The rest of this information is from an IU study except for the satellite images.
A 100-year flood is 7400 cfs. The design goal is to divert 80% of that flow or 6200 cfs. This will lower the creek height a little over 6' during a heavy storm.
Below is a satellite image of the diversion structure. The 12" pipes on 3' centers along the creek edge are to screen out objects such as tree limbs. Then, at the intake bay, is a 6" grate. "This keeps pedestrians or animals from falling into the structure." The diversion structure has three 12' x 12' sluice gates.
|IU, diversion structure during construction|