Drainage in peatland caused reducing water storage and subsidence. Groundwaterlevel fluctuations are a major role in the water balance that occurs in peatlands. Theresearch was conducted in a specific area of agricultural peatland. The location inSub-Peatland Hydrological Unit (Sub- PHU) 5 and 6 Kahayan Sebangau, CentralKalimantan Province, Indonesia. Modeling for groundwater table was applied usingFreewat / Modflow software with input rainfall probability 80% (R80), infiltration,and evapotranspiration data analysis. Groundwater table should not be less thanminus 0.4 meters based on the Indonesian Ministry of Environment and Forestry(Menlhk). The deficit means the groundwater level below -0.4 m and surplus uponthe criteria. Land modeling is simulated with an area of 300 x 1000 meters. Thecalibration in the model was found conductivity values, 50 m / day or 5.78 x 10-4 m /s with the best value with the largest NSE and Correlation. The modeling showedthat the deficit occurred in seven months. The groundwater management is how tokeep the water level upon -0.4 m with the planning of canal blocking height. Thescenarios are 0.2 m. 0.3 m, 0.4m, and 0.5 m upon the base flow of the canal. Thebest scenario was chosen 0.5m according to the simulation which has the waterlevel upon -0.4 m.
High population growth in the area of East Jakarta has led to more construction of settlements, including in several areas of East Jakarta, which includes Jalan Pengantin Ali in Ciracas Sub-District. When very heavy rains fall in the rainy season, this place is often flooded, while in the dry season there is a scarcity of raw water or clean water. This study examines the application of sustainable drainage systems with the technique of making a retention pond as a flood control alternative. The purpose is to hold water runoff during the rainy season so that it does not enter the river directly, and so that some of the collected water could be used to meet the clean water supply needs of the people. The calculation of rainwater potential used the height of the monthly average rainfall. The retention pond capacity was determined by the pool simulation method during the rainy season. The planned flood discharge was calculated using the Nakayasu HSS method. The obtained results indicated a peak discharge value with a return period of 2 years that amounted to 8.84 m3/sec. The planned retention pond area is 6380.94 m2, with a retention pond height of 4 m, a dike slope of 1:1, and the elevation of the overflow base being at an altitude of 38.5 meters above sea level (masl). From the results of the HEC-RAS 5.0.6 software, an optimal overflow width of 2 m was obtained, with an outflow discharge of 4.55 m3/sec and a pond volume of 19530 m3. With the retention pond, flood peak discharge could be reduced by 4.29 m3/sec. This will allow the flood discharge in the rainy season to be reduced and increased clean water needs in the dry season to be met.
Lubang Biopori adalah lubang yang dibuat khusus untuk mengembangkan biopori di dalam tanah. Biopori adalah lubang-lubang kecil dalam tanah yang membantu tanah bernafas (mengalirkan oksigen) dan menyediakan/meresapkan air hingga ke dalam. Lubang biopori adalah bentuk artifisial dari akar tanaman, khususnya akar bambu yang memiliki beberapa kelebihan dengan kemampuannya dalam menyerap nitrogen dan karbon serta banyaknya mikroorganisme di sekitar ujung akar bambu yang berperan aktif membentuk biopori. Dengan banyaknya biopori, kemampuan menyerap air dalam tanah menjadi lebih besar disbanding tanah asli, dari penelitian yang dilakukan di lahan berkontur dan berjenis tanah silt yang dilakukan dengan metode observasional analitik diperoleh bahwa, pada masa observasi 4 bulan, penambahan lubang biopori dan penanaman bambu sama-sama meningkatkan koefisien resapan tanah hingga 3 kalinya. Dalam masa penerapan 1 tahun, penambahan lubang biopori meningkatkan koefisien resapan tanah hingga 8 kalinya dan penanaman bambu akan meningkatkan koefisien resapan hingga 60 kalinya.
The rapid population growth has made residential land more widespread. causing the surface water runoff getting bigger and coupled with the narrowing of the river cross-section by sediment so that the river’s capacity is no longer able to accommodate the existing flood discharge. This study aims to reduce the risk of flooding in the Cisangkuy river. Modeling was carried out using HEC-RAS 2D. Modeling results in the existing conditions show that water has flowed into the residential area. Handling in the form of normalization of the Cisangkuy River as an appropriate alternative for reducing flood risk. After normalization, there was a decrease in the water level in the upper reaches of the Cisangkuy river from an altitude of 672.13 masl to 667.85 masl and in the middle of the Cisangkuy river it fell + 3.3 meters. which was originally from an altitude of 668.57 masl to 665.21 masl. The improvement of the Cisangkuy River has had a significant impact on the flow of the Cisangkuy tributary and the urban drainage system around the area. So that the Cisangkuy River can accommodate the discharge and the risk of urban flooding can be reduced. With this risk reduction, flooding that has an impact on the social, economic, and health sectors can be controlled and can be focused on future urban problems.
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