scholarly journals Short-Term Reservoir Optimization for Flood Mitigation under Meteorological and Hydrological Forecast Uncertainty

2015 ◽  
Vol 29 (5) ◽  
pp. 1635-1651 ◽  
Author(s):  
Dirk Schwanenberg ◽  
Fernando Mainardi Fan ◽  
Steffi Naumann ◽  
Julio Issao Kuwajima ◽  
Rodolfo Alvarado Montero ◽  
...  
Keyword(s):  
Flood Mitigation ◽  
Short Term ◽  
Forecast Uncertainty ◽  
Reservoir Optimization ◽  
Hydrological Forecast

Significance of reservoir operation during extreme rainfall event in flood mitigation and water demand management in a metropolitan city of India: a case study

2020 ◽  
Author(s):  
Anandharuban Panchanthan ◽  
Michele La Rocca ◽  
Elango Lakshmanan
Keyword(s):  
Water Supply ◽  
Water Demand ◽  
Reservoir Operation ◽  
Extreme Rainfall ◽  
Flood Mitigation ◽  
Extreme Rainfall Events ◽  
Rainfall Events ◽  
Reservoir Storage ◽  
Time To Peak ◽  
Initial Storage

<p>Increasing water demand and climate change poses a great challenge in managing water resources availability. Reservoir operation during heavy rainfall events in an urbanized region is crucial in terms of decision making. The objective of this study is to assess the significance of reservoir operation during extreme rainfall events on flood mitigation and future domestic water supply. One of the major water supply reservoirs in Chennai city was chosen for this study. Rainfall record of recent four decades were analyzed and a major flood event occurred in 2015 was chosen. A combined model of hydrologic-hydraulic processes was carried out using Hydrologic Engineering Centre-Hydrologic Modelling System (HEC-HMS) and a box model based on input-output parameters. These models were calibrated and validated with historical flood events with good performance indications. Four different scenarios were framed for the analysis by targeting reduction in outflow and higher storage in the end of the event. Reducing the reservoir storage in advance and releasing with its maximum capacity at the beginning of the event will reduce the outflow from 5 to 27% and increase the time to peak by 11 to 16 hours. Available hydraulic facilities for higher storage at the end of the event were analyzed. It reveals that with the available facilities, reducing the initial storage from 75 to 50% will help to store 27 to 40% of inflow at the end of the event. Whereas the available hydraulic facilities will not allow to have a 75% of the reservoir storage at the end of this event. New gates can be provided for the safe operation during extreme rainfall events associated with the higher initial storage in the reservoir. Increased storage capacity combined with additional provisions of gates will reduce the outflow by 30% and increase the time to peak by 20 hours with the actual condition. By adapting these reservoir operation strategies, flood mitigation and fresh water augmentation during extreme events can be achieved to a significant extent. The developed combined modelling approach can be used to simulate various combinations of reservoir operations to assess the significance of timely decision on release during extreme rainfall events.</p><p>Keywords: flood mitigation, reservoir operation strategies, urban water supply, modelling</p>

scholarly journals Application of inflatable dam technology – problems and countermeasures

1998 ◽  
Vol 25 (2) ◽  
pp. 383-388 ◽  
Author(s):  
Paul WM Tam
Keyword(s):  
Hong Kong ◽  
Water Supply ◽  
Construction Material ◽  
Flood Mitigation ◽  
Low Level ◽  
Rubber Dam ◽  
The Sixties ◽  
History Of ◽  
The Many ◽  
Rubber Dams

The history of the use of inflatable dams has been a long one in Hong Kong. The first three inflatable dams were constructed in the sixties as an integral part of the Plover Cove Water Supply Scheme. Up to December 1996, a total of 16 inflatable dams had been constructed. The use of rubber as a construction material has been subject to much skepticism. There are many reasons for this and one of them is clearly the problem of durability. Despite the many problems, rubber dams have been successfully implemented in Hong Kong. Most of the rubber dams in Hong Kong had been constructed by the Agriculture and Fisheries Department, Hong Kong Government, for the replacement of polluted agricultural weirs which were still in use. A rubber dam is inflatable and deflatable; when it is inflated, it serves as an agricultural weir (low-level dam) and when it is deflated it functions as a flood mitigation device. This note reviews the problems associated with the application of the technology in Hong Kong. Some countermeasures are suggested.Key words: inflatable dams, flooding, flood mitigation, rubber, weathering, vandalism.

Enumeration and Identification of Asbestos Fibres in Water

1974 ◽  
Vol 32 ◽  
pp. 526-527 ◽  
Author(s):  
O. Mudroch ◽  
J. R. Kramer
Keyword(s):  
Water Supply ◽  
Water Samples ◽  
Drainage Basin ◽  
Lake Superior ◽  
Research Work ◽  
List Type ◽  
The West ◽  
Asbestos Fibre ◽  
Amphibole Asbestos

Approximately 60,000 tons per day of waste from taconite mining, tailing, are added to the west arm of Lake Superior at Silver Bay. Tailings contain nearly the same amount of quartz and amphibole asbestos, cummingtonite and actinolite in fibrous form. Cummingtonite fibres from 0.01μm in length have been found in the water supply for Minnesota municipalities.The purpose of the research work was to develop a method for asbestos fibre counts and identification in water and apply it for the enumeration of fibres in water samples collected(a) at various stations in Lake Superior at two depth: lm and at the bottom.(b) from various rivers in Lake Superior Drainage Basin.

Bacterial biofilm behavior in water-supply lines of dental units

1992 ◽  
Vol 50 (1) ◽  
pp. 882-883
Author(s):  
B.D. Tall ◽  
K.S. George ◽  
R. T. Gray ◽  
H.N. Williams
Keyword(s):  
Water Supply ◽  
Medical Devices ◽  
Biofilm Formation ◽  
Bacterial Biofilm

Studies of bacterial behavior in many environments have shown that most organisms attach to surfaces, forming communities of microcolonies called biofilms. In contaminated medical devices, biofilms may serve both as reservoirs and as inocula for the initiation of infections. Recently, there has been much concern about the potential of dental units to transmit infections. Because the mechanisms of biofilm formation are ill-defined, we investigated the behavior and formation of a biofilm associated with tubing leading to the water syringe of a dental unit over a period of 1 month.

The Water Supply of Lake Nicaragua

1901 ◽  
Vol 51 (1306supp) ◽  
pp. 20932-20932
Author(s):  
Angelo Heilprin
Keyword(s):  
Water Supply
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