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8/3/2019 Maryland; Rain Garden Project Klinken Residence - City of Davidsonville
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8/3/2019 Maryland; Rain Garden Project Klinken Residence - City of Davidsonville
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Stormwater Management Issues
The stormwater from the highlighted roof area is creating significant run-off during heavyrain, even with the use of rain barrels that were installed to slow the rainwater discharge.
Rainwater needs to be directed away from the structure and kept from racing down a slope,
which runs east to west.
A solution would be to install a rain garden for the stormwater to collect and slowly percolateinto the ground. A secondary rain garden would serve as an overflow area for situations
where the primary rain garden could not handle the water volume. Currently, both areas arcovered with sparse grass and located in full sun.
A percolation test shows that the soil drains fairly quickly well within the tolerance of 24hours for a hole one foot wide and two feet deep.
Three downspouts from the roof area will drain into the rain garden. The calculations are
below:
38 18 684 21 12 252
14 13 182 24 12 288
14 14 196
14 14 196
total sq ft 1258 540
Rain Garden to Roof Ratio 43%
Roof Areas Rain Gardens
The Design
The design of the rain garden will be informal, with river stone and larger stones to hold the
soil berms and direct the water. The size of the primary rain garden will be approximately 2
x 12, with a depth of 6 to 12. The overflow area and future rain garden will beapproximately 24 x 12.
The planting material for the rain garden will be primarily native species that take full sunand are attractive to birds, butterflies, bees and beneficial insects, which will help control
pests in the organic garden adjacent to the rain garden.
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Location of P rimary Rain Garden
Location of Overflow Area
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8/3/2019 Maryland; Rain Garden Project Klinken Residence - City of Davidsonville
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Primary Rain Garden Area
Overflow Area
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8/3/2019 Maryland; Rain Garden Project Klinken Residence - City of Davidsonville
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Planting Design
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8/3/2019 Maryland; Rain Garden Project Klinken Residence - City of Davidsonville
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Chelone(Turtlehead)
Chelone ob l i qua
Chelone is comprised of a handful of perennials from NorthAmerica grown for their sturdy dispositions and white, pink, or
purple flowers that resemble turtle heads. The spikes of tubular,
2-lipped flowers bloom late in the summer to the middle ofautumn. Chelone work well in a damp border, bog garden, shade
garden, or at waterside. Blooms from late summer into fall.Weather resistant. Tolerates boggy soil. Turtleheads need part
shade or full sun and deep, moist, fertile soil, and can take heavier or boggy soil as well.
I r i s Vers ico lo r
Generally grows less than 2 feet tall, grows best at waters edge,but they can also grow in a perennial border with a little extra
attention to watering. All are hardy at least to Zone 5, and they
do best in rich, heavy, moisture-retentive soil. These species are
best established when planted in groups of three to five fans.Divide and transplant them in early spring or fall, keeping theroots moist.
Cal tha pa lus t r i s (Marsh m ar igo ld )Native to northern states and Canada, this little beauty is at home atpond's edge or along a stream. It is clumping by nature, but can seed into form a dense groundcover in a consistently moist site. In early springhundreds of bright yellow buttercup flowers dot the green carpet ofcordate foliage. Deer usually leave this alone! Found in marshes,swamps, and wet meadows from North Carolina to Alaska.Height: 10-12 Inches Spread: 12-18 Inches
USDA Hardiness Zone 3-7Caltha palustris likes moist conditions and rich soils. It is most at homenear a pond or stream, but can be happy in a low area that stays wetmost of the time. Marsh Marigolds do tolerate periods of drought, butwill go dormant, losing all their leaves.
Rudbeck ia f u lg ida (Black-eyed Susan)Large flowers consisting of brassy orange-yellow rays surrounding browncones are what make this plant so popular. It blooms for 7 or 8 weeksbeginning in midsummer. The flowers top 18- to 30-inch-tall plants that willreadily self sow in cultivated soils.They are suitable for mixed borders, meadows, native gardens, open woods,
and large annual displays.Grow in average, slightly heavy but well-drained soil in full sun to partialshade.
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