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Saiful Rochdyanto

Fakultas Teknologi Pertanian, Universitas Gadjah Mada

Author-ID : 2871457

Agriculture, Biological Sciences & Forestry

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Nilai Air dalam Hubungannya dengan Pendapatan Usaha Tani Saiful Rochdyanto
agriTECH Vol 7, No 1 (1987)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Distribusi Kecepatan Aliran di Saluran Terbuka Pada Permukaan Saluran Bergelombang Saiful Rochdyanto
agriTECH Vol 12, No 3 (1992)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Study on velocity distribution in wavy bed was conducted in a 10 m long, 0.5 m wide, 0.4 m depth glass-walled rectangular open channel. Flow characteristic was measured by hot wire anemometer and data was transferred to personal computer by digitizer. The Reynolds number which calculated from the maximum velocity are 3940,5630, 8190, and 12,930 respectively. Result of study shows that velocity data can not be approached by using the logarithmic law Mean while the power-law velocity distribution seems applicable in explaining the scanered velocity data. The velocity reduction about 0.21u/um in the area close to the bed and 0.05 u/um In the middle of turbulent boundary layer is disadvantage in the view point of hydraulic structure operation

Pengukuran Kecepatan Aliran Bermuatan Sedimen di Saluran Irigasi Saiful Rochdyanto
agriTECH Vol 14, No 2 (1994)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Study on the measurement of flow velocity in sediment-laden flow was carried out in Van Der Wig* irrigation Canal, Yogyakarta. Study was conducted in various of canal conditions and various of sediment concentration. Flow velocity was measured by using current meter and water sample was collected by using suspended sampler. Result of study shows that velocity distribution data can be suited by the power-law, although it does not seem to fit with equation that presented by Munson which is suitable with non-sediment laden flow in open channels. Due to the deviation on power-law graph, in order to find the average-measured-velocity which is match with the actual-velocity, the point of measurement should be 0,71 D (from the free water surface). The point of measurement at 0,6 J) such as already established by regulation will give an error about 14,35%.

Kinerja Alat Pencurah Sederhana Pada Sistem Irigasi Curah (Sprinkler Irrigation System) Saiful Rochdyanto; Sigit Supadmo Arif; Isti Susilawati
agriTECH Vol 17, No 2 (1997)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

The modification of fabricated sprinkler which is available in the market was done in order to solve several problems, such as : the performance is unsatisfied, the prize is relatively high, the construction is complicated, and the operation and maintenance is not too easy. The performance testing was carried out to six model of modification sprinklers, they were : Sl, S2, S3, S4, S5, and S6, and then compared with fabricated sprinkler (SP). Sprinklers were tested with several parameters, such as : water discharge, throw distance, water distribution pattern, water rate, and particle water diameter. Result of experiment showed that S5 gives the best performance. This model has upper arm length = 5.0 cm, lower arm length = 3.8 cm, nozzle angle in upper arm = 65Â°, nozzle angle in lower arm = 40°, the number of nozzle in each lower arm and top of arm is one. Comparing with fabricated sprinkler (SP), the prize of S5 model is relatively cheap. It is Rp. 5,575.00 for S5 and Rp. 17,500.00 for SP. Due to the construction is relatively simple and the product material is very easy to find in local market, so the model S5 can be introduced and developed to farmers in order to increase their agricultural production.

Pengembangan Model Operasi Pompa Berkelanjutan di Daerah Irigasi Sumur Pompa Dangkal Murtiningrum Murtiningrum; Sigit Supadmo Arif; Saiful Rochdyanto
agriTECH Vol 16, No 1 (1996)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Model of sustainable pump operation in an unconfined groundwater irrigation system was developed to determine pump operation pattern which consist of the number of pumps, duration, and distance between pumps, so that crop water requirement is fulfilled and groundwater irrigation system is sustained. Total irrigation flow, EQpi, results in lowering water table which is called drawdown, sn. Drawdown sn should be less than di (sn< di) which (d1 is maximum drawdown which is affected by pump technology. Model outputs for the area of Sri Rahayu Farmer Group in Kedungtuban, Blora for existing cropping pattern show that average irrigation water requirement is 916.1mm/year and peak flow is 4.93 ips. It still can be fulfilled by 1, 2, 3, 4, or 9 pumps for 10 days operation continuously which is shown by the drawdowns which are less than maximum drawdown.

Co-Authors Isti Susilawati Murtiningrum Murtiningrum SIGIT SUPADMO ARIF

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