Peak Flood Discharge Confidence Limits

Conservative peak flood discharge estimation methods such as the rational method do not take into account the soil infiltration of the precipitation, thus leading to inaccurate estimations of peak discharges during storm events. The accuracy of estimated peak flood discharge is crucial in designing a drainage system that has the capacity to channel runoffs during a storm event, especially cloudbursts and in the analysis of flood prevention and mitigation. The aim of this study was to model the peak flood discharges of each sub-watershed in Selangor using a geographic information system (GIS). The geospatial modelling integrated the watershed terrain model, the developed Soil Conservation Service Curve Cumber (SCS-CN) and precipitation to develop an equation for estimation of peak flood discharge. Hydrological Engineering Center-Hydrological Modeling System (HEC-HMS) was used again to simulate the rainfall-runoff based on the Clark-unit hydrograph to validate the modelled estimation of peak flood discharge. The estimated peak flood discharge showed a coefficient of determination, r2 of 0.9445, when compared with the runoff simulation of the Clark-unit hydrograph. Both the results of the geospatial modelling and the developed equation suggest that the peak flood discharge of a sub-watershed during a storm event has a positive relationship with the watershed area, precipitation and Curve Number (CN), which takes into account the soil bulk density and land-use of the studied area, Selangor in Malaysia. The findings of the study present a comparable and holistic approach to the estimation of peak flood discharge in a watershed which can be in the absence of a hydrodynamic simulation model.

Download Full-text

Quantifying the contribution of flood intensity indicators with the projection pursuit model

Hydrology Research ◽

10.2166/nh.2017.038 ◽

2017 ◽

Vol 49 (1) ◽

pp. 60-71 ◽

Cited By ~ 2

Author(s):

Lina Wang ◽

Yanqing Lian ◽

Xiaohong Chen

Keyword(s):

Southern China ◽

Projection Pursuit ◽

Flood Events ◽

Flood Duration ◽

Flood Discharge ◽

Wujiang River ◽

Flood Volume ◽

Projection Pursuit Model ◽

Flood Intensity ◽

Peak Flood

Abstract Identifying the various factors that affect the intensity of a flood event, such as its duration and volume, is essential for strategic planning and flood management. Further, quantifying the impacts of these major factors on flood intensity using the contribution rate is essential, but technically challenging. In this study, the authors have adopted the projection pursuit model to quantify the contribution rates of peak flood stage and peak flood discharge, flood duration, and total flood volume (the maximum 12-, 24-, and 72-hour flood volumes) in the Wujiang River in Southern China. This study showed that peak flood discharge and total flood volume were the two dominant factors impacting flood intensity. Although flood duration can be a major factor for some flood events, it contributed the least to flood intensity for most of the historic flood events studied. Likewise, the maximum 24-hour and 72-hour flood volumes contributed little to flood intensity. Findings from this study not only demonstrated the successful adoption of the projection pursuit model for contribution rates, but also provided critical information for planning and managing the regional hydraulic resources in the Wujiang River.

Download Full-text

STATISTICAL ANALYSIS OF RAINFALL DATA AND ESTIMATION OF PEAK FLOOD DISCHARGE FOR UNGAUGED CATCHMENTS

International Journal of Research in Engineering and Technology ◽

10.15623/ijret.2016.0514006 ◽

2016 ◽

Vol 05 (14) ◽

pp. 27-31 ◽

Cited By ~ 1

Author(s):

N. Vivekanandan .

Keyword(s):

Statistical Analysis ◽

Rainfall Data ◽

Ungauged Catchments ◽

Flood Discharge ◽

Peak Flood

Download Full-text

Perbandingan Perkiraan Debit Puncak Banjir Menggunakan Metode Nakayasu dan Metode FSR Jawa Sumatera untuk DAS Dombo Sayung

Reka Buana Jurnal Ilmiah Teknik Sipil dan Teknik Kimia ◽

10.33366/rekabuana.v5i2.1894 ◽

2020 ◽

Vol 5 (2) ◽

pp. 38

Author(s):

