Miniature wetlands reduce stormwater
problems and create wildlife habitat
Ever watch your gutter’s downspout gush during a heavy rain?
The average Missouri roof sheds tens of thousands of gallons
of water a year.
Where does all the rainwater go? In urban
areas, roof runoff flows into the local stormwater system,
which often is...
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Miniature wetlands reduce stormwater problems and create wildlife habitat Ever watch your gutter’s downspout gush during a heavy rain? The average Missouri roof sheds tens of thousands of gallons of water a year. Where does all the rainwater go? In urban areas, roof runoff flows into the local stormwater system, which often is stressed already by road and parking lot runoff. You can ease the stress by channeling your roof’s runoff into a rain garden, which is a miniature wetland. If you’ve been to a natural Missouri wetland, such as Lowry Marsh Natural Area in Mercer County near Princeton, you know that wetlands are beautiful, moist landscapes rich with native wildflowers, grasses, birds, reptiles and dragonflies. Aside from providing beauty and natural diversity, wetlands perform a vital landscape function. Their densely rooted native plants capture, filter, store and slowly release stormwater. Wetlands also trap and use nutrients such as nitrates and phosphates that otherwise w
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The Vermont Rain Garden Manual
“Gardening to Absorb the Storm”
Winooski
Natural Resources
Conservation District
Helping to protect and restore Vermont’s rivers and lakes.
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© Earth Partnership for Schools•University of Wisconsin–Madison Arboretum Perform Site Analysis 2-3
Background
Determining the soil type for your proposed rain garden is an important
factor for calculating its size.
Two other factors needed to size a garden are
drainage area and percent slope.
Together these three factors give...
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© Earth Partnership for Schools•University of Wisconsin–Madison Arboretum Perform Site Analysis 2-3 Background Determining the soil type for your proposed rain garden is an important factor for calculating its size. Two other factors needed to size a garden are drainage area and percent slope. Together these three factors give you the square footage needed to collect and infiltrate 100% of the rain water that falls in the drainage area. The type of soil influences the size and depth of the garden area. If the soil is sandy, rain gardens can be smaller and deeper because water drains quickly. If the soil has more clay, the garden will need to be larger and shallower because water drains more slowly. It is important to allow water to drain quickly so that mosquitoes will not complete their life cycle from egg to insect. Determining soil type, drainage area and slope will ensure that water will soak into the garden within 6 to 12 hours. There are several methods to identify the ty
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earth-wise guide to
Rain Gardens
What is a
rain garden?
A rain garden is a shallow, vegetated
depression designed to absorb and
filter runoff from hard (impervious)
surfaces like roofs, sidewalks, and
driveways.
Rain gardens are usually
planted with colorful native plants
and grasses.
They not only provide
an attractive addition to...
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earth-wise guide to Rain Gardens What is a rain garden? A rain garden is a shallow, vegetated depression designed to absorb and filter runoff from hard (impervious) surfaces like roofs, sidewalks, and driveways. Rain gardens are usually planted with colorful native plants and grasses. They not only provide an attractive addition to the yard, but also help to conserve water and protect our water quality. How does a rain garden help? As Austin becomes increasingly urbanized, native landscapes are replaced with impervious surfaces that prevent rainwater from soaking into the ground. Stormwater quickly runs off these hard surfaces, picking up any pollutants from the land and carrying them to our creeks. This rapidly flowing water also increases the chances of flooding and erosion. The goal of a rain garden is to keep water on the land. Rain gardens, with their shallow depressions, capture stormwater and provide for natural infiltration into the soil. This provides water for the plants
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10 feet wide;
full to partial
shade with clay
soils
Total Area:
70 sq.
ft.
Symbol Scientific Name Common Name Number
of plants
Ac Acorus calamus Sweet flag 5
Cp Caltha palustris Marsh marigold 7
Ca Campanuta americana Tall bellflower 6
Cxg Carex grayii Bur sedge 7
Cxl Carex lupulina Hop sedge 3
Iv Iris versicolor Blue flag 13
Lc...
