difference between regular file and pipe file in unix
Unix file types These named pipes are special files that can exist anywhere in the file system. These named pipe special files are made with the command mkfifo as in mkfifo mypipe.
Depth–slope product The depthâ€“slope product is used to calculate the shear stress at the bed of an open channel containing fluid that is undergoing steady, uniform flow. It is widely used in river engineering, stream restoration, sedimentology, and fluvial geomorphology. It is the product of the water depth and the mean bed slope, along with the acceleration due to gravity and density of the fluid.