Articles

GROUNDWATER IN THE DISTRICT OF WAJO IS STORED IN SIWA-POMPANUA BASIN COVERING AN AREA OF 93,900 HA AND DISCHARGE OF AROUND 379 MILLIONS M3/YR.  THE GROUNDWATER IS UTILIZED TO IRRIGATE RAIN-FED RICE FIELDS PRIVATELY BY FARMERS BY MEANS OF WELLS.  THE DISTANCE BETWEEN WELLS AND PUMPING RATE ARE DESIGNED WITHOUT CONSIDERING THE CHARACTERISTICS OF THE AQUIFER AND ADEQUATE IRRIGATION MANAGEMENT SO THAT DAMAGE IN ENVIRONMENT MIGHT OCCUR AND CONSEQUENTLY FARMING MIGHT NOT BE SUSTAINABLE.  A RESEARCH ., Suhardi; Pawitan, Hidayat; Setiawan, Budi Indra; Waspodo, Roh Santoso B.
Forum Pasca Sarjana Vol. 31 No. 3 (2008): Forum Pascasarjana
Publisher : Forum Pasca Sarjana

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Groundwater in the District of Wajo is stored in Siwa-Pompanua basin covering an area of 93,900 ha and discharge of around 379 millions m3/yr.  The groundwater is utilized to irrigate rain-fed rice fields privately by farmers by means of wells.  The distance between wells and pumping rate are designed without considering the characteristics of the aquifer and adequate irrigation management so that damage in environment might occur and consequently farming might not be sustainable.  A research was conducted with the objectives to study the aquifer characteristics and to develop environmentally friendly groundwater management.  Mathematical models were developed by combining equations of conservation of fluid mass (continuity equations) and Darcy?s law, whereas models of groundwater management were based on crop water requirement and aquifer characteristics.  Test of the model resulted in coefficient of determination equal to 0.848 for the prediction of the drawdown groundwater head.  The result of the model optimization indicated the optimum discharge of each of the wells was different.  One of the wells had a the biggest discharge of 1,268.33 m3/day irrigating 27.58 ha and one other  of the wells had a the smallest discharge of 279.54 m3/day irrigating 6.08 ha of paddy fields based on the irrigation water requirement of 45.99 m3/ha.day.  The reasonable minimum area (ha) determined with equation of power function in x, where x are irrigated hours per season.  For one of planting season/yr, the coefficients of the power (?) equal to 0.0123 and the power functions (?) equal to 0.7247, while for two of planting season/yr with ? equal to 0.0047 and ? equal to 0.8413.   Key words: sustainable groundwater utilization, paddy field irrigation, groundwater management model
MODEL SIMULASI TRANSFER HUJAN-ALIRAN PERMUKAAN (MODEL H2U) UNTUK PENDUGAAN DEBIT DAERAH ALIRAN SUNGAISIMULATION MODEL OF RAINFALL-RUNOFF TRANSFER/H2U MODEL FOR CALCULATE DISCHARGE OF WATERSHED Heryani, Nani; Pawitan, Hidayat; Irianto, Gatot
Agromet Vol. 16 No. 1 & 2 (2002): December 2002
Publisher : PERHIMPI (Indonesian Association of Agricultural Meteorology)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1244.846 KB) | DOI: 10.29244/j.agromet.16.1 & 2.76-87

Abstract

Abstract is available in the full text (pdf format)
THE OBJECTIVE OF THIS RESEARCH IS TO DEVELOP REMOTE SENSING AND GIS TECHNIQUES WITH HYDROLOGICAL APPROACH FOR CRITICAL LAND IDENTIFICATION AND MAPPING. THIS RESEARCH WAS DONE BY WEIGHTING METHOD USING THREE VARIABLES, I.E., SLOPE, RUNOFF CURVE NUMBER AND PERCENT LAND COVER DERIVED FROM DIGITAL AND VISUAL ANALYSIS TECHNIQUES. CRITICAL LAND IDENTIFICATION WAS KNOWN BY INTEGRATING RUNOFF CURVE NUMBER RESULTED FROM COMBINATION OF LAND USE AND HIDROLOGICAL SOIL GROUP, SLOPE AND PERCENT LAND COVER. LA Parsa, I Made; Wiradisastra, Uup S.; Pawitan, Hidayat
Jurnal Manajemen Hutan Tropika Vol. 9 No. 2 (2003)
Publisher : Institut Pertanian Bogor (IPB University)

