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A practical approach to flood mitigation and community resilience

Mott MacDonald helped the Township of Denville tame flooding from the Rockaway River.

Opportunity

Normally a scenic waterway, the Rockaway River frequently overflows during major storms, and has caused extensive damage to residences and businesses in New Jersey’s Township of Denville.

Solution

The Township engaged MacDonald to review previous studies, evaluate potential flood depths, and undertake a detailed evaluation of alternatives including floodwalls, road elevation, bridge modifications, detention basins, a major bypass culvert, removal of abandoned bridge piers, stormwater pump stations, and sewer modifications.

Outcome

We provided the Township with prioritized recommendations and are helping implement the improvements on a phased basis, including pursuing grants.

We are also reviewing proposed construction in the floodplain and measures to reduce the impact of flooding and speed recovery after a flood, thus improving the resiliency of the community.

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