Spatial and statistical analysis on the cause of flooding in Northwest Jakarta floodplain (Kapuk and Penjaringan Districts)

Jakarta, as the capital city of Indonesia, is one of the most flooded areas in Indonesia. The floods occurred annually and heavy floods usually occurred once in a few years. This paper address the geographic distribution of floods and statistical analysis of the floods causes by using rain intensity, tidal height, elevation, and floods occurrence as the parameters. This research was conducted in Angke (Kapuk) and Penjaringan Districts, located in Northern Jakarta where the floods usually occur. The result shows that rainfall intensity, remaining water inundation from the previous flood, and land runoff coefficient as the key factors of flooding in these areas.

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Simulasi Penempatan Rorak Sebagai Bentuk Pengoptimalan Konservasi Air

Jurnal Alami : Jurnal Teknologi Reduksi Risiko Bencana ◽

10.29122/alami.v4i2.4558 ◽

2021 ◽

Vol 4 (2) ◽

pp. 124-134

Author(s):

Akhmadi Puguh Raharjo

Keyword(s):

Comparative Advantage ◽

Water Conservation ◽

Surface Runoff ◽

Rainfall Intensity ◽

Root Zone ◽

Runoff Coefficient ◽

Optimal Conditions ◽

Rain Intensity ◽

Uniform Value ◽

Catchment Areas

Trenching is a form of soil and water conservation engineering that is commonly used and is known to be effective in controlling runoff and increasing water content in the root zone of plants. There are various configurations of trench placement in the field and this study aims to simulate the placement of trench by comparing the three trench configurations to find out which configuration is most effective in capturing surface runoff. The simulation is carried out by calculating the catchment capacity of surface runoff under different rainfall intensity conditions and runoff coefficients in the three trench configurations that have different catchment areas. From the calculation, it is known that configuration 3 in optimal conditions has a comparative advantage of 41.67% - 68.80% (compared to configuration 1) and 27.78% - 52.83% (compared to configuration 2). Meanwhile, configuration 2 has a comparative advantage of 13.89% - 16.06% when compared to configuration 1. From the calculation it is also known that there are conditions where the three configurations will produce a uniform value so that there will be no comparative advantage between the three configurations. This condition is generally above the rain intensity of 50 mm per hour and the runoff coefficient is above 0.45.

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The economy of the Chukotka Autonomous Okrug: On the path from monodependence to diversification

Regional Economics Theory and Practice ◽

10.24891/re.18.4.662 ◽

2020 ◽

Vol 18 (4) ◽

pp. 662-674

Author(s):

S.G. Serikov

Keyword(s):

Economic Development ◽

Statistical Analysis ◽

Gross Regional Product ◽

Key Factors ◽

Economic Problems ◽

Analysis Methods ◽

Socio Economic Development ◽

Regional Product ◽

Statistical Analysis Methods

Subject. This article explores the changes in the economic development of the Chukotka Autonomous Okrug during the Soviet and post-Soviet periods. Objectives. The article aims to identify trends and features of the socio-economic development of the Chukotka Autonomous Okrug. Methods. For the study, I used the comparative, computational, constructive, and statistical analysis methods. Results. The article reveals key factors in the growth of the Chukotka Autonomous Okrug's gross regional product and the economic challenges to the region. As well, the article considers and proposes some possible options for further socio-economic development of the Okrug. Conclusions. The Okrug's current socio-economic problems are caused by not objective reasons only, but subjective factors, as well.

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Sewer System for Improving Flood Control in Tokyo: A Step towards a Return Period of 70 Years

Water Science & Technology ◽

10.2166/wst.1994.0677 ◽

1994 ◽

Vol 29 (1-2) ◽

pp. 303-310 ◽

Cited By ~ 1

Author(s):

Kazuyuki Higuchi ◽

Masahiro Maeda ◽

Yasuyuki Shintani

Keyword(s):

