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<br />l <br />I <br /> <br />Rock .,nd Brush Revetment <br /> <br />Rock and brush mat revetments can be used to control stream bank E,rosion in <br />most areas where rock riprap can be used. There are two conditions when t"is <br />practice would not be recommended. The first is on a sharp curve. The second <br />is on reaches with large flows and a high velocity. The bank is !:loped back <br />to a slope not steeper than 1.5 horizontal to 1 vertical. ~ rock toe is <br />placed at the bottom of the slope to protect the bank from undercutting. <br />Brush is then laid with the butt ends up the slope and transverse to the <br />stream bank. The brush is anchored in place with wire and stakes, If the mat <br />does not extend to the top of the bank, the unprotected area shoul.d be seeded, <br /> <br />A variation to this practice is to use all bundled brush or willows. <br />would not be recommended on channels with high flow velocities. The <br />would replace the rock in the toe and bottom part of the slope. <br /> <br />This <br />brush <br /> <br />1 <br />; <br />~ <br /> <br />It is recommended to use live brush for the above practices. If live brush is <br />used. loose dirt should be placed over or around the bundled brush. This will <br />enable more of the brush to sprout faster and form vegetative protection for <br />the bank. <br /> <br />These practices should be maintained by inspecting the wire anchors and the <br />rock toe. Any wires which have been pulled loose should be repaired. 3rush <br />or rock which has been dislodged should be replaced. <br /> <br />i <br />, <br />i <br />, <br /> <br />~ <br />~ <br />1 <br />I <br /> <br />70 <br /> <br />~ <br />~ <br />