Browsing by Author "Siddiq, Raden Herdian Bayu Ash"

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    ANALYSIS OF CONTROL OF COSTS AND TIME WITH EARNED VALUE METHOD ON ROAD MAINTENANCE PROJECTS IN PALMERAH DISTRICT, WEST JAKARTA
    (Horizon Research Publishing, 2019) Radhitya Akbar, Sandy; Setiawan, Asep; Istambul, M. Rozahi; Siddiq, Raden Herdian Bayu Ash
    Control in a construction project generally involves three main aspects, namely: cost, time and human resources. This study uses Network Planning analysis as a control function with the Critical Path Method (CPM) method in calculating the difference in cost and time needed to complete the work with a planned budget and schedule. This study also tried to implement an integrated control function, namely the Earned Value Method for a construction project. Based on the analysis and calculation in the 8th week (eight) of the total duration of the project, the analysis produces CPI value = 1.06 which shows that the performance of contractor's expenditure costs is more efficient than the planned budget. The description of the final condition of the project also shows that there is a residual budget value of Rp 321,642,608.01 or 5.55% of the total value of the overall project cost budget or Budgeted At Completion (BAC) which is an advantage for the contractor. The analysis also produces SPI value = 0.94 which means that the time performance index is of good value but the execution of the work is a little slower than the overall planned schedule.
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    COMPARISON OF ROAD OVERLAY LAYER THICKNESS USING THE COMPONENTS ANALYSIS METHOD AND DEFLECTION ANALYSIS METHOD ON ROADS LIMBANGAN–MALANGBONG
    (International Journal of Psychosocial Rehabilitation, Vol.24, Issue 02, 2020) Siddiq, Raden Herdian Bayu Ash; Komarudin, Udin
    Highway is one of the transportation infrastructure in Indonesia which is often used to support economic activities, especially on provincial roads. However, often on provincial roads there are damages to road pavements which disrupt motorists' comfort. Limbangan - Malangbong road segment is a road with provincial road status. So that road construction can serve traffic flow according to the age of the plan, it is necessary to have a good pavement plan, because then the pavement construction is capable of carrying the burden of vehicles passing on it. This study aims to compare flexible pavement designs using component analysis methods and deflection analysis method. From the analysis results, the overlay thickness with the component analysis method is 8 cm and the backward deflection method is 4 cm. It was also concluded that the results of CBR testing from STA 0 + 100 to 4 + 070 were majority below 6% which means that the land needs to be compaction first.
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    FLOOD CONTROL WITH RETENTION POND IN MANJAHLEGA VILLAGES, RANCASARI SUB DISTRICT, BANDUNG
    (International Journal of Psychosocial Rehabilitation, Vol.24, Issue 02, 2020) Siddiq, Raden Herdian Bayu Ash
    Human activities in urban areas have a positive impact on development and economic progress. But on the other side caused environmental problems like floods and groundwater levels to decrease. Several areas in Bandung have become annual flood subscriptions caused by overflow from river or drainage. For example, it is Manjahlega Villages at Rancasari Sub District. In this area, flood always occurs between 20 - 50 cm every year. From the results of the hydrological analysis, it was found that the area of retention ponds was 0.98 ha with a catchment area of 130 ha. A 2year rain period of 85.98 mm produces a discharge of 9.5 m3 / s and a 10year rain return period of 126.16 mm produces a discharge of 13.94 m3 / s. The results of Storm Water Management Model (SWMM) modelling concluded that with the Retention Pond, overflow from drainage channels of the Manjahlega Villages can be solved, these conditions can be optimized by adding drainage capacity and channel maintenance with periodic dredging.
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    LAND SUBSIDENCE OF KANTO PLAIN DETECTION USING JERS-1 SAR INTERFEROMETRY
    (Horizon Research Publishing, 2019) Agustian, Yanyan; Hasan, Fuad; Siddiq, Raden Herdian Bayu Ash
    Since InSAR technique has a capability to detect a small surface elevation changes over large area, InSAR system has been used widely for good resolution mapping and other applications on various applied sciences. InSAR imagery is applied to investigate surface change and result detailed maps of contour, which help to detect disaster areas. This research is aimed to estimate the land subsidence using the differential interferometric synthetic aperture radar (InSAR). The research object is located in the west part of Japan, Kanto Plain area, where ground water actively is being extracted in quite large scale and produces centimeters of subsidence every year. Over the analyzed area, the surface deformation was detected and it was only related to subsidence process. In other words, there is no surface arising or uplift of surface. It signed by color phase changes correspond from zero to minus values.
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    MORPHOMETRY STUDY AND INTEGRATED MANAGEMENT OF DIBAWAH LAKE WATERSHED SOLOK REGENCY
    (Horizon Research Publishing, 2019) Siddiq, Raden Herdian Bayu Ash; Hasan, Fuad; Agustian, Yanyan; KS, Ajeng Mayang; Saudi, Mohd. Haizam bin Mohd.
