Flood Reduction Analysis by Using Multiple Dams Sscenario in Karang Mumus River, Samarinda

Flooding issues in Samarinda have high depending on the capacity of Karang Mumus river. Considering the ability of Karang Mumus river to drain off flood discharge, there wore evidence that the constriction of River will drive to flooding issues, especially in rainy/wet season (October-April). The constriction of river happens because many people build nonpermanent houses and building on the river and river banks. Flooding potentially damages to the houses, roads, and other public facilities increasingly. To cope the issue, Government of Samarinda has tried many solutions to overcome the issue by building The Benanga dam and it has been planned to build multiple Dams in Karang Mumus sub-Watershed. This paper aims to analyze the effectiveness of flood control effort using multiple dams scenario in Karang Mumus Sub-Watershed. Analyzing process including hydrology simulation, the relationship between hydrographs and rise of water level simulation in Karang Mumus River. The result of this paper shows water level when peak discharge flows out existing river bank. Analyzing result also shows that flood control scenario is effective to reducing flood discharge until fifty percent compared without existing conditions.

Download Full-text

Analysis Physical Characteristics of Land for Estimated Runoff Coefficient as Flood Control Effort in Comal Watershed, Central Java

Forum Geografi ◽

10.23917/forgeo.v30i1.1131 ◽

2016 ◽

Vol 30 (1) ◽

pp. 58

Author(s):

Arina Miardini ◽

Pranatasari Dyah Susanti

Keyword(s):

Vegetation Cover ◽

Flood Control ◽

Infiltration Rate ◽

Drainage Density ◽

Physical Characteristics ◽

Peak Discharge ◽

Runoff Coefficient ◽

Mapping Unit ◽

Control Effort ◽

Central Java

Watershed conditions in Indonesia have been degraded over time, which is marked by increasing area of critical land. The vast area of critical land was evidenced to be a serious threat for watershed carrying capacity which eventually affected the hydrology imbalance in the watershed area. One among watershed with degraded lands which seriously requires priority handling is Comal watershed. The purpose of this study is to identify the physical characteristics of Comal watershed which have significant influence in determining the runoff and calculating the runoff coefficient by taking into account the parameters of watershed’s physical characteristics. The method used in this analysis is Cook method, which is done through the estimation of runoff coefficient by evaluating the parameters of slope, infiltration, vegetation cover, and drainage density. The unit of analysis in this study is land mapping unit. Results of the four parameters are classified and the classification is done so that the scores of the runoff coefficient are figured out, while the peak discharge determination is performed by using the Rational method. The analysis showed that runoff coefficient of Comal watershed is 61.63%, which can be categorized as high. The runoff coefficients and peak discharge calculations of each sub watershed, respectively, Comal Hilir of 52.65% with peak discharge 505.68 m3/sec, Genteng of 65.04% with peak discharge 542.44 m3/sec, Lomeneng of 64.00% with peak discharge 194.23 m3/sec, Srengseng of 64.10% with peak discharge 270.46 m3/sec, and Wakung Hulu of 62.34% with peak discharge 686.64 m3/ sec. The most influential runoff coefficient factors are, respectively, infiltration rate, slope, vegetation cover, and drainage density. Flood control priority in Comal watershed should be preoccupied to increase the infiltration rate through a combination of three conservation techniques of mechanical, vegetative, and biology.

Download Full-text

DAS Ampal Analisa Fungsi dan Pengaruh Bangunan Pengendali Banjir DAS Ampal Kota Balikpapan

SPECTA Journal of Technology ◽

10.35718/specta.v2i3.10 ◽

2018 ◽

Vol 2 (3) ◽

pp. 39

Author(s):

Rossana Margaret Kadar Yanti ◽

Edijatno Edijatno ◽

Umboro Lasminto

Keyword(s):

