Modifikasi Penggunaan Data Hujan untuk Pemodelan Hidrologi Hujan Aliran Menggunakan Program IFAS

The advancement of technology in remote sensing sector has provided an alternative solution of data availability in hydrological modeling by satellite data appearance. However, the satellite data still has a weaknesses which is probably caused by several factors such as weather condition and the existence of other objects so that data quality is not good. Therefore, the aim of this research is to model the hydrological rainfall-rainoff with three types of rainfall that are satellite rainfall, ground rainfall and modified rainfall using IFAS program in Rokan Sub Watershed, Riau Province. At the verification phase, advanced and backwards simulation will be done respectively in 2005 and 2006 to test the reliability of the model. The result shows that hydrological modeling at calibration phase in 2006 has a better result in satellite rainfall than that of ground and modified rainfall, with coefficient of correlation (R) value 0,574, volume error (VE) 2,985%, and coefficient of efficiency (CE) 0,876

Pengolahan Air Limbah Domestik Menggunakan Tanaman Alisma Plantago dalam Sistem Lahan Basah Buatan Aliran Bawah Permukaan (SSF - WETLAND)

The rapid growth of the Indonesian population will produce more and more wastewater. Throwing domestic wastewater directly without treatment had caused the water pollution. One of simple, easy, low cost in maintenance and operation technology to decrease the pollutant in wastewater is constructed wetland. This research is aimed to know the efficiency and the best of detention time Subsurface Flow Wetland 2 levels with peat soil media and plant of Alisma plantago in treatment of domestic wastewater. The quality parameters of water that was tested are pH, COD, and TSS. Statistic calculation that was used in this research is Anova (Analysis of variance) of one way. The best efficiency for pH 31.7%, COD 82.1% and TSS 90.3% in variance 4 with time of detention 4 days in reactor 1 and 1 day in reactor 2. The results showed that the constructed wetland 2 levels using peat soil media and plant of Alisma plantago can improve the quality of wastewater

Analisis Dampak Perubahan Tata Guna Lahan DAS Siak Bagian Hulu terhadap Debit Banjir

Historical data discharge in Upper Siak watershed is incrase event caused by the land use change. This study aims to analyze the effect of land use change on the flood discharge in Upper Siak watershed. This Study analyze flood discharge by using HEC-HMS (Hydrologic Engineering Centre-Hydrologic Modelling System) software with input data models in the form of daily rainfall data, land use maps of 2003 and 2012 and soil type maps. The result showed that there is significant changes in land use on land farming with icrease of 28,8 %, meanwhile there is changes in land use on forest with reduction to 34,4 %. Peak flood on 25-year return period incrase to 13,3 m3/s (5.9 %) and peak flood on the 50-year return period incrase of 14,1 m3/s (6.1 %)

Kondisi Tata Air Sungai dalam Pengelolaan Daerah Aliran Sungai di Sub DAS Rokan Kiri

Watersheds management can be evaluated by the criteria of its preservation. The main criteria of watershed`s preservation is the environment goodness which lies on land use, water system, social, economy, and institutions. The criteria of stream system can be scored from several indicators, such as : stream`s regim coefficient, coefficient of variation, water utilization index, and runoff coefficient. This research aimed to find out the classification result from the reviewed parameters on Rokan Kiri Sub Watershed based on rules by Peraturan Direktur Jenderal Rehabilitasi Lahan dan Perhutanan Sosial No. P.04/V-SET/2009. On this research, it has been done the analysis steps and the computation about stream system`s criteria by stream`s discharge indicators. The result of this research has shown that stream system`s condition with indicator of stream`s regim coefficient valued 223,92 which placed on low class, indicator of variation coefficient valued 0,73 which placed on low class, indicator of water usement index scored 0,0035 which placed on well class, and coefficient runoff valued 0,27 which placed on medium class

Efektifitas Backwashing untuk Menjaga Kinerja Rapid Sand Filter di Daerah Gambut

Peat water is water that available on surface or ground water, it has been affected by the characteristic of the peat. These conditions make well water in that area can not be consumed. Water treatment process needs to be done to improve the water quality. One of them with a simple concept and experiencing is rapid sand filter. The purpose of this study was to determine the effectiveness retrospective on the addition of saturated filter backwashing installation. Reactor rapid sand filters without backwashing and rapid sand filter by backwashing made of PVC pipe diameter 6 " and high 50 cm. The results showed rapid sand filters without backwashing produce the best effectiveness to raise the pH value of 7,96 % and lowers the organic content of 29,31 %. While the rapid sand filter by backwashing produce the best effectiveness in raising the pH value of 5,81 % and lowers the organic content of 30,43 %. In general, the processed peat water from rapid sand filter is capable of improving the water quality of the peat