Case I:Power =\\dfrac{\\Delta K.E}{t} =\\dfrac{\\dfrac{1}{2}mv^{2}}{t}=\\dfrac{1}{2}dA.v^{3} where d is density A is area and v is velocity of waterCase II: P=\\dfrac{1}{2}\ imes dA.v^{3} When water delivered is n- times velocity will become n times i.e. P will become n^{3} times