This paper describes the methodology and results of a hydrologic analysis implemented by the World Resources Institute (WRI) as part of the International Coral Reef Action Network (ICRAN) Mesoamerican Reef (MAR) partnership. The objective of the analysis was to quantify the impact of human alteration of the landscape on land-based threats to the MAR to inform land-use planning, agricultural policy and practice, conservation priority setting, and risk mitigation efforts.











