A flownet constructed to determine the seepage through an earth dam which is homogeneous but anisotropic, gave four flow channels and sixteen equipotential drops. The coefficients of permeability in the horizontal and vertical directions are 4 x 10-^{7} m/s and 1.0 x 10^{-7} m/s, respectively. If the storage head was 20 m, then the seepage per unit length of the dam (in m^{3}/s) would be

While aligning a hill road with a ruling gradient of 1 in 20, horizontal curve of radius 80 m is encountered. The compensated gradient on the curve will be

The following steps are involved in arriving at a unit hydrograph. 1. Estimating the surface runoff in depth. 2. Estimating the surface runoff in volume. 3. Separation of base flow. 4. Dividing surface runoff ordinates by depth of runoff. The correct sequence of the steps is :