Chapter 19, Problem 19.4.1P

2.3 List six type of cofferdams and discuss briefly under which conditions you would recommend each type of cofferdam during construction. 2.4 Why is it necessary to integrate the design of the temporary access roads (to be used during construction) and the equipment selection process for roads during the dam?

68.Which of the following statements regarding floods is true ? Select one a. a 40 - year flood is generally of greater magnitude than a 80 - year flood b. a 200 - year flood has a 2 % chance of occurring in any one year c. if there is a 10 % probability of a flood of a certain height occurring in any one year it is called a 10 - year flood d . the recurrence interval of a flood of a certain height does not depell upon the width of the floodplain

Different steps of watershed modeling are provided in the options below. Select the option that is related to the last steps of the watershed modeling. O Evaluation and refinement of study objectives Sensitivity analysis, and usefulness evaluation Model selection, and input data gathering O Method selection, and model calibration

What are the types of dams, define each one with its figure

2. In an effort to control the destructive power of water during extreme conditions, a planned flood discharge with a certain return period is required as input for water structure design data. Explain what is meant by return period and how to determine the design flood discharge using a number of maximum daily discharge data?

Design magnitudes of floods are needed for the design of spillways, reservoirs, bridge openings, drainage of cities and air ports, and construction of flood walls and levees (flood banks). The maximum flood that any structure can safely pass is called the ‘design flood’. The damages due to the devastating floods can be minimized by the following flood control measures, singly or in combination. Comment on how to use a reservoir to control floods ? state two possible examples

Water resources engineering In A coffer dam is designed for a 25 year flood and constructed If it takes 5 years to complete the construction of the main dam, what is the risk that the coffer dam may fail before the end of the construction period? What return period in the design of coffer dam would have reduced the risk to 10%?

A small watershed has four rainfall gages located in the figure below. Total rainfallrecorded at each gage during a storm event is listed in the table. Compute the mean areal rainfallfor this storm using (a) arithmetic averaging and (b) the Thiessen method.

A potential site for a reservoir is being evaluated for two mutually exclusive options: a small water supply reservoir or a large flood control reservoir. Cost and benefit data on the two options are provided below. Interest rate to be used is 10%. Each alternative has an initial cost, an annual operating cost, and an annual benefit. Each alternative also has a mid-life maintenance cost that occurs 20 years after the start of the project. Alternative 1 (Water Supply ($ Alternative 2 (Flood Control ($ million)) million)) Initial cost 52 71 Annual operating cost 0.6 0.4 Annual benefit 10 11 Maintenance cost in year 2 20 Lifetime (years) 44 44 Compute PWNB of Alternative 1 and 2 precision guide: [0.000, 0.000] ] • answer Compute EUANB of Alternative 1 and 2 precision guide: [0.000, 0.000] answer What is the best option using PWNB and EUANB precision guide: [integer, integer] ]] • answer