IDENTIFIKASI BENCANA BANJIR KELURAHAN TLOGOSARI KECAMATAN PEDURUNGAN KOTA SEMARANG

ABSTRAK Bencana banjir di Kota Semarang sudah tak asing lagi bagi masyarakat Semarang, khususnya pada wilayah timur Kota Semarang, bencana banjir di Kota Semarang disebabkan beberapa faktor antara lain curah hujan yang tinggi, permukaan tanah yang lebih rendah dibandingkan permukaan air laut, dan banyaknya sampah yang tersumbat pada saluran drainase. Bencana banjir yang disebabkan oleh beberapa faktor tersebut berdampak buruk bagi Kota Semarang khususnya pada Kelurahan Tlogosari, Kecamatan Pedurungan, dampak dari bencana banjir tersebut mengakibatkan kerusakan pada jalan, kemacetan, dan dapat menyebabkan penyakit pada lingkungan di wilayah deliniasi di Kelurahan Tlogosari, Kecamatan Pedurungan. Perlu adanya penanganan untuk mengatasi bencana banjir di wilayah deliniasi Kelurahan Tlogosari, Kecamatan Pedurungan, seperti upaya melakukan pembangunan sistem pengendali banjir dan pada sistem drainase, dan pembangunan sumur resapan air pada setiap permukiman, serta melakukan konservasi secara berkala untuk sungai maupun sistem drainase di wilayah deliniasi Kelurahan Tlogosari, Kecamatan Pedurungan. Kata Kunci : Identifikasi; Banjir; Tlogosari ABSTRACT The flood disaster in Semarang City is familiar to the people of Semarang, especially in the eastern area of Semarang City, the flood disaster in Semarang City is caused by several factors, including high rainfall, lower land surface than sea level, and the amount of clogged garbage. on the drainage channel. The flood disaster caused by several of these factors had a bad impact on the city of Semarang, especially in Tlogosari Village, Pedurungan District, the impact of the flood disaster caused damage to roads, congestion, and could cause disease in the environment in the delineation area in Tlogosari Village, Pedurungan District. There is a need for handling to overcome flood disasters in the delineation area of Tlogosari Village, Pedurungan District, such as efforts to build a flood control system and drainage system, and build water infiltration wells in each settlement, as well as carry out periodic conservation of rivers and drainage systems in the delineation area. Tlogosari Village, Pedurungan District.Keyword: Identification;Flood; Tlogosari

KEVEOKI 1: Exploring the Hiri ceramics trade at a short-lived village site near the Vailala River, Papua New Guinea

Investigations at the newly discovered, once-coastal but now inland archaeological village site of Keveoki 1 allows us to characterise the nature and antiquity of ancestral hiri trade ceramics around 450-500 cal BP in the recipient Vailala River- Kea Kea villages of the Gulf Province of the southern coast of Papua New Guinea. This paper reports on the decorated ceramics from Keveoki 1, where a drainage channel cut in 2004 revealed a short-lived village site with a rich, stratified ceramic assemblage. It represents a rare account of the ceramic assemblage from a short duration village on a relic beach ridge in southern Papua New Guinea, and contributes to ongoing attempts to refine ceramic sequences in the recipient (western) end of the hiri system of longdistance maritime trade. Because of the presence of a single occupational period of a few decades at most, short duration sites such as Keveoki 1 allow for chronological refinement of ceramic conventions in a way that multilevel sites usually cannot, owing to the lack of stratigraphic mixing between chronologically separate ceramic assemblages in the former.

NUMERICAL METHOD APPROACH TO ANALYSIS OF DRAINAGE CHANNELS OF PIT-3 WEST BANKO TANJUNG ENIM

The drainage network system should be designed to accommodate normal flow rates, especially during the rainy season. This means that the capacity of the drainage channel has been calculated to accommodate the water discharge that occurs so that the area in question does not experience puddles or the channel can to be function properly. For this reason, research is needed to analyze the ability of the ex-coal mine drainage channel in PIT-3 West Banko Tanjung Enim. The research was carried out with the help of the HEC-RAS software program to see the changes in the water level in the drainage channel where the water was overflowing from the channel body. The results showed that all the section profiles of the drainage channel (P1) till (P10) were still in the safe condition or the channel was still stable (stable channel).

