian catchment of 5.4 km2 is given below. 20 19.17 16.67 12.5 5 10 8.33 3.33 5 Consider: IL = 11.5 mm and CL = 1.7 mm/hr Total rainfall depth = 30.1 mm Plot the effective rainfall hyetograph of this Question in mm.
The total annual precipitation for a region is approximately normally distributed with a mean of 848 mm and a standard deviation of 124 mm. What is the probability of an annual precipitation greater than 500 mm but less than 700 mm? Answr = 0.1145
The annual rainfall at the rain-gauge stations with the catchment area of 10km are indicated below. Thiessen polygon measured are also shown in the table below. Stations Recorded rainfall(P1)(cm) Area of polygon(ai)(km2) A 8.8 570 B 7.6 920 C 10.8 720 D 9.2 620 E 13.8 520 F 10.4 550 G 8.5 400 H 10.5 650 I 11.2 500 J 9.5 350 K 7.8 520 L 5.2 250 M 5.6 350 1. Describe mean rainfall over the area using Thiessen polygon method and Compare Thiessen polygon method with arithmetic mean method.
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
Using Isohyetal Method, find average rainfall over a catchment. The data is : Isohyetes in cm- 10, 11, 12, 13, 14, 15, 16, 17. The area b/w isohyetes (km2)- 50, 80, 110, 89, 70, 62, 120, 70. The average precipitation in cm - 10.5, 11.5, 12.5, 13.5, 14.5 15.5, 16.5, 17.5.*
An experimental rectangular plot of 10 km 12 km has five rain gauge stations as shown in the figure. The storm rainfall and coordinates of the stations are given in the table. 1. Estimate the rainfall at station E. 2. Construct the Thiessen Polygon and compute for the areal precipitation.
HYDROLOGY COMPUTE THE AREAL RAINFALL OF THE GIVEN DRAINAGE BASIN USING: A) ARITHMETIC MEAN METHOD B) THIESSEN METHOD
find the following : 1- Average precipitation by Arithmetic mean method (in) = ? 2- Area-3 (km^2)= ? 3- Area-2 (km^2)= ? 4- Average precipitation by Thiessen method (in)= ?
Figure 2.2 shows a catchment with seven rain guage stations inside it and three stations outside. The rainfall recorded by each of these stations are indicated by the figure. Draw the figure to an enlarged scale and calculate the mean precipitation method by Thiessen-mean method.
B- The mass curve of rainfall in the storm of total duraƟon 300 minutes is given below. Draw the hyetograph of the storm at 60 minutes interval step and intensity in cm/hr.(Show by calculaƟons )
Following catchment area includes 20-years of annual rainfall data. If the catchment average rainfall is to be calculated in each year using the Thiessen Polygon method or the Isohyetal method, explain the method you select and reasons. Consider that the both are area-average methods and give reasonably similar answers when the rain gauge network is dense as shown in the figure.