EVALUATION OF WATER BALANCE IN MICRO CATCHMENT (CASE STUDY: SUB CIDURIAN WATERSHED, CITARUM HULU)

• Main Author: Ardian, Siti
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/37125
• Institution: Institut Teknologi Bandung

Bandung Regency has a population of 8 million (2014) and is expected to increase to 10 million in 2030. At present some areas in Bandung Regency increase air shortages. This was done in several regions, the population sought to procure tear and air-based clean water. The second source is naturally limited so that sustainability is the key to meeting needs. Examples of some unsustainable water sources, for example in the Cidurian sub-watershed, Cimenyan sub-district. In this study the boundaries of the watershed area, where the area of pulley in the study study was 4.22 km2 or 422 ha. The purpose of this study was to analyze and improve the efficiency of water balance in the Cidurian Cimenyan Bandung watershed, social and economic, water quality in the Cidurian Cimenyan watershed in Bandung. This study uses primary and secondary data. Where, the primary data is by conducting surveys & interviews directly with the population as well as measuring the rain, measuring the flow of flow and measuring the quality of river water at the study site. 1 piece Propeller C2 current meter and 1 Range finder, a water pass and a simple rain gauge. Observation results of this study The highest rainfall was 62.28 mm / day, with the average rainfall during the 9-day rainy season in Cidurian Sub Das which was 14.79 mm / day. Observations for 12 days in the dry season showed that the air discharge in the Cidurian watershed decided between 0.055 m3 / s - 0.067 m3 / s in the dry season with an average discharge of 0.060 m3 / s. Observations for 9 days during the rainy season in Cidurian Sub-watershed, the value of air discharge in the Cidurian sub-watershed varied in the wet season between 0.45 to 3.29 m3 / s with an average discharge of 1,229 m3 / s. For the debit value to get the value of the coefficient of determination (R2) of = 0.9909, this value indicates that it is strong, while the variation of discharge (Q) can be continued by the water level (TMA). Based on the analysis of the questionnaire in getting water requirements in the assessment area of about 104 liters / person / day. The water deficit in one year in the study location area of the Cidurian watershed is 40,820 m3 / year. The Tank Model Optimization Results obtained 14 parameters to apply the hydrological characteristics in the Cidurian sub-watershed with a minimum depth of the base tank which is an interbasin aquifer which affects the base flow (haq) of 0.24 mm. Lower tank discharge coefficient (A1) 0.02 mm, upper tank reinforcement coefficient (A0) 0.02 mm, tank discharge coefficient between B1 0.02 mm,: percolation coefficient of tank tank B0 0.01 (mm), Underground tank discharge coefficient (C1) 0.01,: Underground tank percolation coefficient (C0) 0.001 mm, base tank allocation coefficient (D1) 0.1 mm, upper tank release position (dA2) 1 mm, tank discharge position more low (dA1) 0.1 mm, intermediate tank release position (dB1) 1 mm, position of underground tank release (dC1) 1 mm, Rainfall Correction (rfcf) of 0.9 mm.