The Grogol River (Kali Grogol) is a small river in the western part of the Special Capital Region of Jakarta, Indonesia.[1][2] The lower portions of the original river have been channelized with levees built along its banks,[3][4] but flooding remains a real concern.[4][5]Illegal buildings built along its banks were removed in 2014,[6] and fifty-eight village families were provided with replacement housing, but most of them could not be accommodated.[7]
The Grogol River has a length of 23.45 kilometres (14.57 mi), with the watershed area (Indonesian: Daerah Pengaliran Sungai) of 32.08 km2.[10] The average daily rainfall is 144 mm, with the peak flow rate at 290 m³ per second.[10]
Geography
The river flows in the northwest area of Java with predominantly tropical rainforest climate (designated as Af in the Köppen–Geiger climate classification).[11] The annual average temperature in the area is 27 °C. The warmest month is March, when the average temperature is around 30 °C, and the coldest is May, at 26 °C.[12] The average annual rainfall is 3674 mm. The wettest month is December, with an average of 456 mm rainfall, and the driest is September, with 87 mm rainfall.[13]