Optimization Of Recharge Well Functions In The Campus Complex Of Uny Yogyakarta

The prevalent floods happened in Yogyakarta suburbs is not decreasing but growing every year. The same thing also happens in the campus complex of Yogyakarta State University (UNY) and its surroundings. Some parts of the campus and its surroundings having an area of 56,58 hectares are often flooded...

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Bibliographic Details
Published in:IOP conference series. Earth and environmental science 2019-06, Vol.271 (1), p.12002
Main Author: Purwantara, S.
Format: Article
Language:English
Subjects:
Artificial recharge
Concrete
Concrete construction
Drainage channels
Hydrologic data
Mathematical analysis
Open spaces
Optimization
Permeability
Rain
Rain water
Rainfall
Recharge areas
Recharge wells
Satellite imagery
Satellites
Suburban areas
Suburbs
Water wells
Well data
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Summary:The prevalent floods happened in Yogyakarta suburbs is not decreasing but growing every year. The same thing also happens in the campus complex of Yogyakarta State University (UNY) and its surroundings. Some parts of the campus and its surroundings having an area of 56,58 hectares are often flooded when rains occur with somewhat high intensity. This happens because the amount of run-off and drainage channels is imbalance. Also, many the recharge area spaces are diminishing since they have been converted into buildings. How large is the recharge area existing in the complex of UNY? How much is the volume of rainwater that is accommodated in this campus complex? How many recharge wells are needed?.This research aims at investigating the built-up areas and open spaces, rain water volume prediction, and the estimation of the optimal number of recharge wells needed. This research utilizes the rainfall data, built-up area data gathered using satellite imagery, infiltration data, permeability, and the number of recharge well data. The amount of discharge and the estimated volume of rainwater are calculated using a rational method Q = C.I.A. Based on the volume of rainwater, the method can be used to predict the number of recharge wells needed. To determine the depth of recharge wells, the DPU formula H = D.I.At - D.K.As / As + D.K.P is employed. The results show that the recharge area is only 37,80%.Thisnumber is quite small since a lot of space of land that is supposed to be a strategic open space such as parking lot or garden has been converted into concrete and cement construction. The maximum of the rainfall volume at 50 mm / hour is around 28,290 m3. Therefore, based on the calculation, 3,519 units of artificial recharge wells are needed. In fact, the recharge wells built by the campus are only 128 units.
ISSN:1755-1307
1755-1315
DOI:10.1088/1755-1315/271/1/012002