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Rain Gardens - PowerPoint PPT Presentation

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Rain Gardens Jason Winey Watershed Specialist Snyder County Conservation District Women-In-Ag 2009 Rain Gardens Definition What a Rain Garden is NOT. Benefits Design New Berlin Project Why Native Plants? My “Why not? Lecture” Rain Garden Definition

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Rain Gardens

Jason Winey

Watershed Specialist

Snyder County Conservation District

Women-In-Ag 2009

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Rain Gardens

  • Definition

  • What a Rain Garden is NOT.

  • Benefits

  • Design

  • New Berlin Project

  • Why Native Plants?

  • My “Why not? Lecture”

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Rain Garden Definition

  • A rain garden is a planted depression that allows rainwater runoff from impervious urban areas like roofs, driveways, walkways, and compacted lawn areas the opportunity to be absorbed. This reduces rain runoff by allowing stormwater to soak into the ground (as opposed to flowing into storm drains and surface waters which causes erosion, water pollution, flooding, and diminished groundwater). Rain gardens can cut down on the amount of pollution reaching creeks and streams by up to 30%.

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Rain Garden Myths

  • Rain gardens are not ponds or wetlands. It only holds water for 1-2 days after a rainfall event.

  • A Rain Garden is not a breeding ground for Mosquitoes, which need 7-10 days in standing water to reproduce.

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Filter runoff pollution

Recharge local groundwater

Conserve water

Improve water quality

Protect rivers and streams

Remove standing water in your yard

Reduce mosquito breeding

Survive drought seasons

Rain Garden Benefits(the fun part)

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Increase beneficial insects that eliminate pest insects

Reduce potential of home flooding

Create habitat for birds & butterflies

Reduce garden maintenance

Enhance sidewalk appeal

Increase garden enjoyment

Rain Garden Benefits(the fun part II)

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Rain Garden Design

  • Location

  • Soils

  • Plants

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Rain Garden Location

  • At the end of downspouts, but not too near your house.

  • Natural Swales

  • Where water collects

  • Edge of Parking Lots

  • Beside Sidewalks

  • Your Imagination

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Rain Garden LocationAt the end of downspouts, but not too near your house.

  • Divert Spoutings into Garden. Better yet divert your Rainbarrel overflow into garden.

  • Keep 10 ft from house

  • Make sure exit of garden is sloped away from house.

  • Remember Septic, Utility Lines, etc

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Rain Garden LocationNatural Swales

  • Use natural swales or contours to carry water to Garden.

  • Be careful to make sure you are not delivering too much water to your garden.

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Rain Garden LocationWhere Water Collects

  • Natural Wet Spots

  • Where water lays after a storm event.

  • Remember a Rain Garden is not a pond.

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Rain Garden LocationImpervious Surfaces

  • Sidewalk Borders

  • Parking Lot Borders

  • Your Imagination

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Rain Garden Soils

  • Perc Test?? Do we want that much work?

  • Amended Soil

  • Gravel Layer

  • Drains

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Rain Garden SoilsPerc Test: Do we want that much work?

  • Short Answer is NO…

  • If we want it to work we can make it work.

  • There are benefits in knowing the percolation rate, but we can work around slow rates.

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Rain Garden SoilsAmended Soil

  • Hundreds of Recipes, I like this one.

  • VA Dept of Forestry.

    25% Compost / Leaf Litter

    25% Topsoil

    50% Sand

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Rain Garden SoilsGravel Layer

  • Increases Infiltration Capacity

  • Creates Voids to Trap Sediments

  • The beginning of the “Why not? Lecture”

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Rain Garden SoilsDrains

  • Lets hope not.

  • May be needed if you are capturing to much water.

  • I would redesign before I would drain.

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Rain Garden PlantsToo many plants, not enough time

  • Plants must be tolerant of water and drought. Remember these aren’t ponds.

  • Use Native Plants.

  • Pick plants based on your design; butterflys, red-white-blue, etc.

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New Berlin Rain Garden Project

  • A project by the Lower Penns Creek Watershed Association (LPCWA)

  • Install Three Rain Gardens near Ballfields in New Berlin Commons

  • Targeting Three Erosion Problem Areas.

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Native Plants

  • More Adapted to Soils and conditions in PA.

  • Better Root structure to tolerate both dry and saturated conditions.

  • Will not spread and become a nuisance.

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The “Why Not? Lecture

  • Low Cost

  • Low Tech

  • Low Maintenance

  • High Environmental Impact

  • High Visual Appeal

  • Highly Reproducible in Many Settings

  • They’re “Pretty”

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My Disclaimer;

I am not an expert in horticulture, gardening, landscape design, well lets face it I am not an expert in anything.

I will try my best to answer any questions, but am not afraid to say “I have no idea”