h1. \+Linear Flow Orifice Meter Sutro Weir Design Documentation\+
h2. \+*Mathcad Code*\+
the mathcad code can be found \[here\|^Sutro|LFOM weir design documentation^Sutro Weir solution.xmcd\]. You will need to have mathcad installed on your computer in order to open the file.
h2. \+*Documentation*\+
\*Note :\* The values used in this documentation are not static and do not correlate to actual design parameters.
h3. Inputs
Inputs are the data that must be entereed by the user in order to design the sutro wier for the specific application. The mathcad inputs are shown below
\!inputs.bmp\!
{latex} $$ Q_{max} $$ {latex}
= maximum flow through sutro wier, L/min
{latex} $$ H_{dmax} $$ {latex}
= the set height of the curved portion of the wier, cm
{latex} $$ C_d $$ {latex}
= proportionality constant, the average value is 0.62
{latex} $$ \Pi_{sutro} = {Q_{min} \over Q_{max}} $$ {latex}
= fraction of Qmax that is equal to Qmin, accounts for the fact that the linear region doesn't include the rectangular base
{latex} $$ \Pi_{Qratio} $$ {latex}
=
{latex} $$ \Pi_{sutro} $$ {latex}
= the use of two variables is just makes it easier to follow in the code.
h3. Linear Proportionality
\!linear proportionality.bmp\!
{latex} $$ C_{linear} $$ {latex}
= linear proportionality, L/min/cm
h3. Rectangular Base Width
\!rectangular base width.bmp\!
W = rectangular base width, cm
g = gravity, 9.8 m/s^2
h3. Rectangular Base Height
\
!rectangular base height.bmp\!
s = rectangualrrectangular base height, cm
h3. Profile of curved portion of weir
!profile of curved portion.bmp!
y = the profile of the curved portion of the weir, cm
x = corresponds to the the vertical height of weir from \-s to {latex} $$ H_{dmax} - {2 \over 3} s $$ {latex} , cm
h3. Y-axis of the graph
!y- axis of the graph.bmp!
{latex} $$ H_d $$ {latex} = this is the vairable that corresponds to the height of the entire weir from the bottom of the rectangular base to the top of the curved portion of the weir, cm
h3. Sutro Weir Graph: Illustrates the shape of the weir.
!sutro weir graph.bmp!
Y-axis = {latex} $$ H_d $$ {latex}
X-axis = y | 