Comparison of ArcToolbox and Terrain Tiles processing procedures for inundation mapping in mountainous terrain

2017 ◽  
Vol 11 (2) ◽  
pp. 133
Author(s):  
Andrew Darnell, MSCE, EIT ◽  
Richard Wise, MSCE, EIT ◽  
John Quaranta, PhD, PE
Keyword(s):  
Flood Control ◽  
Management Practices ◽  
Flood Damage ◽  
Dam Failure ◽  
Floodplain Management ◽  
River Systems ◽  
Processing Methods ◽  
Inundation Maps ◽  
Emergency Managers ◽  
Software Programs

Floodplain management consists of efforts to reduce flood damage to critical infrastructure and to protect the life and health of individuals from flooding. A major component of this effort is the monitoring of flood control structures such as dams because the potential failure of these structures may have catastrophic consequences. To prepare for these threats, engineers use inundation maps that illustrate the flood resulting from high river stages. To create the maps, the structure and river systems are modeled using engineering software programs, and hydrologic events are used to simulate the conditions leading to the failure of the structure. The output data are then exported to other software programs for the creation of inundation maps. Although the computer programs for this process have been established, the processing procedures vary and yield inconsistent results. Thus, these processing methods need to be examined to determine the functionality of each in floodplain management practices. The main goal of this article is to present the development of a more integrated, accurate, and precise graphical interface tool for interpretation by emergency managers and floodplain engineers. To accomplish this purpose, a potential dam failure was simulated and analyzed for a candidate river system using two processing methods: ArcToolbox and Terrain Tiles. The research involved performing a comparison of the outputs, which revealed that both procedures yielded similar inundations for single river reaches. However, the results indicated key differences when examining outputs for large river systems. On the basis of criteria involving the hydrologic accuracy and effects on infrastructure, the Terrain Tiles inundation surpassed the ArcToolbox inundation in terms of following topography and depicting flow rates and flood extents at confluences, bends, and tributary streams. Thus, the Terrain Tiles procedure is a more accurate representation of flood extents for use by floodplain engineers, hydrologists, geographers, and emergency managers.

Management of Unanticipated Extreme Flood

2018 ◽  
Vol 1 (1) ◽  
pp. 22-37
Author(s):  
Partho Das ◽  
Rezaur Rahman
Keyword(s):  
South Asian ◽  
Flood Control ◽  
Management Practices ◽  
Flood Management ◽  
Floodplain Management ◽  
Asian Countries ◽  
Future Directions ◽  
Extreme Flood ◽  
Extreme Flooding ◽  
High Topography

South Asian countries (Nepal, India, and Bangladesh) experienced extreme flooding in August 2017 which is one of the deadliest in the recent few decades. Being the downstream country of this Himalayan region Bangladesh experienced immense flooding both in its flood prone and less flood prone areas. Northwest Bangladesh district Dinajpur is known for its high topography where flooding is not a common phenomenon. Due to this reason flood control and flood management practices by concerned agencies are very rare in this region. Such negligence in river and floodplain management turned this region a vulnerable one due to flood. The unexpected August 2017 flood in Dinajpur bears an example that this region is no longer flood free. This study aims to study the insights of this August 2017 flood event bi investigating causes, flood time and after flood recovery, existing management practices and damage information etc. Based on those primary and secondary assessment, future directions for flood management in this region has been proposed.

Critical review of Terrain Tile and Google Earth: Virtual image mapping methods for floodplain management

2018 ◽  
Vol 10 (6) ◽  
pp. 433
Author(s):  
Richard Wise, MSCE, EIT ◽  
Andrew Darnell, MSCE, EIT ◽  
John Quaranta, PhD, PE
Keyword(s):  
Computer Modeling ◽  
River System ◽  
File Sharing ◽  
Google Earth ◽  
Dam Failure ◽  
Floodplain Management ◽  
Mapping Procedure ◽  
Critical Information ◽  
Inundation Maps ◽  
Response Measures

Inundation mapping is a major component of floodplain management, providing critical information as to the consequences of potential failures of flood control structures. Flood mitigation efforts rely on the creation of inundation maps to develop appropriate response measures for crisis situations, including dam failures. To develop inundation maps, a dam and river system is modeled with engineering computer programs, and a simulation of the dam failure is performed to generate data for the flood. This output data are input into other programs to develop inundation maps. Inundation maps have traditionally been produced in a paper format, but recent advances in computer modeling have provided the capability for virtual inundation maps. Virtual inundation maps offer new methods of presentation and analysis of flood impacts; thus, these mapping methods need to be investigated to determine the applications and relevance to floodplain management. The goal of this research is to advance the development and use of inundation maps by floodplain managers and emergency agencies. A simulation of a potential dam failure was performed using computer modeling for a candidate river system, and the inundation maps were created using two procedures: Terrain Tiles and Google Earth. An analysis of the strengths and weaknesses of each mapping procedure was conducted. The results indicated that the Terrain Tiles procedure has advantages in displaying critical information, such as arrival times and water depths. However, this mapping procedure is more labor intensive, and the online file sharing may not be accessible for all users. The strengths of the Google Earth procedure include two-dimensional and three-dimensional views for analysis, user-friendly file sharing, and the inclusion of built-in critical infrastructure and terrain data. Drawbacks of this procedure are that the inundation must still be generated in ArcGIS, the display of critical information is not as clear, and the online file sharing may pose security issues. Thus, the Terrain Tiles procedure should be used for the development of emergency response measures, and the Google Earth procedure should be used by emergency responders in the event of an actual emergency.

