Trench Drains: Channel Drainage for Large and Busy Floors

When water spreads across a large floor, or arrives in quantity from hoses, vehicles or rain, a single point drain is often not enough. Trench drains solve this by intercepting water along a line, so floors can be laid with simple one-way falls and water is caught before it reaches doors, ramps or dry areas.

Jawdah includes trench drains in its sanitary ware and drainage family. Their material, dimensions and grating options are not yet published, so this page covers the engineering basics and the choices you will need to make before asking the Jawdah team for a confirmed proposal.

A trench drain, also called a channel drain, is a linear collector. Instead of shaping a floor into many slopes that run to separate outlets, the floor falls toward one channel line. Water enters through the grating at any point along the run, flows along the channel and leaves through one or more outlets or a sump connected to the drainage pipework.

This approach handles larger flows and wider areas than point drains, keeps floor gradients simple and lets designers place the drainage line exactly where water must be stopped, for example at a door threshold or the foot of a ramp.

Jawdah lists Trench Drain as a category with one product item, the Trench Drain. No descriptive text, material, channel width or depth, length, grating design, load rating or outlet size has been published for it.

These values are confirmed by the Jawdah team for each project. The general guidance below explains what each of them means so you can describe your needs clearly.

A trench drain is assembled from a small set of components, usually supplied as a system.

• Channel body: the open trough, formed in metal, polymer concrete or plastic, or cast in situ.
• Grating: the removable top that admits water and carries traffic.
• Frame or edge rail: protects the channel edge and seats the grating.
• Outlet or sump unit: connects the channel to the pipe, sometimes with a silt basket.
• End caps: close the ends of each run.
• Locking devices: hold gratings in place under traffic.

Channels are either constant-depth, laid level so the floor and pipe gradient do the work, or built with an internal fall that increases depth along the run to speed flow toward the outlet. Hygienic stainless steel channels with rounded internal corners are common in food areas, while polymer concrete and cast channels are typical in car parks and external paving.

Grating styles include slotted bars, perforated plates, mesh, heel-safe gratings for pedestrian areas and slot-type or tile-insert tops that leave only a narrow opening visible in finished floors. The grating choice affects flow capacity, debris capture, comfort underfoot and appearance.

Trench drains are chosen where water volume, floor area or traffic make point drains impractical.

• Commercial kitchens and food processing halls.
• Car parks, ramps and basement entrances.
• Vehicle wash bays and workshops.
• Loading docks and service yards.
• Pool decks, plazas and landscaped paving.
• Industrial floors and plant rooms with wash-down.

Start with the catchment: the floor area draining to the channel and the type of water, such as rain, wash-down water or process water. This sets the flow the channel and outlets must carry. Next, define the traffic over the grating, from foot traffic to forklifts or trucks, because it determines grating and channel strength.

Then decide the channel route and length, the number and position of outlets, whether a silt basket or trap is needed, and the grating style and material. In food and hygienic areas, cleanability and corrosion resistance usually lead to stainless steel; in heavy external areas, load capacity leads the choice.

Point floor drains suit rooms with modest, localised water, such as bathrooms and small kitchens. Jawdah's rectangle hidden drain, presented on the Stainless Steel Linear Drains page, covers shower lines at bathroom scale.

Trench drains take over when the catchment is wide, flows are high or the drainage line must span a doorway, ramp or whole hall. They also allow simpler floor falls over large areas.

Lift gratings at regular intervals, remove debris and sediment from the channel and empty any silt baskets. In kitchens, clean daily to stop grease building up. Check that gratings stay locked and seated, and replace any that are bent, as loose gratings are a trip hazard and can damage channel edges.

• Jawdah lists Trench Drain as a category in its sanitary ware and drainage range.
• Jawdah has not published material, sizes, gratings or load ratings for its trench drain.
• Jawdah trench drain specifications are confirmed per project.
• A trench drain collects water along a continuous channel covered by a removable grating.
• Trench drains suit large floors, high flows and lines such as doorways and ramps.
• Trench drain systems combine a channel, grating, edge frame, outlet or sump and end caps.

• Location and use: kitchen, car park, wash bay, loading area, plaza.
• Catchment area and type of water.
• Channel route and total run length.
• Traffic over the grating.
• Preferred channel and grating material.
• Grating style required.
• Number and position of outlets; silt basket or trap.
• Total channel metres, layout drawings and site delivery address.

• Trench Drain (product)
• Floor Drains
• Stainless Steel Linear Drains
• Manholes
• Sanitary Ware & Drainage