A new report finds communities along the Charles River will experience an appreciable increase in flooding within the next 50 years.
Theis expected to continue: the more the earth warms, more rain is likely to fall in the Northeast, including in the Charles River watershed. And storms that were not so frequent are expected to happen more often.
Ghosh said that in the extreme case of 100-year storms occurring over 24 hours, the flood could reach three feet above the ground in low-lying areas. She also mentioned the drainage pipes are not large enough to drain that volume of water.Towns that are more urbanized, which means more concrete impervious surface that doesn’t absorb water, and that are located downstream are likely to be most affected.
“This [model] gives us that information to understand what areas are vulnerable to flooding both now and in the future, and how we can maybe preserve some of those natural areas which can and are providing natural flood storage.” Using different rainfall scenarios, the team tested the effectiveness of different mitigation approaches on flooding in the model. For example, when the engineers increased the size of existing wetlands by 20% using a 10-year storm in 2070 projection, the team was surprised to learn that this would only protect 29 acres — less than 1% — of land from flooding compared to a no-action scenario.
In Medway, one of the ideas for Oakland Park is to build a bioswale that would slow and filter runoff and before it drains it into an underground water storage.
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