In Fig.10 static depression is plotted against distance from pipe inlet for the five combinations given.
It will be observed that, particularly after the elbows, irregularities occur in the pressure gradient in the earlier
part of the pipe. By the time pressure tapping No.8 is reached, however, the pressure gradient is substantially
uniform, and losses in the various combinations are compared on the basis of readings taken at this point,
with other results given in the first two columns of the table. The values for head loss, expressed as a
proportion of mean velocity head, are given in the third column.