SECTION B: ANSWER ONLY ONE (1) QUESTIONQ1.The average annual precipitation of Atweneboanda a village community in the WesternRegion of Ghana is 870 mm/yr. This sub-catchment with an area of about 24 km2 has anannual evaporation of 300 mm/yr and an infiltration rate of 200 mm/yr, assuming the basicconcept of the water balance;Calculate the runoff Q in m/s from within the sub-catchment.Industrial pollution arising from the establishment of the oil company within thecommunity over two decades resulted in an annual average precipitation of 1700mm/yr with a corresponding evaporation rate of 320 mm/yr. Urbanization alsoresulted in an increased runoff rate of 1.03m/s. Compute the infiltration rate of thesub-catchment in mm/yr. Explain the significance of your answer.Calculate the percentage change in perviousness of the catchment over the studiedperiodI.II.III.Q 2.The average annual rainfall is 800 mm/yr in a catchment of l100 km2. In its original conditionthe average annual total runoff is 1.1 m/s. In an average year, 50% of the rainfall infiltratesand 12.5% of the rainfall reaches groundwater. Tests have shown that the average annualevapotranspiration from the unsaturated zone is 340 mm/yr. Assume water balance over longtime period, compute the following3;i. How much water (mm/yr) reaches the root zone through capillary rise?ii. How much water seeps out from the groundwater to the surface water in an averageyear (mm/yr)?iii. How much water evaporates directly from interception in mm/yr?iv. How much is the total evapotranspiration (mm/yr) in the catchment in an averageyear?

Precipitation P=870 mm/yeararea A=24 km2Evaporation E=300 mm/yearinfilteration rate I=200…

SECTION B: ANSWER ONLY ONE (1) QUESTION Q1. The average annual precipitation of Atweneboanda a village community in the Western Region of Ghana is 870 mm/yr. This sub-catchment with an area of about 24 km2 has an annual evaporation of 300 mm/yr and an infiltration rate of 200 mm/yr, assuming the basic concept of the water balance; Calculate the runoff Q in m/s from within the sub-catchment. Industrial pollution arising from the establishment of the oil company within the community over two decades resulted in an annual average precipitation of 1700 mm/yr with a corresponding evaporation rate of 320 mm/yr. Urbanization also resulted in an increased runoff rate of 1.03m/s. Compute the infiltration rate of the sub-catchment in mm/yr. Explain the significance of your answer. I. II.

SECTION B: ANSWER ONLY ONE (1) QUESTION Q1. The average annual precipitation of Atweneboanda a village community in the Western Region of Ghana is 870 mm/yr. This sub-catchment with an area of about 24 km2 has an annual evaporation of 300 mm/yr and an infiltration rate of 200 mm/yr, assuming the basic concept of the water balance; Calculate the runoff Q in m/s from within the sub-catchment. Industrial pollution arising from the establishment of the oil company within the community over two decades resulted in an annual average precipitation of 1700 mm/yr with a corresponding evaporation rate of 320 mm/yr. Urbanization also resulted in an increased runoff rate of 1.03m/s. Compute the infiltration rate of the sub-catchment in mm/yr. Explain the significance of your answer. I. II.

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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In a given year, a watershed with an area of 2500 km'J received 130 cm of precipitation. The average rate of flow measured in a gage at the outlet of the watershed was 30 m3/sec. Estimate the water losses due to the combined effects of evaporation, transpiration, and infiltration due to ground water. How much runoff reached the river for the year (i n cm)?
A 6-hour rain of average intensity 2 cm/hour falls over the fern leaf type catchment as shown in Figurebelow. The time of concentration from the lines AA, BB, CC and DD are 1, 2, 3 and 4 hours,respectively, to the site 0 where the discharge measurements are made. The values of the runoffcoefficient C are 0.5, 0.6, and 0.7 for the 1st, 2nd and 3rd hours of rainfall respectively and attain aconstant value of 0.8 after 3 hours. Draw surface runoff hydrograph from the runoff collected from thecatchment and also calculate volume of direct Runoff.
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