The relative velocities and discharges under the third test, using the
nomenclature of the first and correcting the lengths of pipe on account
of the removal of the 10-in. pipe near the reservoir, are:


48,000 + 12,700
----- --------- = 12,660
_x_ 2.56_x_

_x_ = 4.183

and 2.56_x_ = 10.708


and the discharges are:


From the 10-in. pipe = 5.840 cu. ft. per sec.
" " 16 " " = 5.839 " " " "


_Coefficients_.--On May 12th, 1909, the 10-in. line was working on a
grade of 0.03338, and, with _n_ = 0.009, _C_ should have been 131. It
was actually 138, making _n_ = 0.00866. The 16-in. line was working on a
grade of 0.0030625, and, with _n_ = 0.009, _C_ should have been 145. It
was actually 141, making _n_ = 0.0092.

Referring to the estimated hydraulic grade between Coyote and Corona
(Plate V), the coefficients, 0.01 and 0.012, were used for wood and
iron, respectively, on which basis, the maximum pressure at Coyote was