The actual discharge would be slightly in excess of this.

In addition to the circumstances already enumerated which
affect the accuracy of gaugings taken by means of a weir fixed
in a sewer there is also the fact that the sewage approaches
the weir with a velocity which varies considerably from time to
time. In order to make allowance for this, the head calculated
to produce the velocity must be added to the actual head. This
can be embodied in the formula, as, for example, Santo Crimp's
formula for discharge in cubic feet per minute, with H measured
in feet, is written

__________________
195\/(11^3 + .035V - H^2

instead of the usual form of
____
195\/ H^3, which is used

when there is no velocity to take into account. The V
represents the velocity in feet per second.

Triangular or V notches are usually formed so that the angle
between the two sides is 90 , when the breadth at any point
will always be twice the vertical height measured at the
centre. The discharge in this case varies as the square root of
the fifth power of the height instead of the third power as
with the rectangular notch. The reason for the alteration of
the power is that _approximately_ the discharge over a notch
with any given head varies as the cross-sectional area of the