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The objective of this research is to develop remote sensing and GIS techniques with hydrological approach for critical land identification and mapping. This research was done by weighting method using three variables, i.e., slope, runoff curve number and percent land cover derived from digital and visual analysis techniques. Critical land identification was known by integrating Runoff Curve Number resulted from combination of land use and Hidrological Soil Group, Slope and Percent Land Cover. Land use and Percent Land Cover information were derived from Landsat data, while Hidrological Soil Group results were from 1:50000 soil type map, and slope was from 1;25000 scale of topographic map. Critical land modelling was done using three parameters, slope, runoff Curve Number and percent land cover. This research examined thirteen a, b and c combinations. Mapping accuracy of the model was evaluated using erosion hazard based on USLE formula: A=RKLSCP. The study shows that remote sensing data can be used to produce land use/land cover for curve number prediction and land cover percent as critical land identicication and mapping variables, having accuracy of 62, 59 percent.  
MITIGATION OPTIONS OF GREEN-HOUSE GASES (GHG) FOR AGRICULTURE Makarim, A. Karim; Handoko, I.; Las, Irsal; Yacop, M.; Pawitan, Hidayat; Baharsjah, Justika S.
Agromet Vol. 13 No. 2 (1998): december 1998
Publisher : PERHIMPI (Indonesian Association of Agricultural Meteorology)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1579.337 KB) | DOI: 10.29244/j.agromet.13.2.14-25

Abstract

Abstract is available in the full text (pdf format)
MODEL SIMULASI PRODUKSI KELAPA SAWIT BERDASARKAN KARAKTERISTIK KEKERINGANA SIMULATION MODEL OF OIL PALM PRODUCTION BASED ON DROUGHT CHARACTERISTIC Hasan, Hasril; Pawitan, Hidayat; Boer, Rizaldi; Yahya, Sudirman
Agromet Vol. 13 No. 1 (1998): JUNE 1998
Publisher : PERHIMPI (Indonesian Association of Agricultural Meteorology)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1816.349 KB) | DOI: 10.29244/j.agromet.13.1.41-54

Abstract

Abstract is available in the full text (pdf format)
KINERJA HIDROLIKA SISTEM FERTIGASI MIKRO ., Naswir; Hardjoamidjojo, Soedodo; H. Pandjaitan, Nora; Pawitan, Hidayat
Jurnal Keteknikan Pertanian Vol. 22 No. 1 (2008): Jurnal Keteknikan Pertanian
Publisher : PERTETA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1778.528 KB)

Abstract

A micro fertigation system was designed using local components, simple and easy to build, operate and repair by farmers. Evaluation of hydraulic performances consists oflong-path size in emitters, relationship between discharge and head in emitter, head loss along the lateral, and emission uniformity. The result of the research indicated that the micro fertigation system with 0,5 mm inside diameter micro-tubing used to control the flow from outlets along laterals. The individual microtube was 0,6 m long and spaced at 0,3 m interval along laterals. The discharge was adjusted by stop valves and ranges from 0,48 -2, 74 ltrs/h at operating heads of 0,2-1,5 m. The emission exponent, x was 0,86, and the head-discharge equation was Qe= 1,94 H0,86. The coefficient of manufacturing variation, CV was 0,043 from 125 samples of emitters, and an interpretation of values was excellent. Accordingly allowable length of lateral (at operation head, H = 1 m) 15 meters of length PVC hose ¼ inch size was acceptable and 25 meters of length PVC hose 5/16 inch size was acceptable. The design of micro fertigation system have emission uniformity, EU > 85% far all treatments.  Keywords: micro fertigatian system, hydraulic performance, emission exponent, head loss, emission uniformity Diterima: 6 Agustus 2007; Disetujui: 12 Nopember 2007
TANGGAP FISIOLOGIS TANAMAN JAGUNG DAN KACANG TANAH DALAM SISTEM TUMPANGSARI DI LAHAN BERIKLIM KERINGTHE PHYSIOLOGICAL RESPONSES OF MAIZE PEANUT - INTERCROPPING SYSTEM IN TROPICAL SEMI-ARID DRYLAND Sabaruddin, Laode; Koesmaryono, Yonny; Pawitan, Hidayat; Djoefrie, H.M.H Bintoro
Agromet Vol. 17 No. 1 & 2 (2003): June 2003
Publisher : PERHIMPI (Indonesian Association of Agricultural Meteorology)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1219.752 KB) | DOI: 10.29244/j.agromet.17.1 & 2.21-29

Abstract

Abstract is available in the full text (pdf format)
MODEL PREDIKSI TIGGI MUKA AIR SUNGAI KALI GARANG SEMARANG DENGAN JARINGAN SYARAF TIRUAN Windarto, Joko; Pawitan, Hidayat; Suripin, Suripin; J.P., M. Januar
TEKNIK Volume 29, Nomor 3, Tahun 2008
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (431.278 KB) | DOI: 10.14710/teknik.v29i3.1966

