scholarly journals Construction, operation, and maintenance of rubber dams

2002 ◽  
Vol 29 (3) ◽  
pp. 409-420 ◽  
Author(s):  
X Q Zhang ◽  
P W.M Tam ◽  
W Zheng
Keyword(s):  
Flood Control ◽  
Management Practices ◽  
Hydraulic Structure ◽  
Hydraulic Structures ◽  
Maintenance And Repair ◽  
Rubber Dam ◽  
The Past ◽  
Operation And Maintenance ◽  
Construction Operation ◽  
Rubber Dams

Rubber dams are inflatable and deflatable hydraulic structures. Thousands of rubber dams have been installed worldwide for various purposes: irrigation, water supply, power generation, tidal barrier, flood control, environmental improvement, and recreation. Furthermore, rubber dams have been used in cold areas where the temperature is as low as – 40°C. The simplicity and flexibility of the rubber dam structure and its proven reliability are key considerations in its wide scope of applications. Based on the management practices of 20 rubber dams in Hong Kong in the past 35 years, interviews with rubber dam experts and practitioners, and the investigation to the construction of a recent rubber dam, this paper provides a detailed discussion on various issues related to the construction, operation, maintenance, and repair of rubber dams.Key words: construction, hydraulic structure, maintenance, operation, repair, rubber dam.

A Preliminary Discussion of Build Rubber Dam in Bayi Linzhi’s Fuqing River

2014 ◽  
Vol 638-640 ◽  
pp. 726-730
Author(s):  
Xin Wei Song ◽  
Zhi Xiang Cao ◽  
Fang Chao Chen
Keyword(s):  
Water Quality ◽  
Hydraulic Structure ◽  
Low Cost ◽  
Economic Benefits ◽  
Ecological Environment ◽  
Construction Period ◽  
Rubber Dam ◽  
Rubber Dams ◽  
Good Environment ◽  
The City

Rubber dam is a type of soft shell hydraulic structure, which is rechargeable and scalable. Relative to other hydraulic structure that has the same function, rubber dam has many advantages, low cost, short construction period, simple to operation and maintenance, and long service life. Rubber dam is now widely used in industrial and agricultural production, which have improved the ecological environment and cityscape. The Fuqing River, whose water is stench, dirty, have been seriously affecting the city appearance. This paper discusses on construction three-level cascade rubber dam in the Fuqing River to improve the water quality. Build those rubber dams project on the Fuqing River, which not only improve the water quality, beautify the environment, improve the urban ecological environment, create good environment for residents living, can also create social and economic benefits.

Selection of design flood frequencies for hydraulic structures

1993 ◽  
Vol 20 (4) ◽  
pp. 582-586
Author(s):  
C. D. Smith
Keyword(s):  
Key Words ◽  
Hydraulic Structure ◽  
Flood Frequency ◽  
Hydraulic Structures ◽  
Practical Reasons ◽  
Design Flood ◽  
The Past ◽  
Design Discharge ◽  
The Cost ◽  
Selection Of

The first step required in the design sequence for a hydraulic structure is selection of the design discharge. The size and cost of the structure will be directly related to the magnitude of this value. If the selected discharge is too large, the structure will be uneconomic; if it is too small, it will be unsafe. The optimum design corresponds to the point where the cost of the structure and the cost of exceeding the design discharge is a minimum. Ideally, the optimizing process should be carried out for each structure. For practical reasons it is not always possible to do this. In such cases, design flood frequencies are used which have apparently been satisfactory for similar structures in the past. Some typical flood frequency values for various structures are given in this paper, along with the rationale for differences in values for different kinds of structures. Key words: design floods, frequency, economics, hydraulic structures.

scholarly journals The planning and funding of road infrastructure via PPPs

2014 ◽  
Author(s):  
John Gardiner
Keyword(s):  
Private Sector ◽  
Government Funding ◽  
Road Infrastructure ◽  
The Past ◽  
Operation And Maintenance ◽  
Substantial Risk ◽  
Construction Operation

The shortfall in the funding for construction, operation and maintenance of road infrastructure in Australia is substantial and future investment appears to be beyond the capabilities of government funding alone. In the past, the private sector has proven very willing to invest in PPPs with government to provide road infrastructure and, overall, its performance in relation to construction, operation and maintenance has been far superior to that of government and has relieved government of substantial risk. However, it is unlikely that the private sector will accept the same levels of risk on new PPPs as in the past.

