scholarly journals Estimation of daily runoff coefficient of the pervious surfaces for the climate conditions of the city of Lviv

2020 ◽  
Vol 5 (3) ◽  
pp. 136-142
Author(s):  
Volodymyr Zhuk ◽  
◽  
Lesya Vovk ◽  
Pavlo Mysak ◽  
◽  
...  

The method of calculation of daily runoff coefficients based on the SCS USDA curve number method is presented in this paper. The calculated values ​​of daily runoff coefficients for climatic and geological conditions of the city of Lviv for maximum daily rainfall events with a return period of 0.1 – 5 years are obtained.

2018 ◽  
Vol 7 (1) ◽  
pp. 26-29
Author(s):  
Asril Zevri

Abstract: Belawan River Basin is one of the watershed, which currently change the land use because of the increasing population and industrial development. Rainfall with high intensity can cause rapid runoff, causing flood around the plains of the river cross section. The purpose of this research is to determine the flood water level of Belawan Watershed and flood discharge return period. Scope of activity in this research is analyzing daily rainfall Belawan watershed with the flood-discharge return period. Scope of activity in this research is analyzing maximum daily rainfall Belawan Watershed, and simulating flood water level with HECRAS. The result of the study shows that the potency of Belawan watershed flood water level is caused by flood discharge at 25 to 100 years especially in the middle to downstream of river cross section that is between 0.7 m and 3.3 m. Keywords: Flood Discharge, Flood Level, Belawan Watershed, Software HECRAS. Abstrak: Daerah Aliran Sungai Belawan adalah salah satu DAS yang pada saat ini mengalami perubahan tata guna lahan seiring bertambahnya jumlah penduduk dan perkembangan industri. Curah hujan yang tinggi dapat mengakibatkan limpasan sehingga menimbulkan tinggi muka air banjir di sekitar dataran penampang sungai. Tujuan dari penelitian ini adalah untuk mensimulasi tinggi muka air banjir DAS Belawan dengan debit banjir periode kala ulangnya. Lingkup kegiatan dalam penelitian ini yaitu menganalisa curah hujan harian maksimum rata-rata DAS Belawan dan menganalisa debit banjir kala ulang 2 sampai dengan 100 tahun, mensimulasi tinggi muka air banjir dengan HECRAS. Hasil studi menunjukan potensi tinggi muka air banjir DAS Belawan terjadi akibat debit banjir periode kala ulang 25 sampai dengan 100 tahun khususnya  di bagian tengah sampai hilir penampang sungai yaitu berkisar antara 0.7 m sampai dengan 3.3 m. Kata kunci: Debit banjir, Tinggi Banjir, DAS Belawan, Software HECRAS.


2017 ◽  
Vol 2017 ◽  
pp. 1-16 ◽  
Author(s):  
Velautham Daksiya ◽  
Pradeep Mandapaka ◽  
Edmond Y. M. Lo

The impact of changing climate on the frequency of daily rainfall extremes in Jakarta, Indonesia, is analysed and quantified. The study used three different models to assess the changes in rainfall characteristics. The first method involves the use of the weather generator LARS-WG to quantify changes between historical and future daily rainfall maxima. The second approach consists of statistically downscaling general circulation model (GCM) output based on historical empirical relationships between GCM output and station rainfall. Lastly, the study employed recent statistically downscaled global gridded rainfall projections to characterize climate change impact rainfall structure. Both annual and seasonal rainfall extremes are studied. The results show significant changes in annual maximum daily rainfall, with an average increase as high as 20% in the 100-year return period daily rainfall. The uncertainty arising from the use of different GCMs was found to be much larger than the uncertainty from the emission scenarios. Furthermore, the annual and wet seasonal analyses exhibit similar behaviors with increased future rainfall, but the dry season is not consistent across the models. The GCM uncertainty is larger in the dry season compared to annual and wet season.