    Dibawah Lake is a tectonic lake located in Solok Regency, West Sumatra. It’s functioned as the West Sumatra Government as a tourist area, besides that it was also used as an irrigation water source. This study aims to obtain information on the characteristics of lake morphometry and formulate the concept of integrated management of Dibawah Lake Catchment Area. From the results of bathymetry mapping produces a lake area of 10998.1 ha with a circumference of 17.2 km, a maximum length of 6.4 km, a maximum width of 3 km, a maximum depth of 326.8 m, an average depth of 164.3 m and volume of 1688 million m3. The lake catchment area is 2881.7 ha and it is divided into 27 sub-catchments. The existing problems in the Dibawah Lake are (1) changes in lake area land cover into agricultural fields, (2) agricultural cropping patterns in slope areas, (3) lakefront settlements, (4) water quality degradation, (5) fish cages floating net and fishing ring. From the results of the SWOT analysis, the W-T (Weaknesses - Threats) strategy was chosen as the top priority. The W-T strategy focuses on strengthening and drafting rules, monitoring the implementation of rules, enforcing violations and socialization of the community.
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    PREDICTION OF LAND EROSION BY USLE METHOD IN DIBAWAH LAKE CATCHMENT AREAS, SOLOK REGENCY
    (Horizon Research Publishing, 2019) Siddiq, Raden Herdian Bayu Ash
    The Government of West Sumatra functioned Dibawah Lake as a tourist area. Besides that, it is also used as an irrigation water source. Location of the Dibawah Lake, which is in the highlands with slope levels between 28% - 40% gives rise to the potential for land erosion in the lake catchment area, which is quite high. This study aims to predict the magnitude of land erosion, sediment delivery ratio and sedimentation rate in lake bodies using topographic spatial analysis and the USLE (Universal Soil Loss Equation) method. From the results of the analysis, it was found that the Dibawah Lake Catchment Area reached 2881.7 ha, which was divided into 27 sub-catchments. The rainfall erosivity value (R) of the Dibawah Lake catchment area is 8219.46 mm. The types of soils in the Dibawah Lake catchment area are cambisols and Andosols with soil erodibility values (K) 0.22 and 0.20. The slope average of the Dibawah lake catchment area is 28% - 40%. The total land erosion in the Dibawah Lake catchment area is 1061.36 tons/ year. The Sediment Delivery Ratio (SDR) of the Dibawah Lake catchment area is 31.08%. With an SDR value of 31.08%, the sedimentation rate in the Dibawah Lake body is 329.85 tons/ year.
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    STUDY OF POTENTIAL GROUNDWATER AQUIFERS WITH SCHLUMBERGER CONFIGURATION GEO-ELECTRIC METHOD IN PALANGGAI VILLAGE EAST SUMBA REGENCY
    (International journal of innovation, creativity and change, 2019) Siddiq, Raden Herdian Bayu Ash; Anwar, Asep
    earth. The presence of groundwater is not evenly distributed for every place and is strongly related to its geological and geohydrological conditions. The research location is in Palanggai Village, East Sumba Regency, East Nusa Tenggara Province. Monthly rainfall according to BMKG climatology data in 2005 - 2013 was highest in December, which was 176.78 mm and the lowest was in August at 0.44 mm. This research was conducted to find out about the subsurface layer. Existing groundwater or aquifer carriers are using the geo-electric approach of the Schlumberger method. From the results of the study it can be concluded that (1) geo-electric estimation has been able to provide an overview of the state of the rock layers both vertically and laterally, (2) hydrogeological conditions in the investigation area, including aquifer systems with small to moderate productivity and is widespread, (3) rocks which are expected to be able to act as a limestone and limestone sand aquifer, (4) From the results of a geo-electric estimation investigation, it can be seen that the aquifer layer is found in depths ranging from 10-110m.
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    STUDY OF RAILROAD CROSSING AT MERDEKA STREET, KIARACONDONG AND ANDIR IN BANDUNG CITY
    (International Journal of Innovation, Creativity and Change, 2019) Siddiq, Raden Herdian Bayu Ash
    Along with population growth and increasing movements to Indonesia, railroad crossing use is increasingly high. One of the triggers for accidents at railroad crossings is the completeness of signs that meet the required standards. From the results of observations and analysis of complete railroad crossings in 3 locations in Bandung, precisely on Merdeka Street, Kiaracondong and Andir, based on the Director General of Land Transportation Regulation number: SK.407 / AJ.401 / DRJD / 2018 concerning Technical Control Guidelines Traffic on Roads in the Location of Potential Accidents at the Railroad Crossing, it was found that these 3 crossing locations do not meet the required standards. This can lead to potential accidents. The 7 things that must be fulfilled in a level crossing are warning signs, prohibited signs, road markers, rumble stripes, line separators, light signal and crossing doors.