A Proposal Design of Stone-Pitched Retaining Wall as a Countermeasure for Soil Erosion in San Agustin Creek, San Agustin, San Fernando, Pampanga

Tropical storms and typhoons frequently hit San Fernando, the capital of Pampanga in thePhilippines, due to its varied topography. This study centers on San Agustin Creek in San Fernando, anarea that is highly vulnerable to erosion and slope instability. To stabilize slopes and blend in with thesurrounding environment, a stone-pitched retaining wall is the proposed solution. The wall's flexibilityallows for soil movement and lowers the possibility of structural damage to neighboring properties. Theinterlocking stones increase the wall's resilience against heavy rainfall. Survey showed that there is anongoing erosion problems and property damage experienced by the residents. Hydrological (HEC-HMS)and hydraulic (HEC-RAS) modeling were utilized in this study to comprehend the behavior of the creekand direct the design of the retaining wall. Despite having a lower Nash-Sutcliffe Efficiency (NSE) score,the results of the hydrologic modeling showed a "Very Good" Percent Bias (PBIAS) — indicating reliabledata input for hydraulic analysis. The hydraulic modeling showed how retaining walls can lessen areasthat are vulnerable to flooding, which in turn lowers the risk of property damage. The structure was drawnand examined using AutoCAD and GeoStudio. To guarantee adherence to safety standards, the studyfollowed the National Structural Code of the Philippines (NSCP) 2015 and the guidelines set forth by theAmerican Concrete Institute (ACI). The study's comprehensive approach to addressing erosion challengesin San Agustin Creek was strengthened by the stability analysis, in which factors like sliding resistance,overturning, and breakwater were considered.