Catchment Area ◽

Flood Control ◽

Peak Discharge ◽

Flood Peak ◽

Flood Discharge ◽

Main River ◽

The Difference

Ampal Catchment Area has 25.273 km2 area and 4.699 km main river length, which planned to have 13 flood control construction. Until 2017, this catchment area has only three flood control construction. The watershed has only three built-in batters that are used to reduce the amount of flood discharge flowing on the Ampal river. Based on these conditions, it is necessary to analyze the magnitude of the difference of flood peak discharge on the existing condition (three bendali) compared with the condition of the plan (thirteen bendali). Therefore, analyzed the function and influence of flood control construction in Ampal Catchment Area by counting the flood peak discharge in each condition. From the analysis result, obtained the amount of peak discharge flowing in Ampal river existing condition is equal to 170,40 m3/s while at the condition of plan is equal to 83,80 m3/s. From the results of analysis, it is stated that the magnitude of the decrease of debit (ΔQ) after all the builds is 86.60 m3/s.

Download Full-text

Estimasi Debit Puncak Menggunakan Hidrograf Satuan Sintetik Pada Daerah Aliran Sungai Kayan Kabupaten Bulungan

Borneo Engineering : Jurnal Teknik Sipil ◽

10.35334/be.v3i2.1173 ◽

2020 ◽

Vol 3 (2) ◽

pp. 115-128

Author(s):

Asta Asta ◽

Nurjaya Nurjaya

Keyword(s):

Calculation Method ◽

Peak Discharge ◽

Unit Hydrograph ◽

Flood Discharge ◽

Synthetic Unit Hydrograph ◽

Prone Area ◽

Calculation Results ◽

Flood Prone Area ◽

The Relationship

The Kayan Watershed in Bulungan Regency is the largest river in North Kalimantan which has the potential for flooding in several irrigated points. Kayan River is a flood-prone area and prioritized to be handled immediately because there is already a smooth life for the community. Potentially need to know the great potential of flooding in the Kayan River. To find out the relationship between flood discharge and flood time, the Synthetic Unit Hydrograph calculation method is used. The aim is to determine the shape and results of peak discharge in Synthetic Unit Hydrograph Y (SUH). This study uses a debit calculation in the Kayan watershed using Snyder HSS a nd Nakayasu HSS. From the calculation results obtained Snyder SUH peak discharge of 118.0 m3/ sec at 73.85 hours, and Nakayasu SUH has a peak discharge of 109.35 m3 / sec at 54.09 hours.

Download Full-text

HIDROLOGICAL SIMULATION OF THE RIVERS’ FLOOD CONTROL IN SUBDISTRIC WONOKERTO IN PEKALONGAN REGENCY

Pondasi ◽

10.30659/pondasi.v24i2.7644 ◽

2019 ◽

Vol 24 (2) ◽

pp. 148

Author(s):

Bayu Purnama Fitra ◽

M. Faiqun Niam

Keyword(s):

Water Level ◽

River Water ◽

Flood Control ◽

Hydrological Simulation ◽

River Catchment ◽

Flood Discharge ◽

River Flood

ABSTRACT:Flooding problem still become serious problem in subdistrict Wonokerto of Pekalongan regency. There are six rivers that have the potential caused flooding in setelment area. In this research, the researcher wanted to do hydrological simulation at six rivers in Wonokerto. The hydrological simulation is done by calculating the inflow in the river in the form of flood discharge hydrograph design with nakayasu method, and evaluate the capacity of river catchment to flood discharge. Based the results research on six rivers, it is known that the river capacity is not able to accommodate the flood discharge when enters the river. The River water are also known unable to flow by gravity caused of rob dikes that isolated the river water to flow into the sea, therefore to prevent overflow in the river needs and to prevent overflow and to control the river water level a pumping in rivers.Keywords: Hydrological Simulation, River Flood Control, Storage Evaluation, Pumping

Download Full-text

HIDROLOGICAL SIMULATION OF THE RIVERS’ FLOOD CONTROL IN SUBDISTRIC WONOKERTO IN PEKALONGAN REGENCY

Pondasi ◽

10.30659/pondasi.v23i2.11208 ◽

2020 ◽

Vol 23 (2) ◽

pp. 13

Author(s):