2019 ◽  
Vol 4 (2) ◽  
pp. 63-70
Author(s):  
Meliyana Meliyana ◽  
Ichsan Syahputra ◽  
Helwiyah Zain ◽  
Antoniadi Zal

Impermeable land in a region can not absorb rain water, so that rain water becomes run off and cause flood inundation. Absorption wells function to accommodate and absorb rain water into the soil. The purpose of this study to know the value of soil permeability, determine the dimensions and number  of absorption wells in reducing flood. The study was conducted at Elementary School 1 Pulo Ie Kabupaten Nagan Raya with area of 1500 m2 and the number of buildings as many as 4 units. The absorption well planning refers to regulation of the Minister of Public Works 11/PRT/M/2014. The data used in the planning form average daily rainfall, flood volume, soil permeability value, runoff coefficient value, depth of ground water level and wide field of cistern. The result of analysis obtained maximum daily rainfall average maximum (R) equal to 36,25 mm/day, volumes of flood (Vab)  11,552 m3, cistern area  497 m2, runoff coefficient value of 0.75 and soil permeability value (K) 0.009725 cm/sec or 8.40 m/day. Rectangular Absorption wells with depth of well (H) 1.60 meters and base well (L) width 1.20 meters. The number of absorption wells required 5 units. Thus, the flood of inundation at the Elementary School 1 Pulo Ie can be accommodated by the absorption wells, so that the flood of inundation can be overcome.       


2013 ◽  
Vol 11 (1) ◽  
Author(s):  
Ir. Ernawan S, MT ◽  
Yuda Al Qadr Latief

Ernawan S.1) , Yuda Al Qadr Latief2)1,2) Jurusan Teknik Sipil Universitas Muhammadiyah MalangAlamat korespondensi : Jl. Raya Tlogomas 246 Malang 65144AbstractHydrological conditions in Indonesia and elsewhere is typical, so not all the way and all the concepts can be used to solve the problem of hydrology in Indonesia, especially in the Upstream Brantas River precisely in Sub Watershed of Metro. Rain is an important input component in the hydrological processes. Rainfall characteristics of which are the intensity, duration, depth, and frequency. Intensity related to the duration and frequency can be expressed by curves Intensity-Duration-Frequency (IDF). IDF curves can be used to calculateflood plan to use a rational method.In this study, daily rainfall calculated by frequency analysis begins by determining the mean maximum daily rainfall, then calculate statistical parameter to choose the most suitable distribution. The time is long dominant rainfall event with the greatest frequency of rain events. The intensity is calculated by using the data of observation.Based on the analysis of the frequency of the rain turns to design return period 2, 5, 10, 20, 50 and 100 years in a row is 49; 70; 86; 111; 132 and 155 mm. The results showed that the amount of time the dominant rain events between 4-8 hours. IDF curves in sub watershed of Metro based on the data observations generally showed a pattern where the rainfall is always preceded by a high intensity then progressively decreases. Besides the greater the return period tend to have higher rainfall intensity. The results of this research could bedeveloped even if it may be modified in accordance with the specific conditions subwatershed of Metro.


2021 ◽  
Vol 884 (1) ◽  
pp. 012018
Author(s):  
I G Tunas ◽  
H Azikin ◽  
G M Oka

Abstract Extreme rainfall is the main factor triggering flooding in various regions of the world including Indonesia. The increase in intensity and duration of current extreme rainfall is predicted as a result of global climate change. This paper aims to analyze the impact of extreme rainfall to the peak discharge of flood hydrographs at a watershed outlet in Palu, Sulawesi, Indonesia. Maximum daily rainfall data for the period 1990-1999 recorded at the Palu Meteorological Station, Central Sulawesi were selected using the Annual Maximum Series Method, and grouped into two types. Type I is the maximum daily rainfall data with extreme events and Type II is the maximum daily rainfall data without extreme events. Frequency analysis was applied to the two data groups using the best distribution method of: Normal, Normal Log, Pearson III Log, and Gumbel to obtain the design rainfall of each data group. In the next stage, the design rainfall transformation into a flood hydrograph is performed using the Nakayasu Synthetic Unit Hydrograph based on a number of return periods in one of the rivers flowing into Palu Bay, namely the Poboya River. The analysis results show that the design rainfall graphs with both extreme rainfall and without extreme rainfall are identical at the low return period and divergent at the high return period with a difference of up to 21.6% at the 1000-year return period. Correspondingly, extreme rainfall has a greater impact at the peak of the flood hydrograph with increasing return periods ranging from -1.28% to 26.81% over the entire return period.


