Lematang Riveris the longest riverin the province ofSouthSumatra, with a length of159kmand theflowarea of7340km²watershed. Natural resourcesare veryabundantminesinLahat.Materialsproduction centersandsandquarryin thevillageLower Market.Purposeof this studywas to determinehow bigthe impact ofmining activitiesthat affectchanges incross-sectional area, allowing theimpact ontheriverflow. From the analysis resultsobtainedcalculationdischargethe past 10 yearsmining130,01m³/sec, debitwithoutmining130,01m³/secanda flow rate of1.030m/sec.
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