Bayu Purnama Fitra ◽

Slamet Imam Wahyudi ◽

Gata Dian Asfari

Keyword(s):

Water Level ◽

River Water ◽

Flood Control ◽

Hydrological Simulation ◽

River Catchment ◽

Flood Discharge ◽

River Flood

Abstract: Flooding problem still become serious problem in subdistrict Wonokerto of Pekalongan regency. There are six rivers that have the potential caused flooding in setelment area. In this research, the researcher wanted to do hydrological simulation at six rivers in Wonokerto. The hydrological simulation is done by calculating the inflow in the river in the form of flood discharge hydrograph design with nakayasu method, and evaluate the capacity of river catchment to flood discharge. Based the results research on six rivers, it is known that the river capacity is not able to accommodate the flood discharge when enters the river. The River water are also known unable to flow by gravity caused of rob dikes that isolated the river water to flow into the sea, therefore to prevent overflow in the river needs and to prevent overflow and to control the river water level a pumping in rivers.Keywords: Hydrological Simulation, River Flood Control, Storage Evaluation, Pumping

Download Full-text

Process-Based Modeling of the High Flow of a Semi-Mountain River under Current and Future Climatic Conditions: A Case Study of the Iya River (Eastern Siberia)

Water ◽

10.3390/w13081042 ◽

2021 ◽

Vol 13 (8) ◽

pp. 1042

Author(s):

Andrey Kalugin

Keyword(s):

Water Level ◽

River Basin ◽

21St Century ◽

Residential Buildings ◽

High Flow ◽

Peak Discharge ◽

Future Climate ◽

Future Climate Change ◽

Generation Model ◽

Annual Peak

The purpose of the study was to analyze the formation conditions of catastrophic floods in the Iya River basin over the observation period, as well as a long-term forecast of the impacts of future climate change on the characteristics of the high flow in the 21st century. The semi-distributed process-based Ecological Model for Applied Geophysics (ECOMAG) was applied to the Iya River basin. Successful model testing results were obtained for daily discharge, annual peak discharge, and discharges exceeding the critical water level threshold over the multiyear period of 1970–2019. Modeling of the high flow of the Iya River was carried out according to a Kling–Gupta efficiency (KGE) of 0.91, a percent bias (PBIAS) of −1%, and a ratio of the root mean square error to the standard deviation of measured data (RSR) of 0.41. The preflood coefficient of water-saturated soil and the runoff coefficient of flood-forming precipitation in the Iya River basin were calculated in 1980, 1984, 2006, and 2019. Possible changes in the characteristics of high flow over summers in the 21st century were calculated using the atmosphere–ocean general circulation model (AOGCM) and the Hadley Centre Global Environment Model version 2-Earth System (HadGEM2-ES) as the boundary conditions in the runoff generation model. Anomalies in values were estimated for the middle and end of the current century relative to the observed runoff over the period 1990–2019. According to various Representative Concentration Pathways (RCP-scenarios) of the future climate in the Iya River basin, there will be less change in the annual peak discharge or precipitation and more change in the hazardous flow and its duration, exceeding the critical water level threshold, at which residential buildings are flooded.

Download Full-text

Optimal Operation of Floodwater Resources Utilization of Lakes in South-to-North Water Transfer Eastern Route Project

Sustainability ◽

10.3390/su13094857 ◽

2021 ◽

Vol 13 (9) ◽

pp. 4857

Author(s):

Zitong Yang ◽

Xianfeng Huang ◽

Jiao Liu ◽

Guohua Fang

Keyword(s):

