This is an illustration that shows the design of the three-log drain waterflow device.

At the top of this illustration is a drawing that shows the "plan view" of the device, with the existing channel of the affected waterway marked by dotted lines through a "Swamped Area." A three-log drain is placed through the beaver dam to allow water to pass from the swamped area through the existing water channel that has been blocked by the beaver dam.

Below the Plan view is a detailed drawing labeled as an "oblique profile." The three-log drain device is constructed with three 6-inch to 9-inch diameter green or water logged poles, each 10 feet to 16 feet long. A piece of roofing tin is placed on top of the three-pole structure, and a forked stake is installed on the upstream end to hold the waterflow device in place. The roofing tin has been perforated with axe blade holes.

The bottom drawing depicts the end view of the three-log drain device. It shows the three logs held together by roofing tin and 1-inch to 2-inch green sticks laced between one pole on top and two poles underneath.

This drawing was provided by the U.S. Department of Agriculture Soil Conservation Service. The device was designed by D.H. Arner, and revised by D.H. Arner.