Muhammad Syarifudin ◽

Karuniadi Satrijo Utomo

Keyword(s):

Natural Disaster ◽

Rainy Season ◽

Rainfall Data ◽

Disaster Mitigation ◽

Material Loss ◽

Public Facilities ◽

Flood Discharge ◽

The Impact ◽

Detrimental Impact ◽

Peak Flood

Banjir merupakan salah satu bentuk bencana alam yang hingga saat ini masih belum dapat diselesaikan. Dampak banjir tidak hanya kerugian infrastruktur berupa jalan dan fasilitas umum akan tetapi kerugian materil menjadi bagian dari dampak yang merugikan bagi masyarakan. Padahal, bagi sebagian warga di Semarang dan Kabupaten Demak, banjir menjadi persoalan rutin pada musim penghujan. Daerah yang menjadi langganan banjir di Demak yaitu daerah Sayung, Karang Asem dan Mranggen. Banjir di daerah tersebut sulit diatasi bahkan semakin lama persoalan banjir tersebut semakin parah dan meluas. Dengan demikian penelitian ini bertujuan untuk mengetahui perbandingan perkiraan debit puncak banjir melalui dua metode yang berbeda. Berdasarkan pada hasil maka mitigasi bencana juga dapat ditingkatkan. Metode dalam penelitian ini menggunakan metode Nakayasu dan FSR Jawa Sumatera untuk mengukur debit puncak banjir dengan menggunakan rentang data curah hujan 10 tahun. Adapun hasil analisis menunjukkan bahwa debit banjir yang dianalisis dengan menggunakan metode Nakayasu menghasilkan debit banjir lebih besar daripada analisis debit banjir menggunakan FSR Jawa Sumatera. Hasil analisis dengan menggunakan metode Nakayasu diperoleh nilai terbesar untuk Sungai Penggaron 270,4 m3/detik. Sungai Dombo Sayung 296,4 m3/detik dan Sugai Dolok 332,2 m3/detik. Adapun, untuk Metode FSR Jawa Sumatera diperoleh nilai terbesar untuk Sungai Penggaron 112,7 m3/detik. Sungai Dombo Sayung 239,7 m3/detik dan Sugai Dolok 632,1 m3/detik.Kata kunci : debit banjir; dombo sayung; FSR Jawa Sumatera; nakayasu ABSTRACTFlooding is a form of natural disaster that has yet to be resolved. The impact of flooding is the loss of infrastructure in roads and public facilities, but a material loss is part of the community's detrimental impact. For some residents in Semarang and Demak Regency, flooding is a routine problem during the rainy season. Areas that are regularly flooded in Demak are Sayung, Karang Asem, and Mranggen. Floods in the area are challenging to overcome, even if flooding is getting worse and broader. Thus this study aims to determine the comparison of the estimated peak flood discharge through two different methods. Based on the results, disaster mitigation can also be improved. This study used Nakayasu and Java Sumatera FSR to measure the peak flood discharge using a ten-year rainfall data range. The analysis results show that the flood discharge analyzed using the Nakayasu method produces a more massive flood discharge than the flood discharge analysis using the Java Sumatra FSR. The analysis results using the Nakayasu method obtained the most significant value for the Penggaron River 270.4 m3/second. Sungai Dombo Sayung 296.4 m3/second and Sugai Dolok 332.2 m3/second. Meanwhile, for the Java Sumatra FSR Method, the most significant value was obtained for the Penggaron River 112.7 m3/second. Sungai Dombo Sayung 239.7 m3/second and Sugai Dolok 632.1 m3/second.

Download Full-text

Features of the Maximum Water Flows of the Arpa River Under Modern Conditions

E3S Web of Conferences ◽

10.1051/e3sconf/202133302006 ◽

2021 ◽

Vol 333 ◽

pp. 02006

Author(s):

Varduhi Margaryan ◽

Levon Azizyan ◽

Amalya Misakyan ◽

Ekaterina Gaidukova ◽

Gennady Tsibul’skii ◽

...