Water Level ◽

Resource Utilization ◽

Flood Control ◽

Optimal Operation ◽

Water Transfer ◽

Water Levels ◽

Reservoir Storage ◽

Flood Season ◽

Hongze Lake ◽

North Water

In order to meet the demand of emergency water supply in the northern region without affecting normal water transfer, considering the use of the existing South-to-North Water Transfer eastern route project to explore the potential of floodwater resource utilization in the flood season of Hongze Lake and Luoma Lake in Jiangsu Province, this paper carried out relevant optimal operating research. First, the hydraulic linkages between the lakes were generalized, then the water resources allocation mode and the scale of existing projects were clarified. After that, the actual available amount of flood resources in the lakes was evaluated. The average annual available floodwater resources in 2003–2017 was 1.49 billion m3, and the maximum available capacity was 30.84 billion m3. Then, using the floodwater resource utilization method of multi period flood limited water levels, the research period was divided into the main flood season (15 July to 15 August) and the later flood season (16 August to 10 September, 11 September to 30 September) by the Systematic Clustering Analysis method. After the flood control calculation, the limited water level of Hongze Lake in the later flood season can be raised from 12.5 m to 13.0 m, and the capacity of reservoir storage can increase to 696 million m3. The limited water level of Luoma Lake can be raised from 22.5 m to 23.0 m (16 August to 10 September), 23.5 m (11 September to 30 September), and the capacity of reservoir storage can increase from 150 to 300 million m3. Finally, establishing the floodwater resource optimization model of the lake group with the goals of maximizing the floodwater transfer amount and minimizing the flood control risk rate, the optimal water allocation scheme is obtained through the optimization algorithm.

Download Full-text

Evaluating Simple Methodology for Piezoelectric Level Sensors Protection

Proceedings ◽

10.3390/ecws-4-06448 ◽

2019 ◽

Vol 48 (1) ◽

pp. 30

Author(s):

Luis Hamilton Pospissil Garbossa ◽

Argeu Vanz ◽

Matias Guilherme Boll ◽

Hamilton Justino Vieira

Keyword(s):

Water Level ◽

Flood Control ◽

Low Cost ◽

Solid Particles ◽

Storm Events ◽

Sewer Systems ◽

Continuous Monitor ◽

Level Monitoring ◽

Water Level Monitoring

The increasing frequency of extreme storm events has implications for the operation of sewer systems, storm water, flood control monitoring and tide level variations. Accurate and continuous monitor water level monitoring is demanded in different environments. Piezoelectric sensors are widely used for water level monitoring and work submerged in waters subject to the presence of solid particles, biological fouling and saltwater oxidation. This work aimed to develop a simple, low-cost methodology to protect sensors over long-term deployment. The results show that simple actions, costing less than 2 EUR, can protect and extend the lifecycle of equipment worth over 2000 EUR, ensuring continuous monitoring and maintaining quality measurements.

Download Full-text

An ecological explanation for hyperallometric scaling of reproduction

10.1101/2021.03.12.435090 ◽

2021 ◽

Author(s):

Tomos Potter ◽

Anja Felmy

Keyword(s):

Body Size ◽

Reproductive Output ◽

Resource Competition ◽

Natural Populations ◽

Scaling Exponent ◽

Wild Populations ◽

Wet Season ◽

Size Dependent ◽

In The Wild ◽

The Relationship

AbstractIn wild populations, large individuals have disproportionately higher reproductive output than smaller individuals. We suggest an ecological explanation for this observation: asymmetry within populations in rates of resource assimilation, where greater assimilation causes both increased reproduction and body size. We assessed how the relationship between size and reproduction differs between wild and lab-reared Trinidadian guppies. We show that (i) reproduction increased disproportionately with body size in the wild but not in the lab, where effects of resource competition were eliminated; (ii) in the wild, the scaling exponent was greatest during the wet season, when resource competition is strongest; and (iii) detection of hyperallometric scaling of reproduction is inevitable if individual differences in assimilation are ignored. We propose that variation among individuals in assimilation – caused by size-dependent resource competition, niche expansion, and chance – can explain patterns of hyperallometric scaling of reproduction in natural populations.

Download Full-text