The perfect and even moisture level is the key to a perfect arena surface – think of what it’s like riding on the beach at low tide!
Even moisture in horse arena footing is essential for keeping the arena surface uniform, but not all watering systems are created equal. When it comes to watering your horse arena, sub-surface irrigation systems are much more efficient and environmentally friendly than any standard overhead sprinkler system.
We are often asked which underground watering system for horse arenas would be better for our clients. While we are installers for both the HIT Active Aqua UnderGround Watering System and also the Ebb- and Flow System, we would like to explain the difference in the technical aspects, as well as pros and cons of each system. While both systems are suitable for all climates in indoor and outdoor arenas alike, which is the more appropriate option does differ depending on the region and climate.
Construction and Configuration
Here, let’s examine the construction processes of each system that we offer.
HIT Active Aqua UnderGround Watering System for Horse Arenas
- The fence posts with kickboards are installed.
- A free draining base with 4-5″ of a clean 3/4 DrainRock sloped @ 1% longitudinally.
- A special permeable liner covers the rocks followed by HIT DrainGrids as the PERMANENT separation layer between the rocks and the arena footing. Rocks or the liner will never migrate into the arena surface.
- Arena footing
- A fine sand is being installed above the DrainGrids 4-6 inches depending on the discipline. Can be constructed with sand only or a sand and fiber surface.
Graphic by Jelka UK
Ebb- and Flow Horse Arena System
- Cut and fill of the natural ground laser at 0% plane.
- Install fence posts with a concrete curb or kickboards.
- Lay down 2″ coarse sand.
- Roll out a laminated PVC waterproof liner to contain the water.
- Lay the drainage pipes covered with landscape fabric.
- Apply of a coarse sand 7 inches.
- Apply of the footing 7 inches.
- Install water level control tanks for the pump-system to maintain the perfect moisture content
Graphic by Jelka UK
The HIT system needs 50% less water than the Ebb- and Flow system. You are only watering 6-7 inches sand versus 13 inches of sand above the water pipes with the Ebb- and Flow. The capillary effect of the silica sand in both always draws the moisture up like a sponge.
Air flow in the sand
The HIT system is laid on a slow percolating liner, which still allows rain water to percolate through BUT also keeps the sand BREATHING. The sand never accumulates any algae, bacteria or fungi. The Ebb-and Flow system creates algae on the surface and mold, bacteria and fungi in the lower part of the sand which sits on a non-permeable liner.
While the Ebb- and Flow relies on the speed of the pumps to expel rain water from the surface, the HIT system works like any other Free-Draining base, but with the advantage of a permanent separation layer between the DrainRock and the Arena footing. This way the DrainRock and the non-woven geotextile liner used above the DrainRock could NEVER migrate up into the arena footing.
At Footing Solutions, we work with Galcon GSI Irrigation, a cellular web-based controller where the client can monitor the water consumption (us, too, if the client permits) of the HIT Active Aqua system.
If there are too many organic deposits, such as leaves from adjacent trees or horse manure, these deposits form a kind of compaction horizon that can interrupt the capillary effect of the sand over the years. This compaction horizon must then be localized and removed. Avoiding this contamination keeps your riding arena permanently functional.
Mineral build up and maintenance of the Ebb- and Flow System
In order to prevent the water in the system from accumulating bacteria, mold, germs and other contamination, we recommend replacing the entire system with water on a regular basis. One or two times a year, preferably in summer, the entire system should be pumped out and refilled with the heavy rain function. This also reduces the formation of odor emissions in the summer months. Because water is a regional element, it can contain different and regionally accumulated minerals.
Lime, iron and other mineral substances can cause discoloration of the sand and deposits in the system. The pumps and sensors in the system are particularly susceptible to these deposits. Cleaning should be done where these minerals are abundant regularly. A failure of the devices or a replacement of these devices due to wear and tear can occur in the long term.
So, the Ebb- and Flow System is more suitable in high precipitation climates where the rainwater which is pumped out constantly is cleaning the sand.