Abstract
One of the popular recharge systems is a recharge well that directly receive rainwater from the roof of the house. In this study, recharge wells will be introduced and analyzed in a modification of conventional drainage. Area for this research was taken in Kimpulan Village, Sleman, Yogyakarta. Input discharge that enters the recharge well used free-flow formula through holes or pipes. The dimensions of recharge wells followed the Sunjoto’s formula, but with T is the time of concentration, not the duration of the dominant rainfall. The result of this study showed that recharge well reduced the maximum discharge and dimensions of the channel. The reduction depends on the diameter of the connecting pipe, the height difference of the water level, depth of groundwater and permeability of the soil in the area. If a diameter pipe of 20 cm and a height difference of 1 m are used, it reduced the runoff discharge more than 17.3%. For the study area, it was not feasible to build additional recharge wells, because it required a large number of wells, approximately 58 pieces, due to very small soil permeability of 3.5.10-5 m/s.
Highlights
The population grows widely cause the need for infrastructure increase in an area, such as the addition of housing, offices, schools, sports buildings, and other buildings
From the result and discussion, it can be concluded that: a. modification of the drainage system with the addition of recharge wells can reduce the maximum discharge of the channel, in other words, there is a reduction in the dimensions of the required channel, b. the reduction of runoff discharge depends on the diameter of the connecting pipe, the design-height difference, the depth of the groundwater level and the permeability of the soil in the area
If a 20 cm diameter pipe is used and a height difference of 1 m, there was a discharge reduction of more than 17.3%, c
Summary
The population grows widely cause the need for infrastructure increase in an area, such as the addition of housing, offices, schools, sports buildings, and other buildings. Because of the increasing building, land use change occurred. The changes in land use be an impermeable area, increase the runoff coefficient, which in turn increase the risk of flooding. The occurrence of floods or puddles greatly disrupt the activities of residents in an area. It will be made a drainage system to overcome that condition. That is a system for removing excess water as quickly as possible, from a drainage channel to the natural river and ending up in the sea. It is known as conventional drainage systems
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