Overview of River over Drainage Channels in the Wailela River Watershed, Teluk Ambon District, Ambon City

Drainage is a sewer system that functions to drain rainwater runoff, sewage from settlements, factories, industrial wastewater, prevent stagnant water and so on. Thus, if there is stagnant water or runoff in an area, the condition of the local drainage channel needs to be evaluated. Stagnant water that is not immediately drained can cause negative impacts such as disruption to residents' activities, the environment becomes dirty, smells bad, and causes disease. Analysis and discussion of rainfall calculations for 10 years with rational methods based on algebraic mean, Gumbell, Log person III. The purpose of this study is to analyze how much runoff discharge, dirty water discharge discharge and rehabilitate existing drainage channels and drainage runoff handling solutions. By analyzing the rainfall discharge that occurs in the field using return periods of 1.01 years, 2 years, 5 years and 10 years, the peak hours that occur in the drainage area are obtained. For the 0.01 year return period it is 345.597 mm/hour, for the 2 year return period it is 435.094 mm/hour, for the 5 year return period it is 477.044 mm/hour, and for the 10 year return period it is 511.195 mm/hour. The amount of discharge / discharge of dirty water in channel Ka1 = 0.0037 m3/s, for channel Ka 1a = 0.0059 m3/s, for channel Ka 1b = 0.0060 m^3/s, for channel Ka 2 = 0.0058 m^3/ sec , for Ka 2a channel = 0.0039 m3/s, for Ka 2b channel = 0.0034 m3/s, for Ki 3 channel = 0.0056 m3/s, for Ki 3a channel = 0.0010 m3/s, for Ki 3b channel = 0.0012 m3/ sec