Here is another summary of the flood mitigation work done by the City of Waukesha. This summary is from Chris Langemak of the City of Waukesha. FDR
The City was looked at several years ago by a consultant to address several of the areas around the City that were prone to flooding. There were 10 areas identified in the initial study as well as preliminary solutions along with budgetary numbers to act a guidance for the projects. For each area, the preliminary solutions are reanalyzed in greater details and the projects move into a design phase and ultimately construction.
In this area, two of the drainage basins were looked at, Areas 1 & 2 since they impact each other. A basic look at the areas is Area 1 is Rolling Ridge Dr from the bypass to University Dr and Area 2 is University Dr south of Pebble Valley Rd.
Water from the west side of the bypass comes across the highway near Woodridge Ln and travels the open channel to University. One of the primary problems is the culverts were undersized for all of this water. Water would fill the channel, jump back out onto the roadway, run down the roadway to University Dr and continue to the south into the Rolling Ridge South Subdivision.
Several years ago when the bypass was constructed and the first phase of Area 1&2 took place, a structure was installed to intercept excess water as it crossed the bypass near Woodridge Ln. This water was routed south out of the basin and into Meadowview Park where it is detained in a series of ponds and released into Pebble Creek. This helps reduce the excess flow coming from the west from getting to the open channel.
The studies also looked at the open channel along Rolling Ridge Dr and determined which ones were still undersized based on the restricted flow which is the basis of the current project.
The current project starts at Devonshire since that is where the consultants studies show it is needed. Looking at the existing systems, this is makes sense since this is downstream from Lancaster where another 48” sewer bring water from the south and west discharges next to the existing 48” culvert bring water from the open channel along Rolling Ride Dr. Currently these two 48” sewers are directing water to a single 42” culvert at Devonshire.
I hope that clears things up a little. If not, please feel to contact me.
Christopher Langemak, P.E.
Project Engineer
City of Waukesha
P: 262-524-3598
C: 262-349-6512