Development of an Open Channel That Also Functions as a Wetland to Reduce Domestic Wastewater

Besides accommodating rainfall-runoff, the drainage channel of the Dukuh Menanggal area in Surabaya also accommodates domestic wastewater. The objective of developing the function is to degrade domestic wastewater pollution that flows into the drainage channel. The wetland is applied in the drainage channel with coarse sand media, Caladium (Caladium), and Water lettuce (Pistia stratiotes L) plant according to land size planning based on existing discharge, detention time, the porosity of the planting medium, and the root zone of the applied plants. The observed properties of domestic wastewater were Chemical Oxygen Demand (COD), Biological Oxygen Demand (BOD), and detergents. The result is that the treatment of domestic wastewater passes through the artificial wetland in the drainage channel. The constructed wetland can reduce the contamination content of domestic wastewater for the parameters of BOD, COD, and detergents with efficiency levels of 46%, 61.8%, and 69%, respectively.

Effectiveness Of Boezem As A Zero Runoff In Blimbing Subdistric, Malang

During the rainy season, inundation often occurs in Blimbing Hamlet, Malang, which caused by inadequate existing drains and lack of utilization in water catchment buildings. Therefore it is necessary to accommodate this condition using zero runoff concept, by utilizing boezem, which is expected there is no inundation at all by flowing flow immediately either seeping into the ground or into an artificial landfill. In Blimbing Hamlet, there is a boezem for serving and accommodating rainwater. For overcoming inundation in this area, maximalizing the boezem is significantly essential. This research is aimed to know the effectiveness of boezem for zero runoff. This assessment was done by hydrology analysis to obtain Q2, and Q5, for boezem planning, inlet outlets gate, and new drainage channels. The evaluation for existing drainage system showed there was inundation in some drainage channels. A boezem area of 836.9 m2 with 1.1 m depth can reduce inundation to 10%. Alternative inundation countermeasures are carried out with the added depth of 3 m, floodgates on inlets and outlets with of 0.5 m width steel gate, and drainage channel inlets and outlets. With the rehabilitation of boezem and other complementary buildings, it can reduce inundation by 30%.

Assessment of the level of drainage services in Damai settlement area (Ampal River Watershed), Balikpapan, Indonesia

Flood is a major disaster in Balikpapan City. One of the locations experiencing high flooding is in the Damai settlement area (Ampal River Watershed), especially in Mayor Polisi Zainal Arifin Street. One of the causes of this flood-prone area is the suboptimal drainage conditions. This study aimed to assess the drainage services in the Damai settlement area (Ampal River Watershed), of Mayor Polisi Zainal Arifin Street to observe the drainage services and overcome flood problems. Achieving such goals was done by analyzing the service level of the drainage channel by using the scoring and weighting method. The scoring and weighting method produced classifications of drainage services in the Damai settlement area (Ampal River Watershed) on Mayor Polisi Zainal Arifin Street, namely, medium and bad drainage services. There is segment 2 channel 2A, segment 3 channel 3A, segment 4 channel 4A, and segment 5 on channel 5A and 5B classified as having bad service level and there are 13 channels classified as having moderate service levels.

Hydraulic analysis of Semarang River in supporting the drainage channel as water tourism

The Semarang River is a flushing channel located in the Semarang River Drainage Sub-System and has the potential to be used as a water tourism area with the concept of Historical River Front City Walk. The planned water tourism area is in the form of procuring boats in the Kota Lama area, which is a historic area in the city of Semarang. This analysis aims to hydrology and hydraulics model of the Semarang River using SWMM 5.1. The method is carried out by observing the existing conditions of the study area, determination of flood discharge plans, and hydraulic analysis. The analysis starts from the Simongan Weir Bridge upstream of the Semarang River to the Berok 2 Bridge, which is located in the Kota Lama area. The results showed the intensity of rainfall designed 25 years is 155.7 mm/hour with the capacity of the Semarang River in existing and planning conditions can still accommodate the flood discharge plan, and a weir with a height of 1 m is needed to maintain the water level in boundary condition so that boat tours can operate optimally.

Study of Flood-Prone Areas in Bekasi Regency

Bekasi Regency is a potential area economically because there is the largest industrial area in Southeast Asia. However, Bekasi experiences the threat of flooding every year. The growth of the Bekasi Regency area has been affected by the growth of the Jakarta area, even becoming part of the JABODETABEK Metropolitan area (Jakarta-Bogor-Depok-Tangerang-Bekasi. This shows a potential location for economic growth in Bekasi Regency. Bekasi Regency is a West Java Province Region and is hydrologically included in the Regional Unit River (SWS) from the Citarum River Basin. The purpose of this study is to describe flood-prone areas in Bekasi Regency. The research method uses data collection methods by means of surveys and field observations. The data obtained are primary and secondary data, analyzed using ARCH GIS assistance to map flood-prone areas and their inundation and drainage channel conditions. The study findings will provide lessons on flood cases in Bekasi Regency. Flood cases that can provide knowledge related to cases of coastal areas and cases of areas that have high economic potential.

