Urban Rain Gardens: The Ultimate Eco-Friendly Solution For City Dwellers

Rain gardens are an efficient and aesthetically pleasing way to manage stormwater runoff. And for those of you looking to create urban rain gardens, you’re in luck.

Urban rain gardens are convenient and eco-friendly because they can be created in a variety of sizes and shapes, making them a great option for small spaces in cities.

So, what exactly are rain gardens?

Well, rain gardens are a shallow depression in the ground that have the goal of capturing and then filtering rainwater from roofs, driveways, and other hard surfaces.

This allows it to slowly percolate into the ground instead of flooding into storm drains and local waterways.

The good news is that you can create a beautiful and functional rain garden in even the smallest of spaces with the right design and construction.

In this article, I will explore the benefits of urban rain gardens, the key considerations for designing and constructing a small space rain garden, tips for planting and maintaining your rain garden, and more!

Urban Rain Gardens: Key Takeaways

• Rain gardens are an eco-friendly way to manage stormwater runoff.
• Small space rain gardens can be beautiful and functional.
• The ticket to creating a successful rain garden is proper design, construction and maintenance.

All ready to explore rain gardens? Let’s go…

Table of Contents

What are the Benefits of Urban Rain Gardens?

Let’s start by examining some of the benefits of urban rain gardens:

• They can help to improve water quality by filtering out pollutants and contaminants.
• They can reduce erosion and urban flooding by slowing down the flow of stormwater. 
• Rain gardens allow water to permeate the ground, so soil absorbs water which is good for plants in need of hydration.
• Rain gardens can increase your property value by making your home more aesthetically pleasing.

As you can see, city rain gardens have quite a few benefits. They’re also very much on the agenda of many cities, due to growing concerns about climate change.

But, progress is painfully slow, as reported in this 2020 ScienceDirect paper.

By learning about how to build and maintain your own rain garden, you can do you bit to live a more eco-friendly life and become more self-sufficient along the way.

Getting Started with Urban Rain Gardens

Now we’ve looked at some of the advantages of urban rain gardens, let’s think about how you can take the first step towards establishing your own.

If you’re living in a small space, you may question whether it’s possible to build a rain garden. Luckily, it’s very possible as you’ll find out if you keep reading!

Many people want to use rainwater for household tasks, such as watering their plants. This is where rain gardens can be useful because if you choose the best rain garden plants you can ensure they always have a supply of rainwater to stay hydrated.

So, let’s take a closer look at the steps you need to take to get started with your rain garden.

1. Choose Your Site

To create an urban rain garden, you’ll first need to choose a location that is at least ten feet away from your home’s foundation and any septic systems.

You’ll also want to to pinpoint an area that is low-lying and receives a lot of runoff from your roof or other hard surfaces

The area should be slightly depressed and sloped so that water can flow into it naturally. You’ll also need to choose plants that are well-suited to wet conditions.

2. Keep your Design Space-Efficient!

In small spaces, optimal use of your outdoor area is key to a successful rain garden

Consider using a curved or meandering shape for your rain garden to maximise the amount of planting space. Your rain garden should be at least six inches deep and have a slope of roughly no more than 10%.

You can also create a tiered rain garden design with different levels of soil depth to accommodate a wider variety of plants.

Another space-saving technique is to use permeable pavers or gravel around the perimetre of the rain garden instead of traditional lawn or garden edging. This will save space and help with drainage.

You’ll also need to choose a soil mix that is well-draining and can support the growth of your plants.

The video below can help give you useful tips and tricks into building a rain garden in an urban area.

3. Choosing Plants for Small Spaces

When selecting plants for an urban rain garden, you should choose species that are compact and have a narrow profile. This will allow you to fit more plants into the available space without overcrowding.

You can consider native plants that are adapted to your local climate and able to tolerate both wet and dry conditions.

Some great plant choices for small rain gardens include:

• Dwarf varieties of shrubs and trees.
• Ornamental grasses.
• Wildflowers.
• Succulents and cacti.

Construction of Urban Rain Gardens

Now, let’s get into the details of constructing your urban rain garden.

1. Prepare your Soil

It is important to prepare the soil properly before building your urban rain garden. The soil should be well-draining and have good organic matter content.

To improve the soil structure, add compost or other organic matter to the soil. This will help the soil retain moisture while also improving drainage.

2. Drainage and Irrigation

Proper drainage and irrigation are essential for the success of a small rain garden.

The garden should be designed to drain within four hours of a one-inch rainfall to protect the health of the plants while absorbing the water.

To achieve this, you can use drainage materials at the bottom of the garden bed, such as gravel. This will help excess water to drain away quickly.

It’s also important to irrigate the garden regularly to ensure that the plants are receiving enough water.

3. The Raised Beds Option

Raised beds are a good option to create a small space rain garden. Raised beds can be constructed using a variety of materials, including wood, stone, or brick.

Remember to line the bottom of the raised bed with a permeable landscape fabric to prevent soil erosion and to allow for proper drainage.

For more information on raised beds, you can check out blogger Fiona Anderson’s article on building a vertical garden without spending too much money.

There are lots of great tips in there about how to prepare soil and build your garden’s foundation, all on a budget!

