question markFrequently Asked Questions

You asked, we listened. Find answers to all your technical questions about NDS trench drains, catch basins and accessories as well as installation tips and chemical resistance guidelines.  Be informed before you buy!

Do NDS channel drains have decorative grates?

bronze and aluminum grates for mini channelMany of NDS’s channel drain systems offer decorative grates.  The NDS Mini Channel and Spee-D Channel systems provide decorative plastic grates as well as decorative cast iron grates.  The NDS Dura Slope system offers decorative iron grates and perforated stainless steel grates.

Is there an edge line between the concrete/paver and the grate?

Because NDS grates rest inside the lip of the channel, there is an edge line where the channel is visible. New decorative plastic grates for the Mini Channel and Spee-D Channel eliminate the edge line, which lends the drain systems more decorative appeal.

What does Load Rating mean?

Load rating measures trench drain compression resistance - how much weight a trench drain can withstand without structural damage - based on DIN 19580 international guidelines, which separate drainage applications into six categories:

  • Load class A icon Load Class A
    3,372lbs. - 15 kN
    Residential, pedestrian, and cyclist traffic
  • Load class B icon Load Class B
    28,100lbs. - 125 kN
    Sidewalks, parking lots, and car parking decks
  • Load class C icon Load Class C
    56,200lbs. - 250 kN
    Curb sides, highway shoulders, and parking areas
  • Load class D icon Load Class D
    89,920lbs. - 400 kN
    Trafficked sections of roads and highways
  • Load class E icon Load Class E
    134,800lbs. - 600 kN
    Industrial areas, forklifts, traffic, ports, and dock sides
  • Load class F icon Load Class F
    202,320lbs. - 900 kN
    Aircraft runways, docks, and high-impact wheel loads

Can NDS trench drain be used in in driveways?

NDS Dura Slope and Pro-Series channel drains can withstand load traffic on driveways with proper grating. The NDS Spee-D Channel can be installed in low-traffic driveways if it is recessed 1/4" in the concrete.

The Micro Channel and Mini Channel systems are not rated for vehicle traffic.

Why do I need a coupler for the Mini Channel and Spee-D Channel drains?

NDS Mini Channel couplerBecause they do not feature tongue-and-groove connection mechanisms, the Mini Channel and Spee-D Channel by NDS use a plastic coupler to connect channels together.

I need a project consultant. Who do I speak with?

Trench Drain Systems is proud to offer project consultations for all interested contractors, architects and engineers.  Our technical specialists are trained in chemical resistance, load rating and flow rates for NDS trench drain, Polycast trench drain, ACO trench drain, MEA-Josam, ABT Trench Drain, Zurn trench drain and more.

Please call a Trench Drain Systems technical specialist at 610-638-1221.

What is the slope of the Dura Slope system?

The Dura Slope system features a 0.7 percent slope

Why and when do I need a project layout?

Trench Drain Systems requires all customers purchasing pre-sloped trench drain systems to sign off on a project layout.  This ensures that outlet depth is correct, preventing costly error and allowing us to ship your order more efficiently.

project layout example

A project layout is not needed for Micro Channel, Mini Channel, and Spee-D Channel projects.

How do you pack & ship my order?

shipping palletAt Trench Drain Systems, we have a variety of package and freight carriers we work with.  The size of your order will dictate which carrier we use.  We pack your order in the best manner to assure safe delivery to your job site.

Whether it's boxes or pallets, our experienced staff is ready to pack and handle shipping for your order. 

What are your return policies?

Trench Drain Systems charges a 25% restocking fee on all returned orders.  Due to time and cost, additional charges for custom fabrications, channel miter cuts, non-standard grating finishes and express shipping cannot be refunded.

My drains arrived damaged. What now?

ALWAYS note any damage on the form before signing for any shipment.  Trench Drain Systems is not responsible for damage occurring during delivery.  However, we are happy to assist our customers with freight claims.

How long does shipping take?

Most orders ship same day or next day depending on what material is in stock.  Delivery times will vary based on the size of the order and distance from our warehouse to your jobsite.

Is there a minimum order fee?

Due to credit card processing fees, Trench Drain Systems includes a $40 minimum order fee on all credit card purchases less than $200. This charge does not apply for orders placed on or

What forms of payment do you accept?

TDS gladly accepts cash, checks, Visa, Mastercard, Discover, and American Express.

credit cards

TDS charges a $50.00 fee for checks returned for non-sufficient funds.


Trench Drain Systems is a leading supplier of channel and trench drain from the top manufacturers in the drainage industry.  Our product lines include Polycast, NDS, MultiDrain, MEA, Zurn, J.R. Smith and Infinity Drain.  We carry drainage systems in a broad range of channel materials such as steel, concrete, fiberglass, HDPE, polymer concrete and cast iron. We also sell trench forming systems, such as EconoDrain, and slot drain systems.

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