Flooding
After heavy rainfalls, the Rockaway River causes flooding in the area of Denville that is north of the central business district, including residential areas along the river. During the massive flooding following Hurricane Irene in August 2011, the Rockaway River crested approx. 6 feet above its previous record flood level. The downtown Denville business district and surrounding residential areas were flooded, by in some places up to 8 feet of water. As silt has accumulated in the river basin, the average depth of the river has steadily decreased, leading to greater frequency of flooding events and more extensive flooding than ever before.
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