Underground Downspout Drain – Complete Guide

Underground Downspout Drain

Hi, Friend, In this post, we will provide information on Underground Downspout Drain, their benefits, and how to install them. An underground downspout drain is an important part of a building’s drainage system. An underground downspout drain protects the building’s structure by diverting rainwater away from the foundation.

What Is an Underground Downspout Drain?

An underground downspout drain is a pipe connected to the downspout of a gutter system and diverts water away from the home to an appropriate location. PVC or corrugated pipe is used for underground downspout drains. This pipe is covered with gravel or filter fabric. Therefore, it does not clog and allows water to seep in.

Downspouts are connected to the gutter line. They are usually located at the steepest corners of the house. This allows for water drainage. The water is then channeled into an underground drainage system. Runoff also prevents the growth of algae or mildew on your roof or where your roof meets the walls of your home.

Types of Underground Downspout Drains

There are several types of underground downspout drains, including:

  1. PVC Pipe System: This type of system consists of PVC pipes and fittings that are connected to downspouts. And it is installed underground. PVC Underground Downspout Drains are durable, easy to install, corrosion-resistant, and resistant to chemical damage.
  2. Corrugated Pipe System: Corrugated pipes are made of lightweight plastic or metal. It is available in various sizes. Corrugated pipe systems are a popular choice for residential drainage systems. It is cost-effective, flexible, and easy to install
  3. French Drain System: A French drain system is installed at a low point around the perimeter of the house. It involves covering the PVC pipe with gravel or other drainage materials. It is a more complicated system to install, but it can be an effective option for removing water from the foundation.
  4. Dry Well System: A dry well is a large underground chamber. which collects rainwater and allows it to infiltrate into the surrounding soil. It is a good option for areas where soil drainage is poor.

Benefits of Underground Downspout Drains

  1. Underground downspout drains prevent water damage to the home’s foundation. When rainwater collects around the foundation, it can seep into the basement or crawl space, causing water damage, mold growth, and structural problems. By diverting water away from the foundation, underground downspouts protect the home from these problems.
  2. When rainwater runs off roofs and onto the ground, it can cause soil erosion and damage to plants and landscaping. Underground downspout drains prevent erosion and landscaping damage. Underground downspouts divert water away from these areas, protecting the soil from erosion damage.
  3. An underground downspout drain can improve the overall appearance of a property. Traditional above-ground downspout systems can be unsightly and take up valuable outdoor space. Underground downspout drains are hidden from view, creating a cleaner, more refined appearance.

Underground Downspout Drain Cost

Underground Downspout Drain Cost

Underground downspout drain costs between $200 and $2,000. Underground downspout drain cost varies depending on climate, soil type, and property size. You should consult with a professional to determine the best system for your needs.

Underground Downspout Drain Repair

Repairing underground downspout drains is a challenging task. But, it is essential to prevent water damage to your home’s foundation and landscaping. Here are some steps to repair an underground downspout drain:

  1. Find the problem area:
  2. Remove the damaged section
  3. Replace the damaged section
  4. Connect the replacement section
  5. Test the repair

Underground downspout drain repair can be challenging and may require professional assistance. If you are unsure about the Underground downspout drain repair process or the degree of the damage, you should hire a professional plumber.

How To Unclog Downspout Underground Drain?

A clogged underground downspout drain can cause water to back up and cause foundation or landscaping damage to your home. The following are steps to unclog an underground downspout drain:

  1. Find the Clog: Sometimes, materials like leaves, sticks, or dirt cause the blockage. So it is necessary to find the location of clog drain
  2. Remove the Clog: Use a plumber’s hose or a pressure washer to remove the clog. When using a pressure washer, be careful not to damage the pipe.
  3. Flush the Drain: Once the blockage is removed, use a garden hose to flush the drain and ensure adequate drainage. Use a solution of water and vinegar to clean the inside of the pipe and remove any remaining dirt.
  4. Prevent Future Clogs: Consider installing a downspout strainer or leaf guard to prevent debris from entering the drain and causing future clogs.

How to Install an Underground Downspout Drain?

Here are the steps to install an underground downspout drain:

  1. Choose a Location: Determine the location of the downspout and where the water will be directed. It should be located away from the foundation of your house and other structures.
  2. Dig a Trench: Dig a trench from the downspout to where the water will be directed. The trench should be about 12 inches deep and 6 inches wide.
  3. Install the Drain Pipe: Install the PVC drain pipe in the trench. The pipe should slope away from the downspout and towards that location. Where the water will be directed.
  4. Attach the downspout to the Drain pipe: Cut a hole in the bottom of the downspout and attach it to the top of the drain pipe using PVC cement. Make sure the downspout is securely attached to the pipe.
  5. Cover the Drain Pipe: Cover the drain pipe with gravel or crushed stone.
  6. Testing of Direction of Water: Direct water to a desired location, such as a dry well or drainage ditch. Make sure water is directed away from your home and other structures.


Underground downspouts are an essential component of any home drainage system. They protect a home’s foundation from water damage, prevent erosion and damage to landscaping, and promote proper drainage. Installing an underground downspout drain requires excavation and trenching. The process of installing an underground downspout drain is simple.

If you are experiencing water damage or landscaping issues due to rainwater, consider installing an underground downspout drain to protect your home.

Frequently Asked Questions

Underground Downspout Drain Cost

Underground downspout drain costs between $200 and $2,000. Underground downspout drain cost varies depending on climate, soil type, and property size. You should consult with a professional to determine the best system for your needs.

Best Materials for Underground Downspout Drain Pipes

PVC, or polyvinyl chloride pipe, is the best option for underground water drainage. PVC pipes are extremely durable. Moreover, they are soft and come in different sizes. PVC drainage pipes are also very eco-friendly, making them a popular choice among homeowners.

Cost to Repair an Underground Downspout Drain

Underground downspouts cost between $200 and $2,000. This yard drainage system is easy to install. Downspouts direct water away from the perimeter of your home and into a municipal sewer or drain.

Signs of a Clogged Underground Downspout Drain

  1. Water Leaks and/or Damage in Your Basement
  2. Overflowing Gutters
  3. Water Overflowing or Pooling at the Downspout Connection
  4. Slow or No Waterflow at the Drain’s Exit Point

Leave a Comment

Your email address will not be published. Required fields are marked *

Scroll to Top
Scroll to Top