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Journal : Civil Engineering Forum Teknik Sipil

KAJIAN POLA-HEMAT PEMBERIAN AIR IRIGASI Nurrochmad, Fatchan
Civil Engineering Forum Teknik Sipil Vol 17, No 2 (2007): MEI 2007
Publisher : Civil Engineering Forum Teknik Sipil

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Abstract

Paddy is a semiaqutic crop that is also adaptic to water lacking condition such as paddy gogo. As common practice in Indonesia, farmers use excessive amount of irrigation water for their paddy field, hoping to yield maximum amount of harvest. Such practice result in the problem of irrigation water supply due to significant amount of irrigation water requirement. However, paddy harvest is actually influenced by the crop variety, water management, soil nutrient availability and land management. A study of irrigation watering pattern is required to obtain irrigation water saving based on the paddy botanical characteristics related to soil nutrient appropriate management in order to gain optimal harvest. This study applied the pattern of irrigation water supply to five plots of 2x3 m2 model consist of 7x11 points, filled with sandy clay soil. The pattern were continuous flooding (PTM), semi flooding – moisturing – semi flooding (SPS), semi flooding - moisturing (SPP), semi flooding – semi moisturing (SPSP) and flooding - moisturing (PP). Three seeds were planted in each point of PTM and PP pattern, and one seed for each of other pattern. Nutrient were given for every paddy plot at the 8th , 25 th and 40 th day of cultivation. Result of this study showed irrigation water used, which did not include land preparation, and harvest under the PTM, SPS, SPP, SPSP and PP pattern were 5385 l and 3,9 kg, 4290 l and 3,9 kg, 4530 l and 4,3 kg , 4265 l and 3,0 kg and 3915 l and 4,9 kg respectively. PP pattern used the least amount of irrigation water but yielded the filler to yield the optimum result, based on the paddy botanical characteristic and appropriate soil nutrient management. It also saved 33,8 % irrigation water in compare to the conventional practice based on the standard stated by the Ministry of Public Works.
STUDI PENANGANAN BENCANA GEMPA DI BANTUL 27 MEI 2006 Didirianti, Desneri; Kironoto, Bambang Agus; Nurrochmad, Fatchan
Civil Engineering Forum Teknik Sipil Vol 17, No 3 (2007): SEPTEMBER 2007
Publisher : Civil Engineering Forum Teknik Sipil

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Abstract

On May 27 th , 2006 at 05:53, 57, a 5,9 Richter scale earthquake occurred. Bantul Regency in Yogyakarta Province was the most severe area. However, existing institutions had limited capability to perform a proper disaster management they also failed to generate the community to participate, especially during the emergency respose period. Therefore, it is required to have an integrated policy for disaster management to meet related parties expectations and to conduct more optimum disaster management. The objective of this study is to obtain best alternatives in handling disaster using the Decission Support System (DSS) eith Analytical Hierarchy Process (AHP) as the method. Three alternatives were analized formatting special office for disaster management (Alternative 1), formatting community based disaster management (Alternative 2), and ascociating the disaster management between interrelated agencies and the local government as the control center (Alternative 3). These alternative were selected based on fuor criterias management, financial, capacity and policy aspect. This study was taken during, the emergency response period performed by SATLAK PBP Bantul. Input for the analysis was questionnaire result given to 120 respondents composing af 30 respondents from bureaucratic element (SATLAK and SATKORLAK PBP members) and 90 respondents from nine villages in three districts. Numeric values were given to each element of the questionnaire result (criterion, sub criterion and alternative). Then, the values were compared to the established comparison scale obtain the lever of interest. Result of this study showed that each criterion of financial, management policy and capacity aspects weighted 0,273, 0,265, and 0,208 respectively. The best alternative of optimum disaster management was alternative 2. The second anf the third were alternative 1 and alternative 3. The community based organizations objective was to improve the people participation in pertaining, preventive, counter measuring and self healing by actively involve in the planning and executing process of disaster management.
KAJIAN PENGELOLAAN AIR IRIGASI BENDUNG PIJENAN Umar, Fauzan; Legono, Djoko; Nurrochmad, Fatchan
Civil Engineering Forum Teknik Sipil Vol 17, No 2 (2007): MEI 2007
Publisher : Civil Engineering Forum Teknik Sipil

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (183.364 KB)

Abstract

Bantul Regency is about 506.85 km2 consists of 16,440 ha paddy fields and 34,245 ha upland fields. The Pijenan weir is one of weirs located in Bedog river in Bantul Regency. The weir provides irrigation water for Jigutan command area (Pijenan Upstream) of 2.074 ha. Kebonongan command area was previously irrigated from Kamijoro free intake in Progo River. The Kamijoro free intake did not properly function properly due to the sediment deposited in 1969. This condition requires supply taken from Pijenan weir. Irrigation water supply taken to Kebonangan command area can be carried out if irrigation water to Jigutan command area has been optimum. Optimally utilized irrigation water for Jigutan command area is necessary based on the crop pattern and crop variety in order to maximize the farmers’ profit. Based on the restitution of irrigation management policy, farmers free to decide which crop variety will be cultivated in accordance to paddy-paddy-palawija pattern. Paddy as the main crop and palawija (corns, beans, peanuts, onion, and chilly) can be cultivated anytime in order to gain the maximum profit based on the available water in Jigutan command area. The optimization analysis of irrigation water allocation for Jigutan command area was performed using the linear program. Water allocation for Jigutan command area of 100% and 50% of available water resulted in optimum cultivation area of 822.88 ha with profit of Rp 7.688.517.507,00 and 612.88 ha with profit of Rp 6.743.877.335,00. The crop intensity with water allocation of 100% and 50% was 278% (197% paddy and 81% palawija) and 207.05% (114.05 paddy and 93% palawija), respectively. These results described that the optimum area of paddy crop cultivation is significantly sensitive to irrigation water allocation compared to the palawija market price. This explains why the profit obtained by the farmers is dependent from the palawija variety. Results of the optimization of irrigation water allocation of 100% and 50% of the available water to Jigutan command area provides annual supply to Kebonongan command area for 155.233.586 m3 and 75.316.444 m3, respectively.