Alternative Crossed Path Configuration In Open Channels; Surcharged Mode - Accusonic 8510+ series Reference Manual

3-4 Accusonic Model 8510+ Series Flowmeter
where: Area
The flows in all the intermediate panels is computed similarly.
The flow in the uppermost panel bounded by the surface is:
Q = Area
Top Top
where: Area
and the water surface.
If the difference in elevation between the water surface and the uppermost good path is less than the
difference in elevations between the uppermost and next lower good paths, then:
Vel
Surface
If the difference in elevation between the water surface and the uppermost good path is greater than the
difference in elevations between the uppermost and next lower good paths, then:
Vel
Surface
The total Flow in the conduit is the sum of the flows in all the panels.
Flow = Flow scaling  (Q

Alternative Crossed Path Configuration in Open Channels

When crossed paths are installed, the flowmeter may be configured as two separate sections having
identical geometry and the same level inputs. Section #1 is configured for the paths in one plane, and
section #2 for those in the other plane. The Flow Scaling parameter is set to 0.5, and the channel flow is
the sum of the section flows.
Analog outputs should be allocated to section #1 to give Level, temperature and velocity, and to SF (Sum
of Flows) for Flow.

Surcharged Mode

A choice of two possible integration methods is available: Pipe and Surcharged Trapezoidal.
Surcharged Pipe Integration
See description on page 3-5 for Pipe Mode.
= conduit area between good path A and the next good path B
Int
Vel = water velocity as computed from the next good path or pair of crossed paths
B
 (Vel + Top Weight  Vel
N
= conduit area between the uppermost good path (or pair of crossed paths)
Top
Vel = water velocity computed from the uppermost good path or pair of crossed
N
paths
Vel = an estimated water velocity at the surface from a limited algebraic
Surface
extrapolation of the velocities from the uppermost good path (or pair of
crossed paths) and the next good path (or pair of crossed paths) below it.
= Vel + (Vel - Vel
N N M
where Elevation and Elevation
N
the next lower good path.
and Vel and Vel are the water velocities from the uppermost good path (or pair of
N M
crossed paths) and of the next lower good path (or pair of crossed paths)
= Vel + (Vel - Vel
N N M
Bottom
) / (1 + Top Weight)
Surface
)  (Level - Elevation
) / (Elevation
N
are the elevations of the uppermost good path and of
M
)
+  Q
+ Q )
Int Top
- Elevation )
N M