Requirements
What Are The Requirements?
*Your rain garden can be a DIY project, or you can hire a landscaper/contractor.
- Submit your application.
- You will receive an email to schedule an in-person site assessment.
- At the time of site assessment, a representative will help you determine your site conditions and answer any questions relating to design and plant selection.
- After assessment is complete, we will send you an estimated rain garden size, estimated volume of stormwater it will capture, and the reimbursement amount you could receive.
- Conduct a percolation test. Record your results and submit this form
- Create your rain garden diagram. Next, you will be required to submit a diagram of your property and rain garden
- Use the diagram and plan examples to guide you
- Use this checklist to ensure all required information is present
- Create your planting design and plant species list! *Plant list must include the scientific/Latin name and common name of each species.
- For design, choose from the approved templates or create your own.
- Calculate the number of plants your rain garden will require (calculate here)
- For species selection, we recommend using these resources:
- RainSmart Plant Guide
- Wildflower.org Plant Database *filter your search by state and your unique site conditions
- PRO TIP: Choose perennial species that are adapted to a wide range of moisture conditions
- Sign the Homeowner’s Agreement
- Submit the following documentation for approval:
- Property diagram & rain garden diagram
- Planting design & plant species list
- Homeowner’s agreement
- Once approved, you can begin phase one of your project: digging your rain garden to subgrade. *If using a contractor, be sure to keep all receipts. Receipts must be itemized to be eligible for reimbursement.
- Upon completing phase one, submit a photo of your rain garden’s subgrade.
- We will email you a link to schedule your phase one inspection to confirm the rain garden subgrade meets program criteria.
- Once you have passed inspection, you can begin phase two and complete your rain garden installation.
- When you have completed your rain garden, submit all rebate-eligible receipts and a photo of your project.
- Once we have received your documentation, you will receive a link to schedule your final site inspection.
- A representative will come to assess your completed project. If your rain garden meets the program criteria, we will begin processing your reimbursement.
Am I Eligible?
- Must be a City of Chattanooga resident
- Must be up to date on your stormwater fee and property taxes (check here)
- Applicants must sign the Homeowner’s Agreement, which includes a 5 year maintenance commitment. If renting, the renter and property owner must sign our homeowner's agreement.*
- Gutters must be present and direct rainwater to a rain garden or rain barrel using approved methods.
- Property must pass a percolation test and subgrade inspection.
Consider applying to host a RainGarden demonstration workshop. Workshops are a great opportunity to educate members of the community on rain gardens, including how they function and their environmental benefits. Receive planting labor assistance, RainSmart experts on-site to lead, and lunch provided by the City. Workshop opportunities include plant installation and seasonal maintenance guidance.
Some Conditions And Restrictions On This Application
Eligible rain gardens can receive reimbursement up to $2000 per property. The following items are examples of “rebate-eligible costs.” They are items necessary to the construction of a SupportScape. Other items which may only serve as decorative or non-functional additions do not qualify. The City shall, in its sole and reviewable discretion, determine whether a cost submitted by the Homeowner is rebate-eligible. Undocumented costs are not rebate-eligible. The City of Chattanooga will approve reimbursement based on the availability of funds
Rebate Eligable Costs
- Reimbursement for size/volume, $10.00 per square foot of constructed rain garden
- Reimbursement for materials, $2.50 per square foot of constructed rain garden.
- The following are examples of rebate-eligible materials:
- Conveyance piping, connectors (does not include gutters)
- Native plants, seeds
- Soil
- Compost
- Sand
- Mulch
- Stone
Helpful Resources
- Homeowners Guide to Building Your Own Rain Garden
- Percolation Test Form
- Planting Design Templates
- RainSmart Native Plant Selection Guide
- RainSmart Required Diagram Examples
- Rain Garden Checklist
- Rain Garden Homeowners Agreement
Plant Information
- Native Plant Database, Ladybird Johnson Wildflower Center
- NC Extension Gardener Plant Toolbox
- Flora of the Southeastern US, NCBG
- Mt. Cuba Center Native Plant Finder
- Plants for Birds, Audubon
- USDA Plant Database
- Keystone Plants for Ecoregion 8
- Tennessee-Kentucky Plant Atlas
- TN-IPC Invasive Plants List
Miscellaneous
- SunCalc.org - check your property's sun conditions
- Calculate # of plants needed for your project
- "How to Pick Native Plants for Drainage Areas"
- Creating a Garden-scale Grassland: Part 1
- NatureServe Explorer
Apps
Organizations
- Tennessee Valley Wild Ones
- Tennessee Native Plant Society
- Southeastern Grasslands Institute
- TN Invasive Plant Council
- Southeastern Plant Conservation Alliance
- Southeast Stormwater Association
- Center for Plant Conservation
Additional Resources
FAQ
Is a rain garden right for my yard?
- While rain gardens are a great way to infiltrate stormwater and support our local pollinators and ecosystem, they are not suitable for all yards and cannot solve all stormwater-related issues.
- Because the underlying soil determines the infiltration rate of water, a spot in your yard that does not infiltrate water well currently will not infiltrate better as a rain garden. Conduct a percolation test to determine if your soil type is suitable.
- Rain gardens must be planted 10 feet from your home’s foundation and 25 feet from any septic tanks or wellheads. Consider the size of your yard and area you’d like to plant the rain garden when deciding if this project is right for you.
Rain gardens perform best on a mostly flat grade. If infiltration or erosion needs to be addressed on a steep slope on your property, instead consider our SupportScapes program.
What kind of maintenance does a rain garden require?
Rain gardens are planted with native plants, which require minimal maintenance. Weekly watering and weeding is needed during the first couple years as the plants become fully established. Fertilization is unnecessary, as native plants are adapted to local soils and absorb excess nutrients. Pruning and additional mulching as needed will help keep your rain garden healthy and happy!
Will my rain garden have standing water? What about mosquitoes?
Rain gardens are designed to easily infiltrate water and will not hold standing water for long periods of time. Mosquitoes need standing water for 5-12 days in order to breed and complete their life cycle. Rain gardens may even help prevent mosquito populations by infiltrating water into the ground quicker than turf grass or bare soil, and rain gardens can attract beneficial insects who feed on mosquitoes.