Offbeat

I've never seen the red bellied blacksnake in OP but I have battled copperheads and rattle snakes on our property.

There's a number of things that can repel snakes in the short term. I find pretty good success with packets of strong smelling stuff like clove oil and peppermint oil.

Long term, we have to co-exist with nature, so I try to make it generally less hospitable in areas where there is more likely to be kids or pets playing. I reduce clutter and remove debris from the areas I trim, etc.

I also teach my kids not to reach into anything with their hand if they can't see what is there. Iirc, the most deadly snake bites are in a hand or wrist. Dont be dumb. Look before you reach in. Or better yet, use a stick instead.

Learn how to survive a snake bite. Treatment time matters a lot, here. If in the field, I would use a sharpie to circle the bite location and write the time. Or take a picture. Remove clothing that could constrict the limb when it swells, even if you have to cut it off. Elevate the limb and get to a hospital immediately.

https://wildsafe.org/resources/ask-the-experts/venomous-snakebites/