Santa Cruz Landscaping: Clay Lined Ponds

I had a chance this week to return to a project that we finished last year in Watsonville, which is just outside of Santa Cruz.

This project was an existing 50,000 gallon natural pond with a small stream flowing onto it. 

Our job was to re-work the pond, stabilize the edges and add a waterfall.

So, we drained and reshaped the pond and imported clay pond-fill. 

Using clay as a pond liner is great for natural ponds that don't need a contained system or a consistent water level. Bentonite clay makes a great pond liner, because it expands when it gets wet and seals in almost all the water.

We did some rock work around the edges of the pond for stability, and added a gravel beach area for swimming access. The pond was to be kept as natural as possible because it is going to be used as a turtle and frog habitat. 


Once the pond was complete we added a waterfall and a biological filter system. We wanted this system to have natural filtration only. 

We used locally harvested Limestone for all the rock work.

The waterfall runs off a 3/4 horse power external pump. We installed two 6 inch bottom drains that gravity feed into a small bog. 
The pump draws water from the bog and pushes it to the top of the waterfall. 

At the top of the falls we installed the biological filter. This is a small bog like area that the water percolates through. It is filled with gravel and has filtering and decorative aquatic plants. The biological filter works by allowing beneficial bacteria a place to live and help filter the water as it passes through.

We added some low voltage landscape lighting and landscaped the project area.