Deli River
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The forest area in the headwaters of the Deli is 3,655 hectares, or 7.59 percent of 48 162 hectares of Deli watershed. With an area of 48 162 hectares, length of 73 kilometers (km), and a width of 5.58 m, Deli watershed should have at least 140 hectares, or 30 percent of the watershed.
Today, the river is heavily polluted. 70 percent of waste in the Deli River are solid or liquid waste, due to waste generated in the densely populated city of Medan (reaching 1,725 tons a day).
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Geography
The river flows in the northeastern area of Sumatra with predominantly tropical rainforest climate (designated as Af in the Köppen-Geiger climate classification). The annual average temperature in the area is 24 °C. The warmest month is January, when the average temperature is around 26 °C, and the coldest is December, at 22 °C. The average annual rainfall is 2862 mm. The wettest month is October, with an average of 446 mm rainfall, and the driest is June, with 129 mm rainfall.