Conclusions

The goal of this project was to model the flow conditions of the Oconto River for the 1-, 10-, 25-, 50-, 100-, and 200-yr storms in order to observe the flooding dangers that have been reported. In addition to this, channel modifications were investigated to determine the effects of widening and deepening the channel.

 

As was detailed within the results section, the Oconto River is very prone to flooding for storm events more severe than a 1-yr baseline storm. Increases in water surface elevations substantially increased following this baseline, and each subsequent storm condition, though gradual in change, thereafter, were still extreme in comparison to the tested residential elevations.

 

Much of this flood potential was likely caused by backwater effects, as was visually observed within the water surface profiles. The channel cuts were able to mitigate these effects somewhat, experiencing reductions in all tested parameters for each storm condition. Despite this, the modifications conducted within this study were extreme and ideal. Due to this, they are not feasible as a singular solution. It is still recommended the channel be widened and deepened to some extent, but more feasible alternative and supplementary solutions should be considered. 

 

Recommended Alternatives

Channel Diversion 

Backwater effects are known to be caused by high upstream flow rates with stagnant water bodies downstream. A channel diversion presents an opportunity to reduce incoming flow rates to the green bay outlet by splitting them upstream.

Widen the Floodplain

Widening the floodplain would allow for heavier storm surges to be better handled within the Oconto river system. The only problem with increasing the floodplain is the Oconto river flows through many residential areas and towns, and it could result in relocation of residents and their homes. As a result, it is recommended that other alternatives still be considered. 

Create Your Own Website With Webador