Floods as Man-made Disasters

1975 ◽  
Vol 2 (4) ◽  
pp. 257-263 ◽  
Author(s):  
Maurice D. Arnold
Keyword(s):  
United States ◽  
Flood Control ◽  
Good Reason ◽  
Cost Effective ◽  
The United States ◽  
Flood Damage ◽  
Floodplain Management ◽  
Human Occupation ◽  
Long Run ◽  
Wide Range

In the United States, the numbers of humans living on floodplains seem recently to have increased, and so probably have the annual costs of flood damage. This is despite expenditures of many millions of dollars on flood-control devices in the United States alone.The means which we use to control or contain excessive water-energy are the dam, channel, levee, sea-wall, and floodplain management. Logic and evidence, although incomplete, seem to argue against employing only structures; indeed there now seems good reason to think that structures should rarely be employed for flood-control. The case against relying solely on a structural strategy to abate floods rests on four main arguments: it is often counter-productive in that it encourages human occupation of the floodplain, thus introducing the elements of future disaster that may be more serious than if nothing had been done; it causes severe and unnecessary losses of resources; it discourages the economic use of land; and it is not cost-effective.Floodplain management, keeping the floodplain generally free from flood-control structures, is the only method which is effective in the long run. If it is planned adequately, its life is not as dependent on maintenance and upstream activity as are the structural alternatives. Moreover floodplains, when left undeveloped, are ideal and highly productive for a wide range of conservation and allied uses—including farming, parklands, open spaces, and habitats for wildlife.

scholarly journals Conjunctive operation of river facilities for integrated water resources management in Korea

2016 ◽  
Vol 374 ◽  
pp. 93-99
Author(s):  
Hwirin Kim ◽  
Cheolhee Jang ◽  
Sung Kim
Keyword(s):  
Water Resources ◽  
Flood Control ◽  
Management Practices ◽  
Integrated Management ◽  
Integrated Water Resources Management ◽  
Flood Damage ◽  
Hydro Power ◽  
Daily Water Intake ◽  
Operating Level ◽  
Floods And Droughts

Abstract. With the increasing trend of water-related disasters such as floods and droughts resulting from climate change, the integrated management of water resources is gaining importance recently. Korea has worked towards preventing disasters caused by floods and droughts, managing water resources efficiently through the coordinated operation of river facilities such as dams, weirs, and agricultural reservoirs. This has been pursued to enable everyone to enjoy the benefits inherent to the utilization of water resources, by preserving functional rivers, improving their utility and reducing the degradation of water quality caused by floods and droughts. At the same time, coordinated activities are being conducted in multi-purpose dams, hydro-power dams, weirs, agricultural reservoirs and water use facilities (featuring a daily water intake of over 100 000 m3 day−1) with the purpose of monitoring the management of such facilities. This is being done to ensure the protection of public interest without acting as an obstacle to sound water management practices. During Flood Season, each facilities contain flood control capacity by limited operating level which determined by the Regulation Council in advance. Dam flood discharge decisions are approved through the flood forecasting and management of Flood Control Office due to minimize flood damage for both upstream and downstream. The operational plan is implemented through the council's predetermination while dry season for adequate quantity and distribution of water.

Application of scenario technique in flood risk management

2007 ◽  
Vol 56 (4) ◽  
pp. 87-95 ◽  
Author(s):  
A. Winterscheid
Keyword(s):  
Risk Management ◽  
Flood Risk ◽  
Flood Control ◽  
Flood Damage ◽  
Flood Risk Management ◽  
Policy Framework ◽  
Limited Perspective ◽  
Integrated Flood Risk Management ◽  
Scenario Technique ◽  
Management Cycle

