Surface Irrigation Systems

A furrow of length $L = 100\text{ m}$ receives constant inflow $Q_{in} = 2.0\text{ L/s}$ for $t = 60\text{ minutes}$ ($3600\text{ s}$, total inflow volume $2.0 \times 3600 = 7200\text{ L} = 7.2\text{ m}^3$). Surface storage in the furrow at cutoff is $V_s = 1.2\text{ m}^3$ and runoff loss is zero. The volume of water infiltrated into the soil profile $V_{inf} = 7.2 - 1.2$ in cubic meters ($\text{m}^3$) is: