When using a foothold trap for beaver, experienced beaver trappers make what we call a positive drowning set. To make a positive drowning set with a foothold trap, you must secure a heavy-gauge wire out into deep water and use a one-way drowning lock to attach the trap chain to this wire. When a trapped beaver impulsively dives, it goes down the wire into deeper water, and the lock prevents it from coming back up. When done correctly, the beaver quickly dies.
The most important consideration is choosing a location to set where the water is deep enough to drown a beaver. This water must be at least three-feet deep. The deeper the better off you will be.
A weight of at least 30 pounds should be attached to the deep-water end to secure the slide wire. Sometimes the wire must be longer than several feet to reach deep-enough water. The shallow end of the wire is attached to a stake on the bank.
Sufficient weight to anchor the slide wire can be a hassle to obtain, especially when operating some distance from your vehicle. Carrying cement blocks or chunks of scrap iron is time consuming and exhaustive.