Abstract
Quantity and quality of water is needed along with the increase of population, the increasing change of agricultural land function and tourism development in Bali. This means that the need for domestic and non-domestic water will also increase, thus research on water quality in river estuary, water resources for water and land conservation in Gianyar regency of Bali province is indispensable for sustainability of water supply in terms of water quantity and quality, river area, and water management and land allotment in accordance with existing watershed conditions in Gianyar regency of Bali province in order to reduce land conversion change (Gianyar in figures 2010-2015) and village nomography. Raw Water Distribution (SPAB) in the downstream of Petanu river with SWOT analysis beginning to be managed by indigenous society and based environment. Research method used is quantitative research. This research used primary data in the form of water quality and water quantity data in downstream of Petanu River, population in coastal area of Gianyar Regency, topography data, bathymetry in coastal area of Gianyar Regency, and environmental condition of downstream of Petanu river. The downstream water potential streaming is designed using WATERNET software which is then applied to the Raw Water Flow System in the downstream area of the Petanu river which will be managed by indigenous villagers. The results of this study resulted in water quality at the mouth of the river for odor, color, taste, temperature, turbidity, pH and detergent meet quality standards, while salinity, BOD and COD as well as total coliform does not meet the quality standard, class I. The simulation result from WATERNET shows that the discharge of the river amounted to 20 million m3/year can be utilized for industrial water (hotel) 1,636 rooms, for domestic water 98,181 inhabitant, for 2.33 ha pool water managed by indigenous villagers for the coastal society of Saba Gianyar Regency.
Highlights
The province of Bali has 401 rivers where 162 rivers runs into the ocean
The downstream water potential streaming is designed using WATERNET software which is applied to the Raw Water Flow System in the downstream area of the Petanu river which will be managed by indigenous villagers
The simulation result from WATERNET shows that the discharge of the river amounted to 20 million m3/year can be utilized for industrial water 1,636 rooms, for domestic water 98,181 inhabitant, for 2.33 ha pool water managed by indigenous villagers for the coastal society of Saba Gianyar Regency
Summary
The province of Bali has 401 rivers where 162 rivers runs into the ocean. The characteristics of existing rivers are mostly intermittent and annual rivers so that the utilization of water sources from these rivers cannot be expected throughout the year. Less than 11% of rivers have flow rates during the dry season. According to [1] of potential rivers in Bali amounted to 66 rivers. One of them is Petanu River in Gianyar Regency. Water is very important and very necessary for the needs of irrigation/agriculture and for the daily life of the society and can support tourism activities in Bali Province [2]
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