W is 283 m. Assume a density of 2497 kg m- for the concrete that will be used to construct the dam. The density of water is 1000 kg m-3, and the gravitational constant g is equal to 9.81 ms. The dam has to retain a water level H of 55 m. The coefficient of friction is 0.7. For recreational purposes, the top length L of the dam has to be 2.1 m. Calculate the minimum value of T and the corresponding value of z to prevent the water pressure from making the dam slide. Write down all your workings. T Figure 2: The dam to perform the calculations for.