Urban Rain Gardens: Planting and Maintenance

1. Planting Techniques

So, you’ve prepared your depression and chosen your plants. Your soil is well-drained.

Now it’s time to plant your urban rain garden.

Start by planting the larger plants first, placing them towards the back of the garden. Then, fill in the remaining space with smaller plants and ground covers.

2. Ongoing Care and Management

Maintenance of a small space rain garden is relatively simple and shouldn’t take too much time.

Keep the garden free of debris, such as fallen leaves and twigs, as this can clog the drainage system. Regular weeding is also necessary to prevent the garden from becoming overgrown.

During drought conditions, it may be necessary to water the garden to ensure that the plants remain healthy, although avoid overwatering during ‘normal’ weather periods.

Also, remember to monitor the health of the plants in the rain garden. If any plants appear to be struggling, it may be necessary to adjust the location of the garden or to replace the plants with species that are better suited to the conditions.

Urban Rain Gardens Wildlife

Rain gardens are not only beneficial for managing stormwater and keeping plants nourished – they also create habitats for wildlife.

By selecting the right plants and providing suitable conditions, you can attract beneficial wildlife to your rain garden.

If you’re in the city, you’re not going to appeal to as many exciting species in comparison to rural areas.

But, with a bit of effort, you can attract some species as long a you provide a diverse range of habitats that cater to their needs.

1. Birds, bees and butterflies

For example, birds are attracted to rain gardens that have a variety of native plants, shrubs, and trees.

You can also add bird feeders and birdhouses to provide food and shelter. Bees and butterflies are attracted to flowers that produce nectar and pollen, such as black-eyed Susan, butterfly weed, and purple coneflower.

By including these plants in your rain garden, you can create a habitat that supports pollinators, even if you are in a city!

2. Amphibians

Another thing you can do is to create a shallow pool in your rain garden to provide a habitat for frogs, toads, and other amphibians.

You can also add logs and rocks to provide shelter for amphibians in your rain garden.

Just remember to avoid using pesticides and herbicides in your rain garden, as these chemicals can harm wildlife.

Instead, you can use natural methods such as companion planting and crop rotation to control pests and diseases.

By providing suitable conditions and maintaining habitat diversity, you can create a rain garden that supports a diverse range of wildlife.

Not only will this enhance the beauty of your garden, but it will also help to create a healthy and sustainable ecosystem.

Urban Rain Gardens: Overcoming Challenges

Rain gardens don’t come without challenges. Here are a couple of the main ones:

1. Managing Overflow

One key challenge of small space rain gardens is managing overflow during heavy rain. If the rain garden is not designed properly, it can overflow and cause flooding in the surrounding area.

To overcome this, it’s important to design the rain garden with an overflow system that can handle large amounts of water.

This can be tricky in urban areas, so you need to be realistic with the space you have so you can effectively manage your rain garden.

One way is to design the rain garden with a series of terraces or steps that can slow down the flow of water and prevent overflow. Permeable paving is another good option.

2. Tackling Contaminants

Another problem of small space rain gardens is dealing with contaminants that may be present in the runoff water.

You can use a filtering system to remove them from the runoff water before it enters the rain garden. This can be done using a variety of methods such as a sand filter, a gravel filter, or a biofilter.

These filters can be installed underground or in a container above ground, if you have the room.

Urban Rain Gardens Checklist ✔️

Here’s a quick summary of the key points covered in this article!

✅1. Site Selection: Locate your site ten feet away from your home’s foundation. Choose a low-lying area with natural runoff.

✅2. Space-Efficient Design: Opt for curved shapes to maximise planting space. Your rain garden should be at least six inches deep and have a slope of no more than 10%. Use tiered designs for varied soil depth.

✅3. Plant Selection: Choose compact native plants for small spaces. Include dwarf shrubs, grasses, and wildflowers.

✅4. Construction: Ensure well-draining soil with added compost. Make sure drainage has a four-hour water flow.

✅5. Planting and Maintenance: Plant larger species at the back, fill the rest with smaller plants. Regularly remove debris and weeds. Monitor plant health and adjust where necessary.

✅6. Wildlife Habitat: Plant flowers for bees and butterflies. Consider a shallow pool for amphibians.

✅7. Overflow and Contaminant Management: Avoid overflow with steps or terraces. Integrate filtering systems for contaminants.

Urban Rain Garden: Final Thoughts

If you were in any doubts you could build your own urban rain garden, you’ll now know it’s entirely possible to build your own!

Typically, you will need a decent outdoor space, so this option is best for those of you in small houses or flats with communal areas. It’s also suitable for those living in a rainy environment looking for a more effective stormwater management system.

This is also an excellent option for those of you with time on your hands. Building a rain garden isn’t ideal for people who have stressful city jobs and are looking for a quick and easy way to capture rainwater.

All in all, rain gardens are not only innovative and enjoyable to create, they’re also brilliant for those of us looking to become more self-sufficient.

After all, you never know when you’ll be in a situation where you’ll need to put your rain garden building skills to use…

As weather becomes less and less predictable, all of us will have to get used to thinking out of the box when it comes to tackling stormwater runoff and other issues that arise from erratic meteorological conditions.