Return Period ◽

Flood Control ◽

Rainfall Intensity ◽

Runoff Coefficient ◽

Large Drop ◽

Construction Costs ◽

Sewer System ◽

Construction Period ◽

Metropolitan Government ◽

Under Construction

The Tokyo Metropolitan Government has planned future flood control for a rainfall intensity of 100 mm/hr, which corresponds to a return period of 70 years, and a runoff coefficient of 0.8. Considering that the realization of this plan requires a long construction period and high construction costs, the decision was made to proceed by stages. In the first stage, the improvement of the facilities will be based on a rainfall intensity of 75 mm/hr (presently 50 mm/hr), corresponding to a return period of 17 years, and a runoff coefficient of 0.8. In the next stage the facilities will be improved to accommodate a rainfall intensity of 100 mm/hr. In the Nakano and Suginami regions, which suffer frequently from flooding, the plan of improvement based on a rainfall intensity of 75 mm/hr is being implemented before other areas. This facility will be used as a storage sewer for the time being. The Wada-Yayoi Trunk Sewer, as a project of this plan, will have a diameter of 8 m and a 50 m earth cover. This trunk sewer will be constructed considering several constraints. To resolve these problems, hydraulic experiments as well as an inventory study have been carried out. A large drop shaft for the trunk sewer is under construction.

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The development of regional differentiation of office construction in the Czech Republic: 1990–2010

Moravian Geographical Reports ◽

10.1515/mgr-2015-0003 ◽

2015 ◽

Vol 23 (1) ◽

pp. 21-33

Author(s):

Pavel Domalewski ◽

Jan Baxa

Keyword(s):

Spatial Distribution ◽

Czech Republic ◽

Questionnaire Survey ◽

Large Scale ◽

Capital City ◽

Office Building ◽

Regional Differentiation ◽

Key Factors ◽

The Czech Republic ◽

Dominant Position

Abstract The factors that were crucial for the construction of administrative buildings in the regional capitals of the Czech Republic are subject to examination in this article. One primary question is whether the development of office construction reflects the qualitative importance of the cities, or whether there are some other regularities in the spatial distribution of construction. To identify the key factors, controlled interviews with experts professionally involved in the construction of administrative buildings were carried out, and these data were then extended as part of a large-scale questionnaire survey with other experts on the issue. The results have confirmed the dominant position of the capital city of Prague in terms of its qualitative importance, as the remaining regional capitals have less than one-tenth of the volume of modern office building areas. The greatest differences in the construction of administrative buildings have been noted in Brno and Ostrava, despite the fact that they exhibit similar characteristics when considered in the light of respondent-determined factors.

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Error in the Sampling Area of an Optical Disdrometer: Consequences in Computing Rain Variables

The Scientific World JOURNAL ◽

10.1155/2013/369450 ◽

2013 ◽

Vol 2013 ◽

pp. 1-8 ◽

Cited By ~ 3

Author(s):

R. Fraile ◽

A. Castro ◽

M. Fernández-Raga ◽

C. Palencia ◽

A. I. Calvo

Keyword(s):

Rainfall Intensity ◽

Rain Event ◽

Rain Intensity ◽

Sampling Area ◽

The Real ◽

Efficient Sampling ◽

Real Value ◽

Effective Sampling Area ◽

Reflectivity Factor

The aim of this study is to improve the estimation of the characteristic uncertainties of optic disdrometers in an attempt to calculate the efficient sampling area according to the size of the drop and to study how this influences the computation of other parameters, taking into account that the real sampling area is always smaller than the nominal area. For large raindrops (a little over 6 mm), the effective sampling area may be half the area indicated by the manufacturer. The error committed in the sampling area is propagated to all the variables depending on this surface, such as the rain intensity and the reflectivity factor. Both variables tend to underestimate the real value if the sampling area is not corrected. For example, the rainfall intensity errors may be up to 50% for large drops, those slightly larger than 6 mm. The same occurs with reflectivity values, which may be up to twice the reflectivity calculated using the uncorrected constant sampling area. TheZ-Rrelationships appear to have little dependence on the sampling area, because both variables depend on it the same way. These results were obtained by studying one particular rain event that occurred on April 16, 2006.