Keyword(s):

Actual Data ◽

Water Flows ◽

Flood Discharge ◽

Maximum Water ◽

Monitoring Center ◽

The Republic ◽

Discharge Distribution ◽

Peak Flood

The paper discusses the main regularities of the peak flood discharge distribution in modern conditions, using actual data of Hydrometeorology and Monitoring Center SNCO with Ministry of Environment of the Republic of Armenia on the peak flood discharge of the river Arpa.

Download Full-text

Uncertainty in flood discharges from urban and small rural catchments due to inaccurate head measurement

Hydrology Research ◽

10.2166/nh.2005.0018 ◽

2005 ◽

Vol 36 (3) ◽

pp. 245-257 ◽

Cited By ~ 6

Author(s):

A. Petersen-Øverleir ◽

T. Reitan

Keyword(s):

Measurement Accuracy ◽

Confidence Limits ◽

Annual Maximum ◽

Flood Discharge ◽

Frequent Use ◽

Uncertainty Model ◽

Instantaneous Discharge ◽

Using Data ◽

A Minor ◽

The Impact

Despite frequent use of estimated flood discharges from urban and small rural catchments, the assessment of uncertainty in instantaneous discharge due to inaccurate head measurements is generally not performed. The present work discusses the impact of inaccurate head measurement on observed instantaneous flood discharge. The sources and sizes of uncertainties in head determination are discussed. A simple uncertainty model is developed in order to quantify the uncertainty in error-corrupted instantaneous and mean discharge. It is shown that uncertainty in mean discharge is less affected by uncorrelated head measurement error, while instantaneous discharges are substantially affected. Practical modelling using data from a Norwegian urban gauging station is undertaken. It is shown that the estimated annual maximum instantaneous flood discharge from this watershed has 95% confidence limits with sizes of 17–19% of the estimated discharge for average head measurement accuracy. Furthermore, it is shown that variability in head determination causes only a minor potential for bias in estimated instantaneous flood population statistics and quantiles.

Download Full-text

A COMPARATIVE STUDY ON PEAK FLOOD DISCHARGE ESTIMATES BY EXTREME VALUE FAMILY OF PROBABILITY DISTRIBUTIONS

i-manager’s Journal on Future Engineering and Technology ◽

10.26634/jfet.16.1.17521 ◽

2020 ◽

Vol 16 (1) ◽

pp. 1

Author(s):

N. VIVEKANANDAN ◽

Keyword(s):

Comparative Study ◽

Probability Distributions ◽

Extreme Value ◽

Flood Discharge ◽

Peak Flood

Download Full-text

EVALUASI FAKTOR TEKNIS PENENTU KRITERIA DRAINASE BERWAWASAN LINGKUNGAN

INDONESIAN JOURNAL OF CONSTRUCTION ENGINEERING AND SUSTAINABLE DEVELOPMENT (CESD) ◽

10.25105/cesd.v2i1.6012 ◽

2019 ◽

Vol 2 (1) ◽

pp. 1

Author(s):

Sih Andajani ◽

Dina P.A Hidayat

Keyword(s):

Water Resources ◽

Integrated Management ◽

Public Works ◽

Rain Garden ◽

Flood Discharge ◽

Technical Factors ◽

Resources Conservation ◽

Environmentally Sound ◽

Zero Runoff ◽

Peak Flood

Integrated management of water resources is something that must be done to ensure the sustainability of water resources. Based on Minister of Public Works Regulation No. 10 of 2015, water resources management in Indonesia is based on 5 pillars where one of the pillars is the conservation of water resources. Conservation of water resources is a basic concept of ecodrain wherein rainwater falling as much as possible will be absorbed into the ground again or known as zero runoff. One of the technical factors that determine environmentally sound drainage criteria is the recharge system. In this research, the influence of the application of bioretension and rain garden will be discussed as one of the absorption systems for runoff hydrographs in an area, in this case the Upper Cisadane Watershed is used as the research location. Based on the results of the study, it was obtained the reduction of peak flood discharge with the application of type I, II, III and IV biorescence to the existing peak flood discharge of 26.89-26.93%, and reduction of peak flood discharge with the application of rain garden of 27.73%.

Download Full-text