Volume Calculation of the Rain Runoff and Domestic Waste Water in Sawojajar Village in Malang, Indonesia

Abstract

Basically some of the rain falling to the ground level will seep into the soil and the rest will flow to become surface runoff. Depending on the condition of the area when the water flows both the pervasive and flowing into the drainage. The characteristics of the regions that affect the rain water section are topography, soil type, and land use or land cover. The method of discussion uses quantitative and qualitative analysis. The quantitative analysis used in this research is a series of calculation process which ultimately aims to obtain the volume of water runoff and the volume of domestic wastewater produced by each catchment area and will enter to the collector drain. While for qualitative analysis is in form of effort to interpret data and result of calculation in order to reach a conclusion of research. Based on result of analysis done hence obtained by conclusion that high/low of water usage in study location also influenced by socioeconomic condition of resident and kind of land allotment in a region. The difference in the volume of clean water use further causes the difference in the volume of domestic wastewater. It is also known that the amount of domestic wastewater produced by each catchment area is 1% to 5% of the total water calculated will enter to the drain, while the rest comes from the rainwater runoff.

Keywords: surface flow, domestic wastewater, water runoff