Please Just Try to Submit This RUNOFF DISCHARGE ANALYSIS USING THE SNYDER METHOD, MANGKALAPI, TANAH BUMBU, SOUTH KALIMANTANSample Abstract
Tedy Agung Cahyadi (a) Muhammad Naufal Asadillah (a) Peter Eka Rosadi (a) Indun Titisariwati (a) Wawong Dwi Ratminah (a)

a) Universitas Pembangunan Nasional ^Veteran^ Yogyakarta
Jl. Padjajaran Jl. Ring Road Utara No.104, Ngropoh, Condongcatur, Kec. Depok, Kabupaten Sleman, Daerah Istimewa Yogyakarta 55283

Abstract

This research was conducted in Mangkalapi Village, Kusan Hulu Subdistrict, Tanah Bumbu Regency, South Kalimantan which is occupied by many mining companies. The mining system used by all mining companies at the research location are open pit mining so that it is affected by runoff water. High rainfall can affect and even hinder open pit mining operations and can cause the formation of large basins that have the potential to become water storage areas, both from runoff water (Gautama, 1999). During extreme weather conditions in the form of high rainfall, water from surface runoff can inundate the pit bottom and cause muddy mining fronts, resulting in losses for the company. Because of this, runoff water discharge is very important to study in flood forecasting. The hydrological method used to analyze runoff water discharge is the Snyder method. In this research, the research area is divided into five areas or Catchment Area (CA). Based on the calculation of flood discharge using the Snyder method at the research location, the runoff water discharge at CA1 is 2.516 m3/sec, CA2 is 2.88 m3/sec, CA3 is 1,339 m3/sec, CA4 is 1,527 m3/sec, and CA5 is 2,954 m3/sec. The time required to reach the flood peak at CA1 is 1,01 hours, CA2 is 1,09 hours, CA3 is 1,07 hours, CA4 is 0,92 hours, and CA5 is 1,10 hours.

Keywords: runoff- Snyder method- flood discharge

Topic: Hydrology, hydrogeology, and geology engineering