Various infrastructure in Saudi Arabia are affecting by floods and rainfall that may damage construction at urban areas within its zone because the water flows in main valleys and streams. Jizan-Abha Highway recently affected by flood outflow risks that cause lost in properties, people, and infrastructure along with sunk the most of the near urban settlements. This study presents a proposal of new methods to assess expected flood risks that impacted the infrastructure projects by simulate Jizan-Abha Highway modeling case. The model will be based on the integration between hydrological and hydraulic modeling. It will develop a classification map of the flood risk impacted areas along the Jizan-Abha Highway, and settled the solution maps with suggested and proper alternatives to scram those flood risks. The study based on applying the WMS program to draw valleys and outflow basins and compute their morpho metric attributes.