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Central Jakarta Rainfall Intensity Forecast using Single Exponential Smoothing

International Journal of Recent Technology and Engineering - 2 ◽

10.35940/ijrte.d7681.118419 ◽

2019 ◽

Vol 8 (4) ◽

pp. 2105-2108

Keyword(s):

Rainfall Intensity ◽

Forecast Error ◽

Precipitation Amount ◽

Exponential Smoothing ◽

Vital Role ◽

Capital City ◽

Good Prediction ◽

Intensity Prediction ◽

Forecasting Method ◽

Single Exponential

Rainfall is the precipitation amount that is falling from clouds. In extreme conditions, rainfall could arise many problems. It is the leading cause of landslides and flood disasters. In D.K.I. Jakarta, the capital city of Indonesia, rainfall intensity plays a very vital role since it could easily be puddled and caused floods in many areas. Therefore, in this study, we try to make a rainfall intensity prediction in Central Jakarta using a very popular forecasting method, i.e., the Single Exponential Smoothing (SES). Based on the experiments conducted using Phatsa, it can be concluded that the SES method has been successfully used to predict rainfall intensity. However, it cannot give a very good prediction result due to its high forecast error values.

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Activity of the Regional Polish United Workers’ Party Apparatus in 1970–1989

Central European Economic Journal ◽

10.2478/ceej-2021-0006 ◽

2021 ◽

Vol 8 (55) ◽

pp. 79-94

Author(s):

Dariusz Standerski

Keyword(s):

Statistical Analysis ◽

Correlation Coefficient ◽

Communist Party ◽

Economic Activity ◽

Central Government ◽

Capital City ◽

State Archive ◽

Macroeconomic Performance ◽

Macroeconomic Variables ◽

Archival Documents

Abstract The article aims to verify whether, in the 1980s, there was a significant decrease in the involvement of the regional communist party structures in charge of economic affairs in Poland. The analysis is made on the case of the Warsaw Committee (KW) of the Polish United Workers’ Party (PUWP). Archival documents gathered in the State Archive in Warsaw were used to perform the analysis. The protocols of the meetings of the Executive and Secretariat 1970–1989 were collected, described and analysed. Moreover, the analysis was supplemented by the Statistical Yearbooks of Warsaw (GUS, 1957–1974), the Statistical Yearbooks of the Capital City of Warsaw (GUS, 1976–1981) and the Journal of Laws of the People's Republic of Poland 1970–1989. A statistical analysis of economic activity of the KW of the PUWP in the context of macroeconomic variables and economic activity of central authorities was performed. The correlation coefficient between macroeconomic performance and Party activity indicates the convergence of both trends in the 1970s and the lack of correlation in the 1980s. The decline in engagement after 1978 was unprecedented. In this period, there was a discrepancy between the activities of the central government and the Party apparatus, which remained in place until the end of the system. Institutional mechanisms in the Principal–Agent relation weakened significantly in 1980s.

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Statistical Analysis of the Key Factors of Landslide Induced by Wenchuan Earthquake

Earthquake-Induced Landslides ◽

10.1007/978-3-642-32238-9_101 ◽

2012 ◽

pp. 925-936 ◽

Cited By ~ 1

Author(s):

Runqiu Huang ◽

Guo Li ◽

Nengpan Ju ◽

Jianjun Zhao

Keyword(s):

Statistical Analysis ◽

Wenchuan Earthquake ◽

Key Factors

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A new modeling approach for estimating first flush metal mass loading

Water Science & Technology ◽

10.2166/wst.2005.0587 ◽

2005 ◽

Vol 51 (3-4) ◽

pp. 159-167 ◽

Cited By ~ 27

Author(s):

L.-H. Kim ◽

M. Kayhanian ◽

S.-L. Lau ◽

M.K. Stenstrom

Keyword(s):

First Flush ◽

Runoff Coefficient ◽

Mass Loading ◽

Storm Events ◽

Metal Contaminants ◽

Rain Intensity ◽

Dry Period ◽

Variable Parameters ◽

Total Runoff ◽

First Flush Effect

The purpose of this study was to investigate pollutant mass loading from major highways in Southern California, with emphasis on interpretation of event mean concentrations and first flush effects. The results of monitoring eight sites during the 1999–2002 storm seasons found that metal contaminants had higher concentrations at the early stages of storm events compared with other stages of rain storms. A new washoff model was developed to predict the event mean concentrations of metal contaminants taking first flush effect into account. Model variable parameters included average daily traffic, antecedent dry period, rain intensity, total runoff volume, and runoff coefficient. The results obtained using the washoff model were compared with measured values and found to fit well for heavy metals with R2 ranging from 0.8 to 0.95.

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