REGUA’s Prof. Carlos held a workshop with students
ts from a Cachoeiras de Macacu Secondary School. They were here to find out about the importance of trees to the provision of reliable clean water.
After a short talk, they watched a practical demonstration by Prof. Carlos, showing how when the land is devoid of trees, often compacted, eroded and maybe built upon, the rain runs straight off into the nearby river courses. When the rain is heavy this can lead to flooding, but in any event it takes with it silt and any residual chemicals previously used on the land.
On the other side of our model valley there are trees. Their roots bind the soil, reducing erosion and allowing the surface of the land to accept the rain, filtering it and slowing down the risk of any flooding. After watching as water was poured over both sides of the valley, highlighting the differences, the students went off to see the reforested areas around the wetlands.