Learn how to calculate stormwater runoff and explore other considerations to help you choose the proper channel drain for your drainage needs.

► Learn more about NDS Channel Drains here [ Ссылка ] and start planning your drainage project today!

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💦 Channel drains, or strip drains, manage runoff in residential and commercial areas. They collect water from large spaces, preventing pooling, erosion, flooding, and costly damage.

💦This guide covers key factors for installing a channel drain, including calculating stormwater runoff, determining site slope, and assessing load capacity. With the right information, you can choose a drain that effectively manages water and protects your property from drainage problems.


How to Calculate Runoff:
The first step to fixing any drainage problem is to determine how much water needs to be managed.

►How to Calculate and Build a Drainage System
► Why are residential drainage systems so important?

►How Do I Determine the Stormwater Runoff on My Property?
► How do I determine the stormwater runoff on my property?

►How Do I Calculate the Volume of Stormwater Runoff for My Drainage System?
► How to Calculate the Volume of Stormwater Runoff for Your Drainage System | NDS Yard Drainage


Channel Drain Applications:
Channel drains, also known as strip or trench drains, are long linear drains that collect surface runoff over large areas. They’re typically used to prevent water from entering garages, doors, and parking lots.

When selecting a channel drain, the following things must be considered:
►How much water will be entering the channel?
►What is the slope of the surface where the channel will be installed?
►Will cars be passing over the channel?


Flow Capacity Tables:
Use NDS Flow Capacity Tables to find the water each channel drain can convey, along with flow rates through the grates and outlet capacities for each drain.

►[ Ссылка ]


How Do I Find the Right Size Channel Drain:
💦 Step 1: Calculate the runoff draining to the location of the channel drain.

💦 Step 2: Determine the slope of the surface where the channel drain will be installed. The slope on a channel drain greatly affects the amount of water the channel can convey.

💦Step 3: Find the slope (%) on the flow capacity table for your site. Compare the "Flow Discharge" rate to the runoff from Step 1. If the flow rate is lower, pick a larger channel drain. If it's higher, check the next table for grate load capacity and flow rates per foot.

💦 Step 4: Ensure the grate’s load capacity meets or exceeds expected loads:

►Class A: Up to 60 PSI - pedestrian
►Class B: Up to 175 PSI – passenger cars, SUVs
►Class C: Up to 325 PSI – semi-trucks
►Class D: Up to 575 PSI – heavy forklifts

Multiply the “Flow Rate” by the channel length to get flow capacity. If it’s less than the runoff, pick a larger channel. If greater, check the next table.

💦 Step 5: Determine which outlet will drain the channel. If the flow rate in the “Flow Rate” column is less than the runoff, opt for a larger drain or different outlet. If the flow rate is higher than the runoff, the chosen channel drain will work for your project.

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Homeowner Drainage Resources
► Home Drainage Center [ Ссылка ]
► Find a Contractor [ Ссылка ]
► Where to Buy [ Ссылка ]
► Pop-up Drainage Emitter [ Ссылка ]
► Flo-Well Dry Well [ Ссылка ]

Professional Drainage Resources
► Discover Commercial Drainage Solutions [ Ссылка ]
► Get Free System Design Support [ Ссылка ]
► Find Technical Specifications [ Ссылка ]
► Request a Quote [ Ссылка ]
► Find a Commercial Drainage Dealer [ Ссылка ]

Drainage Calculators to Calculate Run-Off and System Requirements
► [ Ссылка ]

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0:00 - Opening
0:49 – Questions to Consider
0:59 – Flow Capacity Tables
1:19 – Step 1: Runoff Amount
1:25 – Step 2: Slope
1:42 – Step 3: Calculated Flow Rate vs Channel Flow Capacity
2:14 – Step 4: Calculate Load Capacity & Total Flow Capacity of the Grates
3:19 – Step 5: Determine Outlet to Drain the Channel

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