Engineering Concepts for Bioretention Facilities - Rutgers ...

Rain Gardens in NJ?
• Gardens should be designed to capture 1.25” of
rain.
• Maximum water depth should range from 6 to
12”
• Size should be 3 to 10% of contributing
watershed (e.g., a 1,250 sq. ft. house footprint –
125 sq. ft. garden that has a maximum water
depth of 1 ft.)
• Install an underdrain system where soils are not
suitable for infiltration
• Double shredded hardwood mulch 4” thick