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Nusantara, Danayanti Azmi Dewi
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Journal : Jurnal Teknik Sipil

 1 
STUDY OF IMPROVING THE IRRIGATION NETWORK SYSTEM FOR THE SALURAN INDUK MADIUN (SIM) IN MAGETAN REGENCY Nusantara, Danayanti Azmi Dewi; Fawati, Isroul Akbar
Jurnal Teknik Sipil Vol 23, No 3 (2023): JURNAL TEKNIK SIPIL EDISI AGUSTUS 2023
Publisher : Fakultas Teknik Universitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/jts.v23i3.68171

Abstract

The Saluran Induk Madiun, abbreviated as SIM, is the primary waterway that irrigates the SIM Irrigation Area. Jati Dam, located in Gondangan Village, Gorang-Gareng District, Magetan Regency, is the primary source of the SIM Irrigation Area. This SIM Irrigation Area gets its main supply from Jati Dam; Jati Dam is the upstream or the beginning of the flow in the SIM Irrigation Area. In conditions before rehabilitation, the Jati Dam had a discharge of 4000 l/s to irrigate the entire SIM Irrigation Area. Especially for the SIM Irrigation Area in Magetan Regency, obtaining water supply from the Jati Dam at 17% of 350,746 l/s, the discharge value can only meet the paddy cropping pattern of 30%. Looking at these problems, the Government of Indonesia is seeking rehabilitation work to increase agricultural barns production. Therefore, it is necessary to research the improvement of irrigation network systems to determine the ratio of water availability before and after rehabilitation, water demand, and the value of increasing agricultural profits. This research uses the F.J. Mock to assess the availability of water discharge FAO Modified Penman Method and the amount of evapotranspiration used to analyze water demand for each cropping pattern. A comparison of the value of the availability and demand for water is presented in the form of a water balance.From the results of the analysis that has been carried out, it is concluded that the highest water availability in the SIM Irrigation Area in Magetan Regency before rehabilitation was 1.37 m3/sec, and the lowest was 0.74 m3/sec. In conditions after rehabilitation, the highest was 5.75 m3/sec, and the lowest was 4.64 m3/sec. It is known that the supply from the Jati Dam, in conditions before rehabilitation, was 17%, and in conditions after rehabilitation, it increased to 28%. The highest irrigation water requirement is the cropping pattern that uses 100% paddy of 3.01 m3/sec. Seeing the value of water availability compared to the still significant water demand, the Jati Dam intake can be reduced from 28% to 20% so that the remaining water can be distributed to the following secondary waterways. Water availability at a percentage of 28% is 5.75 m3/sec; at 20%, it becomes 3.49 m3/sec. This debit can fulfill the highest water demand of 3.01 m3/sec. In conditions before rehabilitation, the availability of water was only able to meet the planting pattern of Paddy (30%) - Paddy (25%) - Secondary crops (100%) with a profit of Rp.26,161,069,519.00. Whereas in conditions after rehabilitation, the availability of water can fulfill the planting pattern of Paddy (100%) - Paddy (100%) - Paddy (100%) with a profit reach up to Rp.115,325,883,740.00.
CALIBRATION ANALYSIS OF RAIN DISCHARGE MODELING IN THE KALIBODO WATERSHED USING HEC-HMS Nusantara, Danayanti Azmi Dewi; Dianeka, Belia Tatika Arno
Jurnal Teknik Sipil Vol 23, No 3 (2023): JURNAL TEKNIK SIPIL EDISI AGUSTUS 2023
Publisher : Fakultas Teknik Universitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/jts.v23i3.67787

