DETERMINATION ON VISCOSITY VALUE OF RIVER FLOW AS THE POTENTIAL INDICATORS FOR FLASH FLOOD - CASE STUDY IN SADDANG RIVER

Recent global climate change has turned out to have an impact on the accumulation of high rainfall in a short time. Flash flood is a short flood occurrence in about 6 hours which is caused by rain with very high intensity. This study aims to analyze the value of viscosity as an indication of the potential for flash flood. The form of this research is survey research. This research was conducted in 3 locations on the Saddang River, namely Saddang River upstream (Buntu Batu River), Saddang River middlestream (Mata Allo River) and Saddang River downstream (Pekkabata River). The type of test material for measuring viscosity is a bad load sample measuring 2 - 10 cm in diameter and releasing material that is attached to the bad load and then put it in a measuring cup filled with water. Then testing the digital viscometer. Test material for measuring turbidity is in the form of River water samples taken at each point of the study site using 3 tubes with different turbidity levels and measured using a turbidity meter (turbiditymeter AMT 21). Based on the relationship between turbidity parameters, velocity and discharge temperature indicate the viscosity value increase from 97.5 MPa.second (97,500 kg/mm.second) to 203 MPa.second (203,000 kg/mm.second) as an indication of the potential for flash floods in the Saddang River.