This course provides an understanding of the history of drainage development in a particular area, especially in Indonesia. Definition, aims and objectives of drainage, network patterns and determining channel dimensions, hydrological analysis, regional rainfall (rainfall), Rain Intensity Curve, Practical ways to process rain intensity in forecasting flood discharge, watersheds, runoff, estimating peak flow rates and use of rational methods, use of the hydrograph method (HSS), flood prediction hydrographs, condition of the city of Surabaya, geographical position, topography, hydrology and land use, drainage system patterns, gravity flow, pump stations and average rainfall, special drainage, drainage , planning steps and use of planning criteria, technical flow aspects, basic hydraulic planning, basic concepts, conversion laws, flow, specific energy, depth of stable channel planning patterns, in-buildings in drainage and pump systems.