Question 4:Determine the smallest base length b of the concrete gravity dam that will prevent the dam from overturning due to water pressure acting on the face of the dam. The density of concrete is pc = 2400 kg/m. Hint: Work the problem using a 1-m width of the dam. Please apply the same logic for the center of gravity as for the center of pressure (A=a+b; lxx,C=a. b/12). b 9 m