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Blue Thumb Canyon Matrix black molded waterfall reservoir with slotted sidewalls, circular pump access lid, and side hose opening.

Canyon Matrix™ – Pond-less Waterfall Reservoir

SKU:
PB2989
$199.99
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PROUDLY MADE IN THE USA!

• Water Storage: 21 Gallons
• Maximum Pump Flow: 2,500 GPH
• Dimensions: 26.5"L × 16"W × 11.5"H (13"H with lid)
• Construction: One-Piece Molded Reservoir with Removable Pump Access Lid
• Optional Auto Fill: Compatible with PB1342 (Sold Separately)
• Warranty: Lifetime Manufacturer Warranty on Canyon Matrix engineered plastic component
• Note: Pump, Liner & Plumbing Sold Separately
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Description
 
Blue Thumb Pond-less Waterfall Reservoir

Canyon Matrix™ – Pump Protection and Water Storage in One

Build a beautiful pond-less waterfall without a traditional open pond. Our Canyon Matrix™ combines an underground water-storage reservoir with an integrated pump-access chamber, giving smaller cascading waterfalls and backyard streams a compact recirculating foundation.

Its one-piece molded construction maintains open water-storage space while protecting the submersible pump. A removable access lid simplifies pump inspection and maintenance after installation.

Water Storage 21 Gallons
Maximum Pump Flow 2,500 GPH
Reservoir Footprint 26.5" × 16"
Height With Lid 13"

A Smarter Foundation for Smaller Waterfalls

Integrated Pump Access

The Canyon Matrix combines water storage and a protected pump chamber in one molded unit. Its removable lid provides access to the pump without dismantling the surrounding waterfall.

Underground Water Storage

The 21-gallon reservoir maintains open storage space beneath the decorative rockwork. Slotted sidewalls allow returning water to enter the chamber for recirculation.

Is the Canyon Matrix Right for Your Waterfall?

The Canyon Matrix is designed for smaller pond-less waterfall installations where the pump and water reservoir can be contained within one compact underground component.

It is rated for pump flow up to 2,500 gallons per hour. Choose your pump based on the waterfall's required flow at its operating height, plumbing resistance, and the reservoir's available water capacity.

Before You Order

This is the Canyon Matrix reservoir, not a complete waterfall kit. A working pond-less waterfall also requires a compatible pump, waterfall spillway, liner, protective underlayment, plumbing, and installation materials.

If you prefer a coordinated system that already includes the primary waterfall components, consider our DIY Mini 10" Cascading Falls Kit or DIY Small 20" Cascading Falls Kit .

What's Included and What You'll Need

Included With the Canyon Matrix

  • One-piece molded Canyon Matrix reservoir with integrated pump chamber
  • Removable circular pump-access lid
  • Slotted water-entry sidewalls
  • 2" diameter hose-passthrough opening
  • Molded automatic water-fill connection

Other Waterfall Components

Canyon Matrix™ Technical Specifications

Product SKU: PB2989
Product type: Pond-less waterfall reservoir with pump-access chamber
Reservoir dimensions: 26.5" L × 16" W × 11.5" H
Overall height with lid: 13"
Water-storage capacity: 21 gallons
Maximum pump flow: 2,500 GPH
Pump-access opening: 11.25" diameter
Access-lid dimensions: 12" diameter × 1.5" H
Hose passthrough: 2" opening for 1.5" flexible hose
Construction: One-piece molded engineered plastic
Auto-fill connection: Integrated spinweld; optional kit sold separately
Recommended excavation: Approx. 28" L × 22" W × 13" D
Country of origin: Made in the USA
Manufacturer warranty: Lifetime limited coverage against qualifying manufacturing defects

The 21-gallon specification describes the reservoir's stated storage capacity. Actual operating water availability depends on water level and the complete waterfall installation.

Planning Your Canyon Matrix Installation

The Canyon Matrix is installed inside a lined underground basin at the lower end of a pond-less waterfall or stream. Proper excavation, liner placement, and water-entry clearance are important for reliable operation.

Plan the Reservoir Location

Position the Canyon Matrix where the waterfall or stream will return water to the underground basin. Keep the pump-access lid accessible for future maintenance. Contact your local utility-locating service before digging.

Excavate the Basin

Our installation guide recommends an excavation approximately 28" long × 22" wide × 13" deep. This allows approximately 3" of additional space on each long, slotted side for water movement and gravel placement.

Install Underlayment and Liner

Remove sharp rocks and roots from the excavation. Install protective underlayment followed by rubber liner. Leave sufficient liner extending beyond the basin and up the planned streambed before trimming.

