Water Security for Cities depends on their use of the river basin as a planning unit. This requires cooperation between stakeholders across the basin, implementing programs to reduce vulnerability and risks upstream and downstream. Cities can play a leadership role in driving investments in their watershed combined with urban projects that protect and recover water resources, through integrating urban drainage, sewage infrastructure, reestablishing vegetation coverage and water sensitive design in the urbanization of surrounding settlements. All these measures – adding up to progressive improvements – can increase water security and become key risk prevention strategies to address water quality, water scarcity and extreme events such as floods and droughts.