Population growth is increasing, but it is not accompanied by an increase in food needs impartial. Indonesian swamp land potential of about 33.4 million ha, consisting of tidal swamp 20.1 million ha and 13.3 million ha of lowland swamp. The Government has made the development of swamps into agricultural land, including the Semangga swamp area (4,000 ha) The cropping pattern of rice (100%)-crops (40%)-"bero". The problem faced are; the length is 7-month of dry season and low agricultural production, are therefore likely to swamp irrigation system optimalization. The method used to carry out water balance analysis and performance assessment of irrigation system include; the physical condition of irrigation, the application of the system of planting and water delivery techniques to the use of land for a year, then performed according to the potential land development plan and water resources available. Results of water balance analysis on Semangga Swamp Area existing condition indicate that water deficit occurred during the second growing season crops (May-July) and in December. So do the appropriate development plan defined cropping pattern III, namely rice (100%)-crops (60%)-crops (45%) with the addition of a total area of 1,000 ha through the use Kumbe River and Maro River and other water reservoirs to overcome deficits in the availability of water in the dry season that is equal to 2.5m³/s (April to August and October to December), while 6.5m³/s in September, 72.40% irrigation system performance with good category.
Rockfill dams have better stability than homogeneous soil dams. It allows to design the dam more slim with a higher slope. The disadvantage of rockfill dam is in the core zone as an impermeable zone. Zoned vertical core rockfill dam is a combination of various material properties. Geometry and drainage design will affect the seepage and phreatic line properties that occur. Numerical modeling and calculations are used to calculate the seepage profile more accurately. The combination of the parameters of the permeability coefficient (K), reservoir water level (Δh) and the length of the seepage path (L) can be used to determine the relationship between parameters with the same unit. 2D modeling take into account saturated/unsaturated conditions with steady state on each parameter. This study uses the Jatibarang-Indonesia dam as a basic model. The seepage profile at condition K1 (k = 1x10-5cm/sec) is q/k = -0.0018 (h2/L)2 + 1.3496h2/L + 53.241 and the seepage profile K2 (k=1x10-7cm/s) is q/k = -0.1521 (h2/L)2 + 90.402h2/L + 5480.2. This equations can be used to estimate seepage that occurs in a dam of other rock fill zoned vertical core dam based on the permeability coefficient value (K) more practically for all values of Δh and L reviewed.Keywords: Seepage, Rockfill Dam, Permeability, FEM, Numerical Analysis
The Telaga Kenyamukan as a raw source of Kudungga WTP is studied to determine the water availability. Historical data used in hydrological analysis are sometimes incomplete or have a short time period, so the results may not match the conditions in the field. Hydrological analysis in this study used rainfall data from Pit-J and AB Station from 2005 to 2016, and climatology data from the Sepinggan Meteorological Station from 2005 to 2016. The discharge was analyzed by Mock method, then generated up to year of 2038 with the Thomas-Fiering method and obtained the dependable flow with the monthly basic method in a 90% probability, resulting in 467l/sec. The water requirements are calculated by projecting the population for the next 20 years, with the results of the RWC (Regional Water Company) total water demand in 2019 amounting to 259.99 l/sec and increasing up to 2038 to 630.32 l/sec. With a water balance analysis, the water availability in the next 20 years in meeting needs is in a surplus condition, but in RWC water supply systems which depend on Water Treatment Plant capacity, since 2028 the WTP capacity must be increased due to a deficit of -12.57 l/sec.
The design of rainwater harvesting is planned for alternative water source in Universitas Diponegoro area and hopefully it can reduce the use of groundwater as the main source water to fill the demand of water in Universitas Diponegoro Tembalang area. The use of groundwater to fill the water demand in Universitas Diponegoro Campus for years 2014/2015 of 2.23 lt/dt it more than the optimum discharge are allowable to take the water wells is equal to 0.2-1 lt/dt. Based on that the planning of the rainwater harvesting building is made of with a volume of 245 m 3 with a dimensions of 7m x 7m x 5m and dimensions of infiltration wells with a diameter of 1.5 and depth of 3m. Planning of the rain water harvesting in the Universitas Diponegoro Tembalang area the cost of Rp 275,465,000,-with the process of work for 29 days.
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