Taylor Engineering conducted a pilot study for the Texas General Land Office, integrating inland watershed models (HEC-RAS) with coastal hydrodynamic models (ADCIRC and STWAVE) to address the complex challenge of coastal flooding in Texas. The study focused on the Dickson Bayou watershed, employing innovative techniques such as Rain-on-Mesh analysis, and expanded hydraulic modeling into Galveston Bay. The primary challenge addressed was the interplay of multiple flood drivers, including storm surge, river discharge, and extreme rainfall events during storms. The ability to simulate historical storms and incorporate new bi-variate joint rainfall-surge pairings enhances the accuracy of flood predictions, potentially leading to more efficient allocation of resources for flood prevention and response. The study’s goal was to aid in the identification of cost-effective flood mitigation strategies for counties and municipalities, reducing the financial burden of flood damage in coastal Texas communities.