APPLICATION OF GIS AND REMOTE SENSING IN DERIVATION OF CURVE NUMBER FOR SCS MODEL (CASE STUDY: KOTA DAMANSARA, SELANGOR)

摘要

This paper depicts the usefulness of the application of GIS and remote sensing technique in data processing and analysis for an urban catchment. Kota Damansara, Selangor with a total catchment area of approximately 428 hectar is selected for the present study. The major landuse in Kota Damansaara are housing areas and shop lots which contribute impervious areas approximately to half of the catchment area, while the remaining areas are forest, schools, landscape and field. The United States Soil Conservation Service Curve Number (SCS-CN) Method or SCS Model is chosen for rainfall-runoff model. In the present study, remote sensing and GIS are applied to determine weighted curve number for a total of 177 sub-catchments by integrating layers such as landuse, Hydrologic Soil Group (HSG) and delineated catchments. Sensitivity of the Curve Number under different Hydrologic Soil Groups is also tested in the study using InfoWorks Collection System (InfoWorks CS).