From rainwater harvesting to tree nurseries, communities in Medellín are taking steps to increase their landslide and flooding resilience From rainwater harvesting to tree nurseries, communities in Medellín are taking steps to increase their landslide and flooding resilience I n his home on a steep hillside in the neighbourhood of Golondrinas in Medellín, Róbinson Velásquez Cartagena stands proudly next to two large tanks of water – a rainwater harvesting system he designed and built to help