Compound hydro-sedimentary hazards are often screened by overlaying flood and erosion indicators without explicitly separating sediment source, transfer pathway, and downstream receptor processes. This study develops a source-pathway-receptor geospatial framework for a 2,337.76 km² coastal basin using a 10 m DEM, hydrologically conditioned D8 routing, distributed travel time, SCS-CN runoff transformation, HAND-TWI flood susceptibility, RUSLE soil-loss estimation, and structural sediment connectivity. The spatial concentration time was 28.17 h, only 2.9% above the 27.37 h regional benchmark. The historical 100-year peak discharge of 1,700.2 m³/s increased to 1,884.5 and 2,210.2 m³/s under +8% and +22% rainfall stress tests. Mean potential soil loss was 68.75 t ha⁻¹ yr⁻¹, with 39.20% of the basin exceeding 50 t ha⁻¹ yr⁻¹. High and Very High compound-hazard classes occupied 33.71% historically and expanded to 44.11% and 61.98% under the two stress scenarios. The methodological contribution is the explicit linkage of erosion source magnitude, sediment-transfer connectivity, and flood-prone receptor terrain using fixed scenario-independent thresholds, while concentration time is independently checked against regional evidence. The framework therefore supports comparable climate-stress screening and infrastructure prioritization without presenting susceptibility as deterministic hydraulic inundation.