Management of rubber dams in Hong Kong

1999 ◽  
Vol 26 (2) ◽  
pp. 123-134 ◽  
Author(s):  
Paul Wing Ming Tam ◽  
Xue-qing Zhang
Keyword(s):  
Hong Kong ◽  
Technological Innovation ◽  
Stainless Steel Mesh ◽  
Technological Breakthrough ◽  
Rubber Dam ◽  
Dam Management ◽  
Major Disadvantage ◽  
Maintenance Work ◽  
Construction Operation ◽  
Rubber Dams

The rubber dam is a relatively recent technological breakthrough. It was introduced to Hong Kong in the early 1960s. To date, a total of 20 rubber dams have been installed in Hong Kong. Most of the dams are used to impound water for irrigation. Due to its inflatable and deflatable characteristics, the rubber dam is excellent for flood mitigation and environmental protection. When a dam is inflated, it blocks water. When the river level reaches a preset value, the dam deflates automatically and the flood risk is reduced. Furthermore, silt deposits, debris, garbage, and animal wastes behind the dam can be removed by regular deflation. Much of the maintenance work required for rubber dams is related to punctures, which are simple to repair. The vulnerability of a rubber dam to damage by sharp objects or vandalism is the major disadvantage. Ceramic chips coating and stainless steel mesh have been used to strengthen the dam body against damage by sharp objects. Continual technological innovation is vital to the improvement of rubber dam performance. This paper highlights the various issues connected with rubber dam applications in Hong Kong, including procurement, construction, operation, maintenance, problems, and countermeasures.Key words: rubber dam, management, technological innovation, application, construction, operation, maintenance.

METHODS OF FORECAST CALCULATION OF GROUND WATER BACKWATER IN THE ZONE OF HYDRAULIC STRUCTURES INFLUENCE

2020 ◽  
pp. 109-116
Author(s):  
N.P. KARPENKO ◽  
◽  
M.A. SHIRYAEVA
Keyword(s):  
Numerical Model ◽  
Computer Program ◽  
Ground Water ◽  
Programming Language ◽  
Hydraulic Structure ◽  
Hydraulic Structures ◽  
Software Model ◽  
Computational Program ◽  
Specific Object ◽  
Zone Of Influence

The purpose of the work is to consider methods for calculating the forecast of groundwater backwater in the zone of influence of hydraulic structures. The analysis of analytical dependences of calculation of the forecast of groundwater backwater for various calculation schemes is carried out. For a homogeneous scheme of the geofiltration structure, a numerical model is proposed and a computational program for calculating the groundwater backwater is developed. It allows calculating the groundwater backwater from the channel at any time in the discrete mode. To simplify the solution of the problem of calculating the groundwater backwater, a computer program was created in the programming language Phyton Version 8.3 which quickly solves this hydrogeological problem. A possible range of geofiltration parameters is proposed for calculating the groundwater backwater near main channels. The adaptation and implementation of the software model was carried out for a specific object – the Bolshoy Stavropol channel-5, for which forecast calculations were made. The results of predictive calculations of groundwater backwater are the basis for the assessment of areas of possible flooding – the territory within which the level of ground water increases as a result of their backup by a hydraulic structure.

The Effect of Cutoffs on the Uplift Pressure Beneath the Hydraulic Structures Floor

2018 ◽  
Vol 6 (3) ◽  
pp. 20-28
Author(s):  
Faisal Al Tabatabaie ◽  
Dhabia Sabeeh Al Waily
Keyword(s):  
Potential Energy ◽  
Hydraulic Structure ◽  
Hydraulic Structures ◽  
Outer Face ◽  
Analogue Model ◽  
Electrical Analogue ◽  
Uplift Pressure ◽  
Different Depths ◽  
The Stability ◽  
Critical Sections

The use of cutoffs underneath the hydraulic structures is considered a safe solution to ensure the stability of hydraulic structure against uplift pressure and piping phenomenon in addition to the sliding and overturning forces of the water. These cutoffs are used at critical sections underneath the floor of hydraulic structure to substitute with their depths the horizontal lengths of the creep line of the hydraulic structure base. In this paper, the experimental method- by using electrical analogue model- was carried out to plot the flow net and study the efficiency of the front and rear faces of the cutoffs for dissipating the potential energy of the percolating water underneath the floor of hydraulic structure. An electrical analogue model which was used in this study consists of twenty five models with different depths of upstream and downstream cutoffs. After plotting the flow net for all models, it is concluded that the efficiency of the inner sides are less than that of the outer sides which were investigated before in this topic of this work that both faces reduction values in the uplift pressure are considered the same, where the efficiency of the outer face of upstream cutoff is (70.35) % and for the inner face is (29.64)%, while for the downstream cutoff the efficiency for the outer face is (76.21)% and for the inner face is (23.79)% .

