An engineer designs a cylindrical water tank with a hemispherical top. The cylindrical portion has radius $r$ meters and height $h$ meters. The total volume is constrained to be 100 cubic meters. The surface area (lateral side of cylinder + hemispherical top, excluding the bottom) must be minimized. If the optimal radius is approximately $r_0$ meters, which expression represents the optimal height $h_0$ in terms of $r_0$?