Explanation

Pressure head (h) in meters is converted to pressure ($ ext{kN/m}^2$) using the formula $ ext{P} = ho g h$. Since $ ho g$ for water is approximately $9.81 ext{ kN/m}^3$, a 10 m head equals $10 imes 9.81 ext{ kN/m}^2$, which is close to 98.