A diversion structure allows the inflow hydrograph to be
split into two separate components, the outflow hydrograph and the
diverted flow hydrograph.
Below a user-specified threshold flow all of the inflow will
be transmitted to the outflow hydrograph. When the inflow exceeds
the threshold value, the excess is divided in proportion to a
specified fraction. For example, if the inflow is 25 cfs and the
thresh-hold is 5 cfs so the excess flow is 20 cfs. Now if the
fraction is F = 0.8 this means that 80% of the excess flow is diverted
and the diverted flow will be 16 cfs and the outflow will be 9 cfs.
Instead of specifying the diverted fraction F you can define this
implicitly by specifying the desired peak outflow. MIDUSS will
then work out the necessary fraction to be diverted.
The diverted flow hydrograph is written to a file so that it
may be recovered at a later time and used to design the necessary
conduit or channel.
Use of the diversion command is the only instance in which the
topology of the network changes from a tree to a circuited
There is more diversion information in our FAQ section.