Pondless Waterfall: Water drops over rocks into a hidden underground basin — no open pond. Safe for kids and pets, easy to maintain, and works great in small yards.
Stream & Waterfall: Water flows along a stream bed and drops into a hidden basin. Pick a longer liner to match how far you want the stream to run.
Water in Transit (WIT) is how much water is moving through your stream at any one time. When the pump turns off, all that water drains back into the basin — so the basin needs to hold all of it.
Recommended basin: 2.5× your WIT · Minimum: 1.5× WIT
Use the calculator below to find your numbers.
Pick your liner size below. Use the calculator first — your best match will be highlighted in orange.
Enter your stream dimensions to find out how much water you're moving and how big your basin needs to be.
* Tip: 3 inches deep = 0.25 ft. Stream only — measure pools separately and add to basin volume.
Select your liner size below. Calculate your WIT above first — your best match will be highlighted in orange.
MatrixBlox replace gravel in your basin. They hold a lot more water in a smaller space, which means less digging and a more reliable feature.
- Holds way more water than gravel — 96% void space, 31.5 gallons per block
- Less digging — same water capacity in a smaller hole
- Holds weight — safe under boulders, pavers, and sod
- Easy to install — panels snap together in seconds
Note: The 10,000 GPH kits always come with MatrixBlox — they'll show up either way.