It is now commonly accepted that the management of flood risks has to be fulfilled within an integrated framework. About two decades ago flood risk was managed from a limited perspective predominantly by means of structural measures aimed at flood control. In contrast integrated flood risk management incorporates the complete management cycle consisting of the phases prevention, protection and preparedness. In theory it is a well described concept. In the stage of implementation, however, there is often a lack of support although a consistent policy framework exists. Consequently, the degree of implementation must be rated as inadequate in many cases. In particular this refers to the elements which focus on preparedness and prevention. The study to which this paper refers emphasises the means and potentials of scenario technique to foster the implementation of potentially appropriate measures and new societal arrangements when applied in the framework of integrated flood risk management. A literature review is carried out to reveal the state-of-the-art and the specific problem framework within which scenario technique is generally being applied. Subsequently, it is demonstrated that scenario technique is transferable to a policy making process in flood risk management that is integrated, sustainable and interactive. The study concludes with a recommendation for three applications in which the implementation of measures of flood damage prevention and preparedness is supported by scenario technique.

scholarly journals Assessment of the community vulnerability to extreme spring floods: the case of the Amga River, central Yakutia, Siberia

2020 ◽  
Author(s):  
N. I. Tananaev ◽  
V. A. Efremova ◽  
T. N. Gavrilyeva ◽  
O. T. Parfenova
Keyword(s):  
Rural Areas ◽  
Flood Control ◽  
Management Practices ◽  
Snow Water Equivalent ◽  
Risk Mitigation ◽  
Control Structures ◽  
Ice Jam ◽  
Central Yakutia ◽  
Urban Settlements ◽  
Water Stage

Abstract Spring floods in Siberia annually affect local communities. Major urban settlements in the region implemented flood control structures, so rural areas take a heavy beating. In 2018, spring floods severely hit multiple communities in central Yakutia, exposing deficient flood prevention and risk management practices. Notably, Amga village, an important local center, was severely inundated. Hydrological analysis shows that the 2018 flood had a 50-yr return period, and was caused by an ice jam in a nearby channel bend where mid-channel sand bars impede ice movement during breakup. The cold spells of late April and early May in the middle section of the river promote ice-jam development, causing extreme water stage rise. Highest water stage is unrelated to either winter snow water equivalent or early May rainfall. Estimated tangible direct damage to the Amga community equals 5.1B ($81.5M) in 2018 prices, but only 0.13B ($2.1M), or 2.5% of this total, was reclaimed. A questionnaire survey revealed that most residents report important deterioration of drinking water quality and health after flooding. Residents respond positively to risk mitigation actions, implemented by the local and regional authorities, except ice dusting and cutting, and report minor activity of official sources in spreading information on flood progress.

Optimal coordination strategies for flood control and hydropower generation of reservoir

2020 ◽  
Author(s):  
Lin Zhang ◽  
Wei Ding ◽  
Guoli Wang
Keyword(s):  
Water Level ◽  
Flood Control ◽  
Flood Damage ◽  
Hydropower Generation ◽  
Two Stage ◽  
Forecast Uncertainty ◽  
Streamflow Forecast ◽  
Trade Offs ◽  
Water Head ◽  
Optimal Coordination

<p>During flood seasons, the water head of the reservoir is kept in flood limited water level (FLWL) to satisfy the flood control objective, but this runs counter to the need for hydropower generation to maintain a high water-head. This paper focuses on the optimal hedging rules by setting an appropriate FLWL to maximize the benefit of hydropower without increasing the flood damage and raise the water level at the end of flood for non-flood season/future use. Two-stage hydropower functions considering the constraint conditions which include the downstream environmental flow and installed capacity are built. On the basis of studying the marginal utilities of the two-stage hydropower functions, the competitive and collaborative relationships between flood damage and hydropower benefit were analyzed qualitatively. A two-stage reservoir operation model with two objectives that are minimum flood damage and maximum hydropower generation is developed, which considers streamflow forecast uncertainty and acceptable flood risk. The derived OHR from the model can be used to make trade-offs between flood damage and hydropower benefit under different levels of streamflow forecast uncertainty or acceptable risk. Finally, the analysis is applied to the Nierji Reservoir in the north of China. The results indicate that the OHR can increase hydropower generation 1.57x106kw·h and decrease the volume of abandoned water30.04x106m3 average annual.</p>

GIS Application in Analysis of Flood Inundation

2013 ◽  
Vol 274 ◽  
pp. 496-499
Author(s):  
Ya Qiu Liu ◽  
Chen Hui Zhang ◽  
Xiao Peng Zhang
Keyword(s):  
Damage Assessment ◽  
Flood Control ◽  
Flood Damage ◽  
Ecological Environment ◽  
Flood Inundation ◽  
Gis Application ◽  
Simulation Performance ◽  
Digital Elevation ◽  
Control Decision ◽  
Elevation Model

Flood disaster affects the development of our national economy seriously and made people’s life and property in danger. It also destroyed our ecological environment. In this paper, a model which is based on the geographic information system (GIS) has been introduced with the flood submerging range and submerging algorithm. Experimental results with Xi-tiao-xi area flood region using of digital elevation model (DEM), provides that it is possible to make a rapid flood damage assessment and scientific flood control decision service. The simulation performance is accurate and rapid.

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