2018 ◽  
Vol 38 (1) ◽  
pp. 67-74
Author(s):  
Faiza Lallam ◽  
Abdesselam Megnounif ◽  
Abderrahman Nekkache Ghenim

AbstractThe runoff coefficient (RC) is a parameter that is very often used in surface hydrology in order to characterize the drainage capacity of a watershed. The traditional estimate of this coefficient is often made from abacuses based on 2 or 3 parameters to the maximum. In this work, three numerical models are presented. Two models are based on experimental work. The first one is based on three criteria, namely the vegetation cover, the type of soil, and the slope. The second one considers the size of the watershed, the maximum daily rainfall and the type of soil. In practice, it is not easy to estimate the coefficient of runoff by simultaneously considering the influence of several criteria. In order to overcome this problem, a third model is developed and presented; it allows capitalizing the information from the first two models mentioned above. The objective of the present work is to be able to verify the comparability of these criteria and to assess the relative importance of each of them.


MAUSAM ◽  
2021 ◽  
Vol 68 (1) ◽  
pp. 161-168
Author(s):  
VIVEKANAND SINGH ◽  
ANSHUMAN SINGH

In this paper, the variation of temperature and rainfall at Patna are analysed using simple non-parametric tests. The trends in the annual maximum and minimum daily temperatures, annual rainfall, annual maximum daily rainfall, number of rainy days in a year, the annual average rainfall per rainy day and the ratio of maximum to average rainfall per rainy day at Patna have been examined. Tends in total monthly rainfall, Highest daily rainfall in a month and number of rainy days in a month have also been determined for every month in a year. The monthly trends of data using simple Mann-Kendall test indicated statistically significant changes in rainfall pattern for the city.


2021 ◽  
Vol 14 (2) ◽  
pp. 507
Author(s):  
Maria Suzete Sousa Feitosa ◽  
Jonas Alves Da Silva Neto ◽  
Hikaro Kayo De Brito Nunes

