How to Build a Rain Garden

Rainwater to Habitat, not Runoff

Every time it rains, your roof sheds thousands of gallons of clean water.

Most of that water rushes into storm drains, erodes your landscape, floods low spots, or disappears before your plants can use it.

A rain garden changes that.

By slowing, spreading, and soaking rainwater into the soil, rain gardens reduce runoff, recharge groundwater, support native wildlife, and create one of the most beautiful ecosystems you can add to your yard.

Start Here

Is a Rain Garden Right for Your Yard?

A rain garden is ideal if you have:

Standing water after storms
A downspout that dumps onto your lawn
Erosion
Water flowing across sidewalks or driveways
Compacted soil
A soggy area that dries by summer
A desire to create wildlife habitat

A rain garden is not a pond.

Water should soak into the soil within 24–48 hours after a storm.

Step One

Follow the Water

Before you dig anything, spend time watching your yard during a rainstorm.

Nature is already showing you where the rain garden belongs.

Look for:

Downspouts
Low areas
Natural swales
Erosion channels
Areas where water already collects
Places where water leaves your property

The best rain gardens work with existing water movement rather than fighting it.

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Step Two

Measure Your Roof Runoff

How much water is actually leaving your roof?

Learn how to calculate:

Roof catchment area
Impervious surfaces
Average rainfall
Downspout drainage areas

Include formulas.

Examples.

Illustrations.

Interactive calculator if possible.

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Step Three

Test Your Soil

Your soil determines almost everything.

Explain:

Clay

Loam

Sand

Simple infiltration test

Percolation rates

Drainage

Compaction

Organic matter

Why healthy soils absorb dramatically more water.

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Step Four

Choose the Perfect Location

Cover:

Distance from the foundation

Distance from septic systems

Distance from wells

Utility locating

Property setbacks

Retaining walls

Tree roots

Slopes

Existing drainage patterns

Sun exposure

Accessibility

Future maintenance

Include diagrams.

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Step Five

Size Your Rain Garden

Teach people:

Drainage Area

Ponding Depth

Overflow Capacity

Maximum Size

Recommended Depth

Slope Percentages

Shape

Why shallow is usually better than deep.

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Step Six

Design the Basin

This deserves its own page-length section.

Cover:

Natural shapes

Curved edges

Shelf planting

Bottom basin

Overflow spillway

Side slopes

Rock placement

Microhabitats

Viewing angles

Access paths

Where wildlife hides

Why natural systems avoid perfect circles.

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Step Three

Step Seven

Build Healthy Soil

This is where Urban Rewilding becomes unique.

Don't just say

"Add compost."

Teach soil ecology.

Cover:

Forest soils

Fungi

Leaves

Wood chips

Organic matter

Microbes

Why roots matter

Mulch

When NOT to amend soil

Biochar

Woody debris

This section could become one of your best-performing SEO pages by itself.

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Step Eight

Excavation

How to excavate

Machine vs hand digging

Saving topsoil

Checking elevations

Laser levels

Overflow outlet

Protecting existing roots

Preventing compaction

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Step Nine

Disconnect the Downspout

Materials

Splash blocks

Pipe sizing

PVC

Corrugated pipe

Rock channels

Open channels

Pretreatment

Sediment traps

Clean-outs

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Step Ten

Build the Overflow

One of the most overlooked parts.

Cover:

Emergency overflow

Extreme storms

Rock spillways

Where overflow should go

Protecting neighboring properties

Preventing erosion

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Step Eleven

Choosing Materials

Compare:

River rock

Basalt

Gravel

Wood chips

Logs

Large woody debris

Boulders

Native mulch

Avoid landscape fabric.

Explain why.

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Step Twelve

Plant Like Nature

Instead of organizing by plant type...

Organize by moisture.

Wet Zone

Plants that tolerate standing water.

Moist Zone

Plants that like periodic saturation.

Edge Zone

Plants that prefer occasional moisture.

Dry Transition Zone

Plants blending into surrounding landscape.

Then list Oregon natives.

This becomes incredibly useful.

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Step Three

Step Seven

Let’s Work Together

Get in touch so we can start working together.