Abstract

One of the big rivers flowing in center of Semarang city is Garang river with watershed area about 220km2 and having characteristic such as big flood discharge and flash flood. Where flash flood on January25th 1990, caused more than 45 people died and goods losses until 8.5 billion rupiahs. One of some modelsto pedict water level is used black box model. Artificial Neural Network one?s of the black bock model . Inthis research, Artificial Neural Network (ANN) with back propagation method is used to predict waterlevel in Garang river where as input are rainfall in upstream of Garang river during two days, while asoutput is water level in downstream of Garang river for two hour later. Result of optimum predicting haveMSE 0.0037 and average of error 1.18 %.
PENGEMBANGAN METODE PREDIKSI PRODUKSI AIR DAS UNTUK SUNGAI-SUNGAI UTAMA DI ACEH Husnan, Husnan; Pawitan, Hidayat; Irianto, Gatot; Laksono, Kukuh Murti; Basri, Hairul
Jurnal Agrista Vol 12, No 3 (2008): Volume 12 Nomor 3 Desember 2008
Publisher : Fakultas Pertanian, Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1293.168 KB)

Abstract

Developing Prediction Method of Watershed for Main Rivers in AcehABSTRACT. The conversion of rural land to urban land usually increases erosion, discharge and volume of storm runoff in watershed. It also causes other problem that effect soil and water. An urban or urbanizing watershed is one in which impervious surface cover or will soon cover a considerable area. Impervious surface includes roads, side walk, parking lots and building. Natural flow paths in the watershed may be replaced or supplemented by paved gutters, storm sewers or other elements of artificial drainage. Hydrologic studies to determine runoff and peak discharge should ideally be base on long-term stationary stream flow records for the area, such records are seldom available for small drainage areas. Even were they are available, accurate statistical analysis of them is usually impossible because of the conversion of land to urban uses during period of record. It therefore is necessary to estimate peak discharge with hydrologic models based on measurable watershed characteristics. Only through understanding of these characteristic and experience in using these models can be make sound judgments on how to alter model parameter to reflect changing watershed conditions.
LONG TERM HYDROLOGIC BALANCE OF THE CITARUM BASIN AND JAVA ISLANDKESEIMBANGAN HIDROLOGI JANGKA PANJANG DAS CITARUM DAN PULAU JAWA Pawitan, Hidayat
Agromet Vol. 16 No. 1 & 2 (2002): December 2002
Publisher : PERHIMPI (Indonesian Association of Agricultural Meteorology)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1471.334 KB) | DOI: 10.29244/j.agromet.16.1 & 2.49-60

Abstract

Abstract is available in the full text (pdf format)
Co-Authors . Soedarsono . SUDARSONO A. Karim Makarim Abdul Rauf Andi Ihwan Arif Kurnia Wijayanto, Arif Kurnia Astried Sunaryani, Astried Bambang Dwi Dasanto Budi Indra Setiawan CECEP KUSMANA Eka Intan Kumala Putri Eni Maftuah Findy Renggono, Findy Fitriani Hayati, Fitriani G. Gravenhorst Gatot Irianto H. Soewardjo H.M.H Bintoro Djoefrie Hairul Basri Hakim, Patria Rachman Hasril Hasan Husnan Husnan I Made Parsa I Nengah Surati Jaya I Wayan Nurjaya I. Handoko Ika Purnamasari Irsal Las Iwan Ridwansyah Jarwadi Purwanto, Mohamad Yanuar Joko Windarto Justika S. Baharsjah K. Murtilaksono Kasdi Subagyono Kiyoshi Honda Kukuh Murti Laksono Kukuh Murtilaksono Kusumo Nugroho Laode Sabaruddin Latief Mahir Rachman Latifah, Arnida Lailatul Lilik Budi Prasetyo Liyantono, Liyantono Lukman H. Sibuea M Yanuar J. Purwanto, M Yanuar M. Januar J.P. M. Yacop M. Yanuar J. Purwanto M. Yanuar J. Purwanto May Parlindungan, May Moch. Anwar Mohammad Yanuar Jarwadi Purwanto Muh. Taufik Muhammad Ardiansyah Muhammad Arsyad Mulia Purba Naik Sinukaban Nani Heryani Naswir . Ngudiantoro . Ngudiantoro Ngudiantoro Nono Sutrisno Nora H. Pandjaitan Nora H. Pandjaitan Paston Sidauruk Prita Ayu Permatasari, Prita Ayu Purwana Satriyo Rahmat Hidayat Ridwansyah, Iwan Rizaldi Boer Rizatus Shofiyati Robianto H. Susanto, Robianto Robiyanto H. Susanto Robo, Sarif Roh Santoso B. Waspodo Rokhmin Dahuri S. Arsyad Sakka Sakka Soedodo Hardjoamidjojo SUDIRMAN YAHYA Suhardi . Suria Darma Tarigan Suripin Suripin Sutapa, Ignasius Dwi Atmana Suyamto, Desi Syafrudin, A Hadi Syarifuddin Karama SYARTINILIA SYARTINILIA, SYARTINILIA TANIA JUNE Trihono Kadri U.S WIRADISASTRA Uup S. Wiradisastra Vincentius P. Siregar Yanuar J Purwanto Yayat Hidayat Yonny Koesmaryono Yudi Setiawan Yustika S. Baharsyah