The role of Sentani Lake in order to maintain The Environments in Jayapura
sapari (1), Nofdi J Rampi (2)

1.Civil Engineering of Hasanuddin University
2.Dinas Pekerjaan Umum Tata Ruang, Perumahan dan Kawasan Permukiman Kota Jayapura, Papua

Abstract

Sentani Lake is one of the lakes that has a lot of potential in natural resources. This potential such as a source of clean water, for transportation, fisheries, irrigation and for tourism if managed properly can give benefit for the society around the lake. Sentani Lake is located in Jayapura Regency, Papua Province.
This lake is under the slopes of the Cyclops Nature Reserve with range of approximately 245,000 hectares. Sentani Lake is located in the southern city of Sentani which is the capital of Jayapura Regency. This area reaches 9360 ha with a storage capacity estimated at 2,716 m3. Sentani Lake receives water from 14 large and small rivers that culminate in the mountain Cyclops and then draining to the Pacific Ocean and flowing out through Jaifuri River. Total area for watersheds about 517 km2 with an average rainfall of 1.691mm per year, so the availability of water in a year reaches 404m3 / sec. Sentani Lake is a lake with hilly islands in the middle of the lake and it has a height of 70 - 90m above sea level.
On the other hand the existing site of Sentani Lake has started to experience ecological threats due to environmental degradation. Various problems that arise include flooding, erosion and high environmental pollution due to domestic waste, livestock and industry that all flow into Sentani Lake.
Based on land slope map, Sentani Lake area has a moderate slope of 17-52% that allows sedimentation because of erosion process in the region. This can lead to flooding due to sediment build up and rising waters of Sentani Lake. This situation needs an integrated handling from upstream to downstream so that the environmental impact of flooding can be minimized. Sentani Lake can be maintained by improving aspects of hydrology, land use aspects, as well as improvements in environmental aspects such as spatial arrangement in accordance with the carrying capacity.
This article will focus on studying the prevention of natural disaster such as flood, erosion and environmental pollution. This study will also try to analyze factors that caused the degradation of Sentani Lake. Moreover, the actions plans that need to be conducted to maintain Sentani Lake will be analyzed such as revitalization in hydrology aspect, land use, and land planning base on carrying capacity of Sentani Lake.

Keywords: Sentani Lake, Environmental Impact, hydrology, land use, spatial planning and carrying capacity.

Topic: Infrastructure and Environment