This study was conducted from May 2013 - May 2014. Locations research wasconducted in the District of Bangko Bagansiapiapi. This study aims to determine the qualityof rainwater as a source of public drinking water in the District of Bangko Bagansiapiapi,knowing the health effects of consuming rainwater as drinking water and contribute ideas forthe Government of Rokan Hilir to be able to hold clean water for the people of the District ofBangko Local Government of Rokan Hilir . The results were obtained as follows: (1). Thequality of rainwater in the study site based on the results of laboratory parameters in terms ofinorganic chemistry, physical parameters, chemical parameters still below the drinking waterquality standards that are required by Minister Regulation No. 492 / Menkes / Per / IV / 2010showed that the rain water at the study site that rain water can be consumed by the public andis not harmful to health.

The physical, chemical, and biological properties of peat soil in several levels of fire in Kampar regency. The research was conducted from March to April 2017 in Pelalawan Regency, Riau Province, and Soil Science Laboratory, Faculty of Agriculture, University of Riau. The research was conducted by a survey in the field, determining the sample point using Purposive Sampling Method. The samples were taken from 3 locations ie. the land with heavy, medium and light fire level and control (non-burning/natural forest) 12 units of the experiment. Soil samples were analyzed by the physical and chemical characteristics soil. The results of the physical and chemical characteristics of soil undergoing changes and categorized as broken.

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This study aims to analyze the hydrological characteristics as a result of changes in land use with the help of the SWAT hydrological model and can provide recommendations on the best land use in the Koto Panjang Electric Power catchment area. Based on the results of the analysis using the SWAT hydrological model, it was seen that there were effects of land use changes in 2011 and 2014 on hydrological characteristics; yield of water (WATER YLD) of 2,413.38 mm, and 1.008, 65 mm, runoff coefficient (C) of 0.19 and 0.063 respectively, and river regime coefficient (KRS) of 11.449 and 12.212, respectively. The best land use to be developed in agricultural cultivation areas as a recommendation to maintain water stability in the Koto Panjang hydropower catchment area is a simple and complex agroforestry pattern in scenario III, which is run together with hydrological characteristics in the form; water yield (WATER YLD) of 1,038.41, surface runoff coefficient (C) of 0.023, and river regime coefficient (KRS) of 11.13. The hydrological characteristics in scenario III are far better than 2014 land use characteristics (existing).