Articles

Found 1 Documents
Search
Journal : Indonesian Journal of Geography

a deterministic model for predicting water yield from two different watersheds Sudira, Putu
Indonesian Journal of Geography Vol 37, No 1 (2005): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (71.575 KB)

Abstract

This study was conducted in Pogung-Code sub watershed and Pulo-Opak sub watershed from 1993 to 2002. A deterministic model developed by Haan (1972) was used to determine the amount of water yield from watersheds. The model consists offour parameters, namely: (0 maximum rate of seepage from the soil water zone in mm per day (S), (ii) maximum soil moisture less readily available for evapotranspiration in mm (C), (iii)fraction ofseepage from the soil water zone that becomes runoff(F), and (iv) maximum infiltration rate in mm per hour (f.).The inputs required by the model were the daily rainfall and the estimated potential evapotranspiration which was computed using Penman method. Streamflow records for 10 years of Pogung-Code sub watershed (2,801.77 ha) and Pulo-Opak sub watershed (4,856.37 ha) were used to test the validity of the model. The parameters obtained for Pogung-Code sub watershed were: S = 0.70 mm per day, C = 112.32 mm, F = 0.63, and- 5.38 mm per hour, meanwhile for Pulo-Opak sub watershed were: S = 2.33 mm per day, C = 86.72 mm, F --- 0.26 and f = 5.68 mm per hour.The final test of the adequacy of the model lay in a comparison of observed and simulated runoff The comparison showed that the observed and simulated runoff values are not significantly different. This was based on the results obtained from statistical measures to test the model. The model did a better simulation in the smaller watershed (Pogung-Code sub watershed) than in the larger one (Pulo-Opak sub watershed).
Co-Authors Abdulloh Hamid Agung B. Supangat Agung Budi Supangat Ahmad Fathoni Arief, Sigit Supadmo Azwar Maas Bambang Hendro Sunarminto Benito Heru Purwanto Budiadi Budiadi Didik Indradewa Dja’far Shiddiq, Dja’far Dja’far Shiddiq Dwidjono Hadi Darwanto Dwijono Hadi Darwanto Dwiki Muda Yulanto, Dwiki Muda E.K., Jonathan Edy Purnomo Elly Kurniawati Erniati . Erniati Erniati Erny Poedjirahajoe Erwanto, Andes Haryono Supriyo I WAYAN WINDIA J.A., Bambang JAKA WIDADA Judy Kurniawan Kumalajati, Erlynda Lano, Marten Luter Lilik Sutiarso Linda Setiawati, Linda Lolo, Yatwawan Lukman Hidayat M Mawardi Macalino, Moses T. Mardawilis . Muhamad Arpan, Muhamad Muhjidin Mawardi MULYONO, NITISAPTO Murtiningrum Murtiningrum Nikodemus P.P.E. Nainiti, Nikodemus P.P.E. Nining Wahyuningrum Nitisapto, Mulyono Nopriyanti Nopriyanti, Nopriyanti Nurlaili, Meli NYOMAN SUTAWAN P., Bambang Hari Pardjono Pardjono Pramudya Dwi Aristya, Pramudya Dwi Purwadi, Tri Purwanto, Benito Hadi Rachmad Jayadi Ridwan . Ridwan Ridwan Riyawan Susanto, Riyawan Rustan Massinai Sabarnudi, Sambas Sahid Susanto Saiful Rochdyanto, Saiful Sambas Sabarnurdin Sapto Wibowo Sewoko, Andri SIGIT SUPADMO ARIF SIGIT SUPADMO ARIF Sigit Supadmo, Sigit Siti Mazizatuz Zahroh Siti Mechram Siti Nurul Aini, Siti Nurul Soenarto Soenarto Sri Suryanti Sudjarwadi, Sudjarwadi Suharyono Suharyono Sukirno Sukirno Sukresno . Sukresno Sukresno Sumiyati . SUMIYATI SUMIYATI Sunarwanto, Sunarwanto SUPRODJO PUSPOSUTARDJO Totok Gunawan Wardan Suyanto WAYAN WINDIA Winna Dharmayanti Wisnu Wardana, Wisnu Yowanita Dwi Irwanti