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10 feet wide; full to partial shade with clay soils Total Area: 70 sq. ft. Symbol Scientific Name Common Name Number of plants Ac Acorus calamus Sweet flag 5 Cp Caltha palustris Marsh marigold 7 Ca Campanuta americana Tall bellflower 6 Cxg Carex grayii Bur sedge 7 Cxl Carex lupulina Hop sedge 3 Iv Iris versicolor Blue flag 13 Lc Lobelia cardinalis Cardinal flower 7 Mv Mertensia virginica Virginia bluebells 25 Os Onoclea sensibilis Sensitive fern 2 Total Plants Needed: 70 20 feet wide; full to partial shade with clay soils Symbol Scientific Name Common Name Number of plants Ac Acorus calamus Sweet flag 16 Cp Caltha palustris Marsh marigold 5 Ca Campanuta americana Tall bellflower 9 Cxg Carex grayii Bur sedge 9 Cxl Carex lupulina Hop sedge 15 Iv Iris versicolor Blue flag 121 Lc Lobelia cardinalis Cardinal flower 15 Mv Mertensia virginica Virginia bluebells 25 Os Onoclea sensibilis Sensitive fern 25 Total Plants Needed: 140 25
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Start-to-Finish
Rain Garden Design
A Workbook for Homeowners
Your Contact Information
Name __________________________________________________
Phone or E-mail _______________________________________
Address ________________________________________________
_________________________________________________________...
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Start-to-Finish Rain Garden Design A Workbook for Homeowners Your Contact Information Name __________________________________________________ Phone or E-mail _______________________________________ Address ________________________________________________ _________________________________________________________ _________________________________________________________
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Detailed design guidelines can be found in the Design
Guidelines 2005 report, available at www.
gvrd.
bc.
ca
Goya Ngan
Landscape Architect
DESIGN PRINCIPLES
■ Literature suggests rain garden areas
of about 10-20% of upstream
impervious area.
For GVRD, calculate
rain garden area by continuous flow
modelling.
Optimum rain garden...
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Detailed design guidelines can be found in the Design Guidelines 2005 report, available at www. gvrd. bc. ca Goya Ngan Landscape Architect DESIGN PRINCIPLES ■ Literature suggests rain garden areas of about 10-20% of upstream impervious area. For GVRD, calculate rain garden area by continuous flow modelling. Optimum rain garden size is about 50sq. m. draining 250sq. m. of impervious area. ■ Smaller, distributed rain gardens are better than single large scale facilities. ■ Locate rain gardens a minimum 30. 5m from wells, 3m downslope of building foundations, and only in areas where foundations have footing drains and are not above steep slopes. ■ Provide pretreatment and erosion control i. e. grass filter strip to avoid introducing sediment into the garden. ■ At point-source inlets, install non-erodable material, sediment cleanout basins, and weir flow spreaders. ■ Bottom width - 600mm (Min. ) to 3000mm (desirable). Length-width ratio of 2:1. ■ Side slopes - 2:1 maximum, 4:1
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City of Rock Island
RAIN GARDENS FOR ROCK ISLAND
Improving the Environment, One Garden at a Time
City of Rock Island
Rain Garden Facts:
· Rain gardens reduce flooding,
absorb pollutants, and sustain
wildlife.
· Rain gardens come in a number
of shapes and do not require
much space.
· A typical rain garden is only four
to eight...
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City of Rock Island RAIN GARDENS FOR ROCK ISLAND Improving the Environment, One Garden at a Time City of Rock Island Rain Garden Facts: · Rain gardens reduce flooding, absorb pollutants, and sustain wildlife. · Rain gardens come in a number of shapes and do not require much space. · A typical rain garden is only four to eight inches deep. · Many different types of perennials can be used but native plants are typically the better choice. · Before you dig, call JULIE at 1-800-892-0123. · The City will reimburse citizens based on the total square footage of the rain garden at the rate of $4. 00 per square foot. · If you are able to incorporate the use of a rain barrel into your rain garden, the City will supply one free of charge. City of Rock Island Public Works Department 1309 Mill Street Rock Island, IL 61201 309-732-2200 www. rigov. org What is a Rain Garden? Rain gardens are shallow depressions planted with perennial plants that are located near a downspout or an area that she
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A PROGRAM
OF
NORTH CAROLINA COOPERATIVE EXTENSION
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