Considering the unit hydrograph as a probability density function

In conclusion two parameter lognormal probability density function could be used as synthetic unit hydrograph and because of the higher Nash-Sutcliffe model efficiency coefficient values in 12 of 14 drainage basins for which two parameter lognormal probability density function could be used as synthetic unit hydrograph, the usability of two parameter lognormal probability density function as synthetic unit hydrograph is more powerful than the usability of two parameter gamma probability density function in most of drainage basins.