Water is designed to flow in a 1.5 m width rectangular irrigation channel at a velocity of 0.8 m/s and depth of 0.50 m. To measure the low of irrigation water along the channel, a sharp-crested rectangular weir with a discharge coeffielent of 1.95 is to be installed across the canal. Negleeting the eflct of approach velocity and assuming a negligible channel slope, determine the maximum height of a sharp-crested rectangular weir that must be installed so that the water depth upstream ol the weir will not exceed 1.20 m