Analisa sumur resapan untuk mereduksi limpasan permukaan pada Perumahan Hang Tuah Cipta Residence Pekanbaru

Changes in land use, namely from cultivated land to closed land or settlements, make the water demand in the area increase, if the water that comes out is not balanced with the water that enters the ground, it will cause a decrease in the ground water level. Another problem that arises due to changes in land use is runoff, where runoff occurs due to rainfall exceeding the suction power or infiltration of the soil, so that over time the runoff becomes a puddle and can even cause flooding. One way to overcome these problems is to apply infiltration wells. This case study takes place in the Hang Tuah Cipta Residence Housing Area, Pekanbaru. From the results of field research and Hydrological data analysis revealed that the main existing drainage channel discharge with a discharge capacity of 0.923 m³/s is unable to accommodate the discharge that occurs at 1.19 m³/s. Segment or secondary drainage channels Q12 and Q13 are also unable to accommodate the discharge that occurs at 0.085 m³/s with a capacity of 0.06 m³/s. Based on the analysis results it is planned that the infiltration well with a radius of 0.5 m and a depth of 9 m which has a capacity of 0.0022 m³/s. After the planned discharge infiltration well comes out to be 0.88 m³/s, it means that the discharge does not exceed drainage capacity of 0.923m³/s.

INTERAKSI SOSIAL ANTARA WARGA PERMUKIMAN REAL ESTAT DENGAN PENDUDUK DI SEKITAR NYA

The Bonana settlement is located in Cilandak sub-district, Lebak Bulus village. Built on an area of 38 hectares, it is the result of the conversion of gardens and swamps owned by residents who currently still live in the villages around the settlement. In general, those who work in the Bonana Settlement, live in the villages around the Bonana settlement. The Bonana settlement is equipped with public and social facilities. The Bonana settlement is equipped with green open spaces, in the form of gardens, tennis courts, and green open spaces along the main drainage channel. Green open space equipped with a children's play area (playground), basketball and badminton courts and mosque worship facilities. The facilities in the Bonana Settlement are also used by residents around the Bonana Settlement. Within the Settlement, the formal economic facilities built by the developer are shops with banking facilities, household needs, medical needs, and places to eat, in addition there is an informal market that sells daily necessities. This informal market was formed by the trading community. In general, settlements built by developers are generally closed to the surrounding community, as a preventive measure against crime, but the Bonana Settlement is open between residents of the settlement and the surrounding community. The purpose of the study was to determine the form of participation of the residents of the Bonana Settlement to maintain the security and comfort of their settlements. The study used a qualitative approach with data collection by interviews and observations, and by using sources. The study obtained the participation of residents of the Bonana Settlement to make a safe and comfortable settlement. Keywords: Community; Social Interaction; Green Open Space; Public Open Space AbstrakPermukiman Bonana, berlokasi di Kecamatan Cilandak, kelurahan Lebak Bulus. Dibangun pada lahan seluas 38 Ha, merupakan hasil konversi kebun dan rawa milik penduduk yang saat ini sebagian masih mendiami perkampungan di sekitar Permukiman tersebut. Pada umumnya mereka yang bekerja di Permukiman Bonana, bertempat tinggal di perkampungan disekitar permukiman Bonana. Permukiman Bonana dilengkapi dengan fasilitas umum dan sosial. Permukiman Bonana di lengkapi dengan Ruang Terbuka Hijau, berupa taman, lapangan tenis, dan ruang terbuka hijau sepanjang saluran utama drainase. Ruang terbuka hijau yang dilengkapi dengan tempat permainan anak (playground), lapangan basket dan bulu tangkis dan fasilitas peribadatan masjid. Sarana yang ada di dalam Permukiman Bonana dimanfaatkan juga oleh warga sekitar Permukiman Bonana. Di dalam Permukiman, fasilitas ekonomi formal yang dibangun oleh pengembang berupa pertokoan dengan fasilitas perbankan, kebutuhan rumah tangga, kebutuhan medis, dan tempat makan, di samping itu terdapa terdapat pasar informal yang menjual kebutuhan sehari-hari. Pasar informal ini dibentuk oleh masyarakat pedagang. Pada umumnya permukiman yang dibangun oleh pengembang umumnya tertutup terhadap masyrakat sekitarnya, sebagai tidakan preventif terhadap tindak kriminal, namun Permukiman Bonana terbuka antara warga permukiman dengan masyarakat sekitar. Tujuan penelitian mengetahui bentuk partisipasi warga Permukiman Bonana untuk menjaga keamanan dan kenyamanan permukimannya. Penelitian menggunakan pendekatan kualitatif dengan pengumpulan data dengan wawancara dan observasi, dan dengan menggunakan narasumber. Penelitian mendapatkan partisipasi warga Permukiman Bonana untuk menjadikan permukiman yang aman dan nyaman.