Position the Canyon Matrix

Place the reservoir inside the lined basin. Center it so both long, slotted sides retain approximately 3" of open space. Fill those spaces with rinsed river rock large enough to remain outside the slots.

Connect the Pump and Complete the Waterfall

Install a properly sized submersible pump in the accessible chamber and route its plumbing through the hose opening. Connect the pump to your waterfall spillway, complete the rockwork, fill the reservoir, and test the system. Follow the official installation guide for full details.

Optional Automatic Water-Level Control

The Canyon Matrix includes a molded connection for adding an automatic water-fill system. This allows a compatible fill valve to replace water lost through evaporation and splashing.

Our Hudson 1/2" Automatic Water Fill Kit (PB1342) is available separately. The fill kit has a maximum water-pressure rating of 30 PSI, so review its installation requirements and pressure-regulator recommendations before connecting it.

Maintenance and Seasonal Care

  • Monitor water levels: Check the reservoir regularly and refill as needed. Operating the pump without adequate water can cause damage.
  • Keep water moving freely: Remove leaves and debris that could restrict water flow through the surrounding gravel or pump intake.
  • Inspect your pump: Use the removable access lid to check the pump and clean the intake according to the pump manufacturer's instructions.
  • Prepare for freezing weather: If shutting down for winter, remove and store the pump according to the seasonal maintenance guide. Keep the underground basin at least half full to reduce the risk of freeze-thaw heaving.

Product Resources and Installation Guides

Review our official documentation before installation. These resources include illustrated reservoir placement, excavation dimensions, plumbing guidance, maintenance, and warranty information.

Canyon Matrix Installation Guide (PDF) Pond-less Waterfall Maintenance & Winter Care (PDF) Blue Thumb Manufacturer Warranty (PDF) Additional Installation Resources

Blue Thumb Lifetime Manufacturer Warranty

The Canyon Matrix is backed by our lifetime manufacturer's warranty for Blue Thumb engineered plastic components against qualifying manufacturing defects.

Coverage applies to the original purchaser and is subject to proper installation and the manufacturer's warranty conditions. Post-purchase product modifications void coverage. Labor and freight costs are excluded.

Review the complete Blue Thumb warranty terms.

Questions About Your Waterfall Installation?

Not sure whether the Canyon Matrix provides enough water storage or pump capacity for your project? Our Sales and Technical Team can help you evaluate your waterfall layout, pump selection, and installation requirements before ordering.

Call 888-619-3474 Email Our Sales/Tech Team

Canyon Matrix™ Product Overview Video

Watch our Canyon Matrix product overview to learn more about its combined water-storage and pump-access design, compact dimensions, and use in pond-less waterfall installations. The demonstration also discusses how multiple Canyon Matrix units can be used when planning larger projects.

Video courtesy of Blue Thumb. Additional Canyon Matrix units, pumps, and waterfall installation components are sold separately.

Frequently Asked Questions

Does the Canyon Matrix include a pump?

No. The Canyon Matrix includes the molded reservoir and removable pump-access lid. The pump, plumbing, liner, waterfall spillway, and other installation materials are purchased separately.

What size pump can I use with the Canyon Matrix?

The Canyon Matrix is rated for pump flow up to 2,500 GPH. The appropriate pump must also fit inside the access chamber and deliver the required waterfall flow at your installation's operating head. Contact our Sales/Tech Team if you need help selecting a compatible pump.

How much space should I allow for installation?

Our installation guide recommends an excavation approximately 28" long × 22" wide × 13" deep. The additional width accommodates the gravel-filled water-entry spaces beside the long slotted walls. Allow additional room for the stream and waterfall.

Can the Canyon Matrix be used with a 10" or 20" DIY Cascade Box?

Yes. Our DIY Mini 10" and DIY Small 20" Cascading Falls Kits both use the Canyon Matrix as their underground reservoir. When purchasing components individually, make sure the pump, spillway, plumbing, and water-storage capacity are properly matched.

Can I add an automatic water-fill kit?

Yes. The integrated spinweld accommodates our optional Hudson Automatic Water Fill Kit, PB1342. The kit is sold separately and must be installed according to its water-pressure and connection requirements.

Will the 21-gallon reservoir eliminate the need to refill my waterfall?

No. Water can still be lost through evaporation, splashing, and wind. The 21-gallon specification describes the reservoir's storage capacity, not a guaranteed usable operating reserve. Monitor the water level regularly or consider adding the optional automatic water-fill kit.

What should I do with the Canyon Matrix during winter?

If you shut down your pond-less waterfall, follow the pump manufacturer's winter-storage instructions. Our seasonal maintenance guide recommends leaving the underground basin at least half full to reduce freeze-thaw heaving. Review the guide for full winterization procedures.