a garden with rocks and water features labeled in the following words, along with instructions on how to install them
pondtrademag.com

Sizing Gravel-filled and Water Matrix Reservoirs for Pondless Features - POND Trade Magazine

Building a Pondless water feature? Get the engineering right the first time! Learn from a pond industry veteran the "how-to" on sizing vaults and flows when building features such as a long stream. Learn the formula to accurately calculate the Dynamic Volume, so you won't overflow or be caught short of water.
Kelly Martens

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