Using matlab please

Consider a river flowing toward a lake at an average of 3m/s at a rate ranging from 200 m^3/s to 500 m^3/s at a location 90 m above the lake surface. Determine the total mechanical energy of the river water per unit mass and the power generation potential of the entire river using while-loop when the volumetric flow rate is increasing by 100 m^3/s. Density of water is 1000kg/m^3.