Essay on Flood Study

Submitted By sandy28684
Words: 521
Pages: 3
Open Document
Joint Probability Approach to Design Flood Estimation: Sensitivity of Model Parameters
Hitesh Patel
(BE Chemical, Grad Dip Environmental Engineer)
MEng (Honours) Candidate
Principal Supervisor: Dr Ataur Rahman
Co-supervisor: A/Prof Chin Leo
School of Engineering
University of Western Sydney, Penrith Campus (Kingswood)

Background:

Rainfall-based flood estimation method is often adopted when a complete design hydrograph is required and/or in the situations where the recorded streamflow data are not long enough to characterize the underlying at-site flood frequency distribution with sufficient accuracy. The Design Event Approach (DEA) is currently recommended rainfall-based flood estimation method in Australia according to Australian Rainfall and Runoff – the national guide to flood estimation. However, DEA does not account for the probabilistic nature of the key flood producing variables except for the rainfall depth. This arbitrary treatment of key inputs and model parameters in DEA can lead to inconsistencies and significant bias in flood estimates for a given average recurrence interval (ARI). A significant improvement in design flood estimates can be achieved through a Joint Probability Approach (JPA), which is more holistic in nature that uses probability-distributed input variables/model parameters and their correlations to obtain probability-distributed flood output. More recently, there have been notable researches in Australia on Monte Carlo simulation technique (MCST) for flood estimation based on the principles of Joint Probability that can employ many of the commonly adopted flood estimation models and design data in Australia and have demonstrated significant promise with the JPA. However, all previous study has considered rainfall duration, rainfall intensity, rainfall temporal pattern and initial loss as random variable input in the model but the probabilistic nature of key runoff routing model storage delay parameter k has been disregarded, which in some circumstances is likely to cause underestimation or overestimation of design flood peaks. Recently, the National Committee on Water Engineering in Australia has resolved that MCST should replace the DEA as the preferred method of flood hydrograph modeling in Australia.

Objective of the research:

The objective
Show More

Related Documents: Essay on Flood Study

Hydrograph In The Kali Gandaki River

water might impact greatly in the socioeconomic development of Nepal by means of money and life which is also described by the figure 4.22. Figure 4.22: Flood and landslide disasters in Nepal due to induced climate change (Khanal, 2005) 4.8 Impacts on Droughts Dry season flow (January-April) is the best suitable time for the drought study. However, in the drought analysis 120 days daily record of flow in the Kali Gandaki river have analyzed and below the mean (μ) and standard deviation (σ)…

Words 1114 - Pages 5

8 comparing social and economic impacts Essay examples

(1-6 marks) Describes the social and/or economic effects of flooding. Information likely to be generic – case study named only. Some similarities/differences apparent at top end. Separate accounts. Level 2 (7-12 marks) Description of effects of floods is more specific and precise – begins to distinguish between social and economic or this is implicit. Information relates to case studies – ‘rings true’ – some support. Begins to comment – may be tentative/implicit. May be imbalanced to one area and/or…

Words 510 - Pages 3

Social: Emergency Management and Flood Control Essay

manage floods and the risks of flood-related disasters. The research aims to understand how various laws, policies, programs and procedures for managing floods and the risks of flood-related disaster came about and how they have performed. It further examines the capacity to mobilize and coordinate resources as well as deliberate, negotiate, monitor and evaluate the formal institutions from the national to local level. Focusing the analysis on institutional changes and river-based flood events…

Words 9518 - Pages 39

Essay On Smart City

south of Surat. The average annual flood, with a recurrence interval of 2.35 years, on the Tapi is 14,328 m³/s. The flood in 2006 alone had caused total damage city was flooded in 2006, with a peak discharge of approximately 25,785 m³/s from the Ukai Dam. The flow capacity of the Tapi has been reduced in Surat city due to rapid industrialization/urbanizations and severe encroachment of the floodplain. For example, a discharge of rarely 25,775 m³/s during the flood in 2006 had attained a level of…

Words 963 - Pages 4

The Issue Of Violence

With regard to violence men are predominately seen as the problem so they should also be seen as part of the solution (Flood, 2001; Berkowitz, 2004). Not to say that woman cannot be violent but figures for Australia and worldwide indicate there is a 90% chance that if an incident of violence is recorded the fact is it will predominantly be a male who is the perpetrator (Flood, 2011; Hautzinger, 2003). Discovering why men are more prone to violence has seen decades of discourse and research surrounding…

Words 3179 - Pages 13

The Peruvian Amazon Floodplains

Ch.1 Introduction 1.1 Introduction The river dynamics in Amazon floodplains of northeastern Peru contribute to socio-economic and natural environments characterized by dynamism and uncertainty (Pinedo-Vasquez et al., 2002). The ‘flood pulse’ exerts a profound influence on the land resources driving the floodplain system and strongly determining environmental conditions and local livelihoods (Winklerprins, 1997; Junk, 2001; Glouding et al., 1996). The most fertile soils of the Amazon Basin are along…

Words 1658 - Pages 7

Coastal Flooding Essay

Coastal Flooding: 1953 Storm Surge Case Study The Storm was a major flood caused by a heavy storm that occurred on the night of Saturday, 31 January 1953 and morning of Sunday, 1 February 1953. The floods struck the Netherlands, Belgium, England and Scotland. A combination of a high spring tide and a sever European Windstorm over the North Sea caused a storm tide, which therefore overwhelmingly surpassed sea defences and causes rapid and wide flooding. A maximum gust was identified as 126mph at…

Words 553 - Pages 3

Noah ' s Ark Essay

onboard of the ark throughout the flood have returned to dry land. The Lord has wiped all of mankind and every animal off the face of the Earth. After the Lord alerts Noah that they can return to “land”, he tells Noah to build an alter and make burnt offerings. In this passage, the Lord blesses Noah and his sons and promises them a life without another flood to destroy the entirety of land and humankind. The Lord starts with a call for a new beginning, life post flood that must be different than life…

Words 936 - Pages 4

boscastle flood summary Essay

BOSCASTLE FLOODS: CASE STUDY Location: Boscastle, N. Cornwall; Rivers Valency & Jordan Date: 16 August 2004 Causes: immediate: a flash flood following fall of 50mm rain in one hour, 125mm in a few hours; this resulted from warm moist air moving onshore meeting air moving overland from the SW ~ air was forced to rise rapidly,– as air rose, and it rained heavily. Causes: other: A very wet August (2 times average rain) meant that the ground was already saturated; water couldn’t be absorbed…

Words 361 - Pages 2

Nature Or Myth: Reality Or Myth

REALITY OR MYTH RELS 103 Old Testament Studies February 15, 2012 God first created the world and saw that all of it was good. “In the beginning God created the heavens and the earth. Now the earth was formless and empty, darkness was over the surface of the deep, and the Spirit of God was hovering over the waters…God saw all that he had made, and it was very good”1. It is seen within the first two chapters of the Bible that God created all things from land to sea…

Words 1264 - Pages 6