News Further Toolbox Content About Check Dams and Sand Dams Now Available in German! Posted 20. October 202020. October 2020 RUVIVAL Team This post is also available in: Deutsch (German)As of today, the RUVIVAL Toolbox content about check dams and sand dams can also be viewed in German on the HOOU page, good luck with learning! Check Dams are one erosion control measure. Sand Dams retain rainwater and recharge groundwater.