Abstract

The Kalibodo sub-watershed is among the Brantas sub-watersheds. The sub-watershed under consideration is situated within the administrative boundaries of Malang Regency. A recurring issue of flooding afflicts the area in question. Floods are influenced by alterations in land utilization, insufficiency of water catchment regions, and elevated precipitation levels. Efforts can be made to address the flooding issue by implementing a hydrological analysis in rain-discharge modeling. The modeling process is conducted using the Hec-HMS software tool. This modeling endeavor aims to acquire hydrological values that closely resemble the observed data. This parameter is a metric for assessing the volume of water flowing through a river. The methodology employed in Soil Conservation Service (SCS) is based on the Curve Number (CN) approach. The method encompasses several parameters: CN, Tlag, Ia, and impervious values. The model calibration process utilizes an input CN value of 77.66 and an impenetrable value of 16.77.Moreover, the analysis of rainfall is conducted using the Thiessen Polygon approach, which considers the influence of rain stations located in Singosari, Sumbergondo, and Karangploso. The present analysis yielded weighting values of 0.457, 0.096, and 0.447 for the Singosari, Sumbergondo, and Karangploso rain stations. The calibration process lost a Nash-Sutcliffe Efficiency (NSE) value of 0.994. Simultaneously, the root mean square error (RMSE) exhibits a value of 0.4. The matter in question is classified as outstanding due to its proximity to an NSE value of 1 and an RMSE value close to 0, indicating a minimal error rate
EVALUATION OF NGABEAN SECONDARY CANAL IRRIGATION NETWORK, NGAWI DISTRICT PART OF SALURAN INDUK MADIUN IRRIGATION AREA Nusantara, Danayanti Azmi Dewi; Hartiningsih, Poppy Fajar Putri
Jurnal Teknik Sipil Vol 24, No 1 (2024): Vol 24, No 1 (2024): JURNAL TEKNIK SIPIL EDISI FEBRUARI 2024
Publisher : Fakultas Teknik Universitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/jts.v24i1.75862

Abstract

The SIM Irrigation Area has an area of 10,860 Ha and a primary canal length of 27,022 m, which passes through the Regencies of Madiun, Magetan, Ngawi, and Madiun City. One of the secondary canals in the D.I SIM is the Ngabean Secondary Canal, located in Ngawi Regency. This canal receives the main water supply from Jati Dam, 25% of the primary dam discharge and water withdrawal from the Ngabean Dam intake of 0.45 m3/ha. However, this value only meets the water needs of some of the irrigation areas. Due to the limited supply from the Jati Bendung, the government is working on rehabilitation work at the Jati Bendung. Apart from that, the Ngabean Secondary Canal also experienced a reduction in the irrigation area from 1840 ha to 1818 ha, to be precise in the NG3 Ki tertiary plot, which had an initial area of 120 ha to 98 ha. Therefore, an evaluation of the Ngabean Secondary Canal is needed to determine the value of water demand, water availability before and after rehabilitation and land reduction, and increasing agricultural profits.From the results of the analysis that has been carried out, it was concluded that the highest dependent flow at Ngabean Dam was 5.00 m3/s, and the lowest was 0.01 m3/s. Meanwhile, in conditions before rehabilitation, the highest dependent flow of Jati Dam was 1.01 m3/s, and the lowest was 0.00 m3/s with water withdrawal at the intake of 25%, able to fulfill the planting pattern of paddy (15%)-crops (75%)-crops (50%) generated a production profit of IDR 8.794.123.880,00. Meanwhile, after rehabilitation, the highest was 5.93 m3/s, and the lowest was 3.21 m3/s with an intake of 32%, able to fulfill the planting pattern of paddy (100%)-paddy (100%)-paddy (100%), resulting in a production profit of IDR 83, 564,115,480.00 with the highest irrigation water requirement value of 3.10 m3/sec. Apart from that, the existing canal dimensions still meet the requirements after land reduction, so no changes to the canal dimensions are required.
Co-Authors abdiyah amudi Amanda Ristriana Pattisinai Anwar, Nadjadji Ardiansyah , Sahrul Romadhon Desy Ratna Arthaningtyas Dianeka, Belia Tatika Arno Fawati, Isroul Akbar Feriza Nadiar Fitri Rohmah Widayanti Hartiningsih, Poppy Fajar Putri Kameswara, Nanda Galuh Lynda Refnitasari Mochamad Firmansyah Sofianto Mochamad Firmansyah Sofianto Mohamad Bagus Ansori Nastasia Festy Marginia Prayogo, Dio Jagat Putra, Alwan Gangsar Brilian RISDIANTO, YOGIE Wulandari, Meity