This study was undertaken to test methods by which a representative basin could be used to develop a synthetic unit hydrograph for an ungauged basin within its hydrological region. Three synthetic hydrograph methods were tested in two hydrological regions using three basins in each region. The methods tested were: (1) a modified Snyder method, (2) Commons' dimensionless hydrograph, and (3) Soil Conservation Service dimensionless hydrograph.