R E S U M OO presente estudo tem como objetivo analisar, sob a utilização de notícias de jornal como procedimento metodológico, as enchentes do rio Poti na cidade de Teresina/Piauí, durante os episódios de 1985, 1995 e 2009. Metodologicamente, adotou-se: conhecimentos teóricos do Sistema Socioambiental Urbano; análise dos dados diários de chuva no período de 30 anos (1981 a 2010) manipulados pelo balanço hídrico climatológico; utilização de notícias de jornal (jornal O Dia e TV Cidade Verde); e, por fim, análise interpretativa. Dessa forma, em 1985 registrou-se o maior volume de precipitação naqueles últimos vinte anos, como expressa a capa do O Dia sobre a maior enchente dos últimos dez anos. No episódio de 1995, o Jornal O Dia destacou que após 20 dias consecutivos de chuvas o rio Poti ultrapassou em 6 metros a cota normal, em decorrência principalmente dos temporais à montante. Já no episódio de 2009, a imprensa local destacou que as chuvas são as maiores desde 2001 resultando no decreto de emergência na capital associado aos eventos pluviométricos intensos no período de janeiro a abril correspondendo a 87,7% do esperado para todo o ano. Destarte, o cruzamento de informações técnico-científicas e aquelas de notícias de jornal possibilitou compreender o processo de adensamento urbano, as dinâmicas das chuvas e como tal relação se comportou ao longo da faixa temporal, o que legitima uma série de construções e ressignificações da memória relacionando chuva, dinâmica do rio Poti e população ribeirinha.Palavras-chave: Chuva, Rio, Jornal, Episódio, Desastre, Teresina.                                                                                                                                 Newspaper stories as a methodological procedure for episodic analysis (1985, 1995 and 2009) of the Poti river floods in Teresina – Piauí A B S T R A C TThis study aims to analyze, in the use of newspaper reports as a methodological procedure, the flooding of the river Poti in the city of Teresina / Piauí, during episodes of 1985, 1995 and 2009. In terms of methodology was adopted: theoretical knowledge System Social-Environmental Urban; analysis of daily rainfall data in the 30-year period (1981-2010) handled by the climatic water balance; use of newspaper reports (newspaper O Dia and TV Cidade Verde); and finally, interpretative analysis. Thus, in 1985 it was the one that registered the highest volume of rainfall in those last twenty years, as expressed the cover of O Dia of the greatest flood of the past ten years. In episode 1995 Jornal O Dia pointed out that, after 20 consecutive days of rain the Poti river exceeded 6 meters in the normal quota, mainly due to the time upstream. Already in the episode, 2009 local media pointed out that rainfall is the highest since 2001 resulting in the emergency decree in the capital associated with intense rainfall events in the period from January to April corresponding to 87.7% of the expected full-year. Thus, the intersection of technical and scientific information and those of newspaper news possible to understand the urban densification process, the dynamics of rainfall and how this relationship behaved along the temporal range, which legitimizes a number of buildings and reinterpretation of memory relating rain, dynamics and Poti river local population.Keywords: Rain, River, Newspaper, Episode, Disaster, Teresina.


2018 ◽  
Vol 44 ◽  
pp. 00184
Author(s):  
Katarzyna Wartalska ◽  
Marcin Wdowikowski ◽  
Paweł Wilk ◽  
Michał Oktawiec ◽  
Bartosz Kaźmierczak

The paper presents rainfall conditions for the city of Wroclaw (Poland) in the multi-annual period 1960–2017. A decreasing tendency of annual precipitation totals on the level of –12.5 mm/decade and decreasing trend of the monthly total in November of –2.9 mm/decade has been shown. In remaining months, no statistically significant change trends were observed. The maximum daily rainfall amounts were recorded in summer months: 56.4 mm in June, 74.4 mm in July and 67.5 mm in August. The analysis of variability in the number of precipitation with daily amounts exceeding 10 mm showed statistically significant decreasing trends – a decrease in the number of days in the amount of 0.69 per decade (linear regression). In the case of rainfall exceeding 20 mm and 30 mm no statistically significant trends were noted – the number of days with such heavy precipitation is practically constant and amounts to an average of 3.84 and 1.44 precipitation per year.


2019 ◽  
Vol 5 (1) ◽  
Author(s):  
Nur Afifah Sari ◽  
Etih Hartati ◽  
M. Candra Nugraha

<p class="IJOPCMKeywards">Based on the hydrological cycle, one of the main water sources is rainwater. weather or climate conditions that occur will greatly affect the nature and condition of a rain or rainy season. On a global scale, the existence of water naturally is constant, only occurs in variations both in time and space on a regional scale. Analysis of the rainfall characteristics of Pantai Indah Kapuk (PIK) residential and commercial areas 2  Cluster "C" in Tangerang Regency, Banten Province, is for to find out the intensity of rainfall used for drainage planning. The daily rainfall data used includes 5 rain catching stations with a duration of 25 years (1994 - 2018). The Van Breen method is used to process rainfall data within a certain period into rainfall intensity with various times for drainage planning used. In the planning of drainage channels the rainfall return period used is PUH 2 for tertiary lines with selected rainfall data of 192 mm / day and PUH 5 for secondary lines with selected rainfall data of 219 mm / day. The IDF curve shows that rainfall intensity is affected by the time and return period of rainfall, where the shorter the rainfall time and the greater the return period of rainfall, the higher the intensity of rainfall produced.</p>


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