2.9 There are 10 raingauge stations available to calculate the rainfall characteristics of acatchment whose shape can be approximately described by straight lines joining thefollowing coordinates (distances in kilometres):(30, 0), (80, 10), (110, 30), (140, 90), (130, 115), (40, 110), (15, 60). Coordinates ofthe raingauge stations and the annual rainfall recorded in them in the year 2001 aregiven below.Station12345Co-ordinates(0, 40)(50, 0) (140, 30) (140, 80) (90, 140)Annual Rainfall (cm)132136938185Station78910Co-ordinates(0, 80)(40, 50)(90, 30)(90, 90)(40, 80)Annual Rainfall (cm)124156128102128Determine the average annual rainfall over the catchment by using isohyetals.

A rain gauge is a device used by meteorologists and hydrologists to collect and measure the amount…

Answered: 2.9 There are 10 raingauge stations…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Using the following values, give the water budget equation for this lake, and solve for annual groundwater flow. There are no other components. Period of time: Calander Year.Lake volume at beginning of year: 10,000. m^3Lake volume at end of year: 9,000. m^3Stream inflow: 700. m^3/month ET: 54.0 m^3/monthGW flow: unknown Give appropriate sig figs and show work Budget Equation: Inflows = Outflows + Change in Storage
4. A 60 mi² drainage area has the following characteristics: longest flow path length of 10 mi, flow path length from outlet to centroid of 3.2 mi, overland slope of 0.05, curve number of 82, basin coefficient of 1.35, and storage coefficient of 0.6. a. Derive a 1-hr: i. Snyder UH ii. SCS triangular UH. b. Plot the resulting hydrographs (together on one plot) and comment on the differences in peak discharge, peak timing, hydrograph shape, and volume between the two.
There are five rainfall gauges on a square plot of land of dimensions 2km x 2km. One of the gauges is located in the centre of the plot. Determine the position of the other four rainfall gauges such that the areal rainfall estimated using the Thiessen Polygon method is exactly equal to the estimate using the arithmetic method. Show how you found the positions.
A watershed has a system of three rainfall gauges as shown on the map below. The total storm rainfall depths is: A = 74 mm, B = 67 mm and C = 82 mm. Determine the spatial average rainfall for the network of rainfall gauges using Arithmetic Average and Thiessen Polygon methods. LOkm
Q3: In a catchment area, approximated by a rectangular of coordinates (50, 0), (100, 50), (50, 100), and (0, 50) km, four rainfall stations are situated inside the catchment. The coordinates of the stations and the annual precipitation recorded by the four stations in 2020 are given in Table below. Determine the average annual precipitation on the catchment using Thiessen-polygon method. Station Coordinate Precipitation (cm) 1 (50, 75) 85 2 (75, 50) 135 3 (50, 25) 95 4 (25, 50) 140
2. A catchment area has a rectangular shape with the following coordinates: (10,10), (10,50), (90,50) and (90,10). The coordinates of SIX rain gages and their average annual precipitations are given below. Find the average precipitation by using a.) Arithmetic Mean Method b.) Thiessen Polygon Method. Sta. No. 3 4 5 6 Coord. (10,10) (30,30) (10,50) (60,50) (80,30) (60,10) Prec. 110 100 100 95 85 105 (mm.)
How would you go about deriving a UH from a catchment for which data (catchment area, rainfall and discharge values) are available? Derive a hyetograph from the incident rainfall (losses do not need to be considered to derive a UH); Determine the UH using the formula "Ui = Qi/P" (for a single interval hyetograph) or using "deconvolution" (for a multiple interval hyetograph). Estimate direct runoff hydrograph by subtracting baseflow from observed stream flow data; Estimate the total runoff volume and the direct runoff depth over the catchment; Determine the UH ordinates using the formula "Unit hydrograph = Direct runoff hydrograph x 1/Direct runoff depth"; Estimate catchment losses and subtract these from the incident precipitation to obtain excess rainfall; the duration of the excess rainfall is used as the duration of the UH. Determine the precipitation volume for each time interval; Use UH superposition and proportionality principles to derive a direct unit hydrograph; Estimate…
Station Rainfall (mm) Annual (mm) ДХ (m) ΔΥ (m) Area (m²) A 42 500 10 25 1500 30 480 15 30 2000 50 558 24 30 830 526 500 E 35 590 40 19 1200 Using a rainfall of 386 mm for rain gauge Station D, determine the average depth of rainfall that fell for the watershed using the arithmetic average, and Thiessen polygon method. The areas for the Thiessen polygon method are given in the table above for each station. B.
Using a rainfall of 386 mm for rain gauge Station D, determine the average depth of rainfall that fell for the watershed using the arithmetic average, and Thiessen polygon method. The areas for the Thiessen polygon method are given in the table above for each station. Determine the average depth of rainfall for a watershed using the isohyetal method given the data below. Isohyet (mm) Area Associated (km²) 30 - 40 20 20 - 30 45 10 - 20 35 under 10
a) Briefly list the steps in deriving a unit hydrograph using the measured wadi-flow and the gross rainfall. b) An approximate boundary of a watershed and the river network are shown in the following figure. A set of contour lines drawn based on elevation data is also given on the same figure. If the catchment averaged curve number is ( the 2-hr SCS-triangular unit hydrograph. 71.6125 - ), calculate the peak-flow (in cfs) of 600 m 550 m 500 m River Catchment boundary ----- Contours 450 m 400 m 2 4 6 km

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