Riversand vs. Silica: The Science Behind a Safer and Better Ride
- sean69722
- Feb 17
- 3 min read
The Old School vs. The New Standard
For decades in South Africa, "riversand" was the default answer when someone asked what to put in their arena. It was readily available, relatively cheap, and it was just "what everyone used."
But equestrian sports have evolved. We are asking more of our horses athletically—higher jumps, tighter turns, and more complex dressage movements. Just as saddle fitting and nutrition have become sciences, so has arena construction.
At Harrogate Equestrian, we frequently get called out to fix arenas that riders describe as "riding on the beach." The culprit is almost always the same: deep, unstable riversand. Here is why we advocate for Silica sand as the superior, modern choice—backed by science.
The Problem with Riversand: "Riding in Quicksand"
The biggest issue with traditional riversand is the shape of the particle. Riversand particles are naturally eroded by water, making them round and smooth.
Imagine trying to stack a pile of marbles. They slide off one another. When a horse lands a jump or pushes off for a canter stride on riversand, those round particles roll away from the hoof.
The "Deep" Factor: Because the particles roll, the surface offers no resistance. The horse’s hoof sinks deep into the footing to find stability.
Tendon Strain: This lack of stability forces the horse to work much harder to pull their leg out of the surface, putting immense strain on tendons and ligaments.
Inconsistency: Riversand is a dredged product. One truckload might be coarse, and the next full of silt. This leads to arenas that are dusty in summer and rock-hard mud pies in winter.
The Science of Grip: Why Cohesion Matters
It’s not just about a "firm" feeling vs. a "deep" feeling. There is genuine physics at play here. In engineering terms, we are talking about Shear Strength.
According to extensive research, including the FEI Equine Surfaces White Paper, the ideal surface must minimize Shear Failure. This occurs when the footing is too loose (like deep riversand), causing the foot to slide excessively during propulsion or landing.
1. Cohesiveness Through "Micro-Interlocking"
Research in the Journal of Equine Veterinary Science highlights that surface stability is largely determined by particle shape. Riversand is round; under the microscope, it looks like ball bearings. It has a low "angle of internal friction," meaning it wants to slide.
Our Silica is sub-angular. When compacted, these jagged grains don't just sit next to each other; they interlock. This creates a cohesive "mat" of sand. When a horse lands a 1.40m jump, the surface absorbs the energy through this structure rather than displacing (flying away).
2. The Role of Moisture (Capillary Action)
You’ve likely noticed that dry riversand is loose, while wet riversand is heavy. Silica behaves differently. Because of the consistent grain size, water creates a bridge between particles (capillary tension).
This moisture-binding capacity allows us to "tune" the grip. A properly watered silica arena provides what biomechanists call "high shear resistance." This means when the hind leg pushes off for a gallop or a piaffe, the hoof stays put. The energy goes into forward motion, not into digging a hole.
3. Preventing the Injury Slide
Veterinary studies often point to the toe-grab phase of the stride as a critical moment for injury. In deep, non-cohesive sand, the toe rotates too far into the ground (hyperextension of the fetlock).
Because Silica is cohesive, it supports the hoof immediately upon landing. It allows for a controlled amount of slide (to absorb shock) but then quickly "locks up" to provide a solid platform for the next stride. This significantly reduces the load on the Deep Digital Flexor Tendon (DDFT) and suspensory ligaments.
The Harrogate Verdict
We believe that building an arena is an investment in your horse's soundness. While riversand might seem like the cost-effective option upfront, the veterinary bills for suspensory injuries and the frustration of a deep, heavy surface often cost far more in the long run.
We build strictly with high-grade silica because we know it provides the safety, consistency, and performance that modern riders—and their horses—deserve.
Thinking of upgrading your current surface or building a new arena from scratch?
Contact Harrogate Equestrian today for a consultation. Let’s get you on the right footing.
Sean Rabitte Harrogate Equestrian 068 211 0412 www.harrogateequestrian.co.za
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