Abstract
Land use changes in a watershed will affect to net rainfall and have an impact to river discharge. Evaluation of plant interception due to land use changes would had better view of net rainfall. The descriptive research is aims to determine changes in land use that affect net rainfall and reliable discharge using the Nreca calculation model. The area of the Miu watershed was 654. 55 km2 and the changes in land use was considered the years of 2005, 2010 and 2016 which is observed by using ArcGIS software to evaluate the catchments area. The land use changes show the forest area decrease from 82. 10% in 2005 to 78. 65 and 89. 67% for 2010 and 2016, but there has been a lot of increase in open area from 1. 71% in 2005 to 8. 19% in 2016. Net rainfall was applied in calculation of dependable discharge and the results obtained show the flow consistency. The input parameter for initial SMS is 200 mm, PSUB is 0. 85 and GWF is 0. 25. The average discharge obtained is 9. 15 m3/sec. The graph shows very close relationship between net rainfall that influencing to dependable discharge.
Highlights
The river's flow is highly dependent on climatology and soil conditions and the vegetation that supports the retention of water
Input is needed from the model of rain - runoff are as follows; The average rainfall (P); Potential evapotranspiration (PET); The capacity of the storage moisture (NOM); PSUB; GWF; The initial value of the storage soil moisture (SMSTOR); The initial value of the ground water reservoir (GWSTOR); and Crop factor (Cf)
From the analysis Dependable Discharge of the Nreca method, the biggest discharge value is 29.00 m3/sec occurred in December 2012, and the smallest discharge is 1.26 m3/sec occurred in April 2012
Summary
The river's flow is highly dependent on climatology and soil conditions and the vegetation that supports the retention of water. Land use changes as well as an increase in temperature will have a direct impact on the flow of the river and debit. Human exploitation of land within the watershed is based on human needs for plantation and agricultural land. Uncontrolled land needs cause watershed conditions physically and environmentally to decline. One of the phenomena of decreasing watershed conditions is land use change caused by land conversion. By the increasing change in land use in the watershed, a study is needed to determine the impact of changes in land use on dependable discharge
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