Abstract

The main problem of stormwater runoff is the change of quality of surface runoff due to the decrease of catchment areas and the accumulation of urban residues. As a result, the surface water flow will receive pollutants during its disposal, i.e., mud, logs, leaves, urban industrial waste, etc. This water contamination will vary according to the area in which it through. The types of impurities are physical, chemical, and bacteriological contamination. The development of the horizontal subsurface flow concept in a rain garden system utilizing Purun Tikus (Eleocharis dulcis) plants can be an alternative to resolve the water quality in stormwater runoff. Purun Tikus (E. dulcis) plants in the horizontal subsurface flow-rain garden system reduced the pollutants of Fe and Mn with a percentage reduction of more than 70%. The Purun Tikus plant used in this study also has positive responses, such as surviving and adapting to stormwater runoff conditions with a concentration of 25 ppm Fe and 15 ppm Mn.

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