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Sizing Your Rain Garden

Once you have determined the total impermeable drainage area for your rain garden, use the following chart to determine possible rain garden dimensions. Dimensions are given for ponding depths of 6 inches and 3 inches.

Impermeable Surface Area	Required Size of Rain Garden (6” deep)	Potential Rain Garden Dimensions (ftXft)	Required Size of Rain Garden (3” deep)	Potential Rain Garden Dimensions (ftXft)
800 ft 2	40 ft 2	4X10, 5X8, 6X7	80 ft 2	7X12, 8X10, 9X9
1000 ft 2	50 ft 2	5X10, 6X8	100 ft 2	7x15, 10X10
1200 ft 2	60 ft 2	4X15, 5X12, 6X10, 8X8	120 ft 2	10X12, 8X15
1400 ft 2	70 ft 2	5X14, 7X10	140 ft 2	10X14, 7X20
1600 ft 2	80 ft 2	7X12, 8X10, 9X9	160 ft 2	8X20, 10X16
1800 ft 2	90 ft 2	6X15, 7X13, 8X12, 9X10	180 ft 2	9X20,10X18,12X15
2000 ft 2	100 ft 2	7x15, 10X10	200 ft 2	10X20, 14X15
2500 ft 2	125 ft 2	8X16,10X13	250 ft 2	10X25, 13X20, 15X17
3000 ft 2	150 ft 2	10X15, 12X13	300 ft 2	10X30, 15X20
3500 ft 2	175 ft 2	9X20, 12X15	350 ft 2	14X25, 18X20
4000 ft 2	200 ft 2	10X20, 14X15	400 ft 2	16X25, 20X20
5000 ft 2	250 ft 2	10X25, 13X20, 15X17	500 ft 2	20X25

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