Chemistry of Variable Charge Soils

1997 ◽  
Keyword(s):  
Soil Pollution ◽  
Management Practices ◽  
Chemical Properties ◽  
Soil Management ◽  
Soil Productivity ◽  
Basic Difference ◽  
The Past ◽  
Variable Charge ◽  
Constant Charge ◽  
Variable Charge Soils

This book, based on research carried out at the Academia Sinica over the past 30 years, explains the basic difference between the variable charge soils of tropical and subtropical regions, and the constant charge soils of temperate regions. It will focus on the chemical properties of the variable charge soils--properties which have important bearing on soil management practices, including maximizing soil productivity and combating soil pollution.

Determinants of University Students' Waste Mobile Phones Recycling Intention

2021 ◽  
Vol 12 (1) ◽  
pp. 84-84
Author(s):  
Ho Sew Tiep ◽  
Goh Mei Ling ◽  
Radziah Shaikh Abdullah ◽  
Teo Kim Mui
Keyword(s):  
University Students ◽  
Mobile Phone ◽  
Mobile Phones ◽  
Management Practices ◽  
Policy Implications ◽  
Efficient System ◽  
The Past ◽  
Tremendous Amount ◽  
Waste Management Practices ◽  
Insight Into

As the world becomes increasingly interconnected, mobile phones has become the utmost preference device for most Malaysian to stay connected. Over the past decades, mobile phone users in this country has been increasing steadily. Percentage of individuals in Malaysia using mobile phones increased from 94.2% in 2013 to 97.5% in 2015 (DOS, 2016). According to the hand phone users survey carried out by MCMC (2017) , there were 42.3 million mobile phone subscriptions with a penetration rate of 131.2% to a population of 32.3 million at the end of 2017. In a study on university students of Malaysia, Ho et al. (2018) revealed that a substantial amount of them (18.83%) actually do not know what to do with the waste mobile phones. This reflects the low awareness amongst university students and the lack of formal management system in Malaysia. Moreover, the findings show the rate of replacements of even functioning phones is high and a significant high stockpile of the waste mobile phones, which in turn increase the generation of e-waste eventually. Tremendous amount of waste mobile phones are expected to be generated in Malaysia. Malaysia is now facing a challenge on how to deal with the ever growing generation of waste mobile phones from users. An insight into their e-waste management practices and key predictors in relation to waste mobile phones recycling intention are therefore essential. This would help to lay the foundation for developing a suitable, workable, effective and efficient system of collecting e-wastes. This study aims to probe into university students' behavioural intentions to recycle waste mobile phones. In the meanwhile, it is expected to derive the policy implications for the future expansion and enhancement of mobile phones recycling response rate. Keywords: Determinants, Mobile Phones, Recycling, Intention, University Students

The Next Generation of Service Agreements for Publicly Owned Waste-to-Energy Facilities: Pinellas County Case Study

2007 ◽  
Author(s):  
Paul J. Stoller ◽  
Anthony LoRe ◽  
William Crellin ◽  
Robert Hauser
Keyword(s):  
First Generation ◽  
Lessons Learned ◽  
Waste To Energy ◽  
Next Generation ◽  
Procurement Process ◽  
Pinellas County ◽  
The Past ◽  
Operation And Maintenance ◽  
Service Agreement

This paper discusses one of the key lessons learned from administering the first generation of service agreements for public owners of waste-to-energy (WTE) facilities over the past 22 years and how those experiences were incorporated into a new service agreement for the operation and maintenance of Pinellas County’s 24 year old, 3,000 tpd WTE Facility to better protect the county’s interests. Additionally, a major issue raised by the operating companies during the competitive procurement process for continue operation of the facility is discussed and how that concern was addressed in the new service agreement is also presented. Capitalized words or terms used in this paper are defined within the new service agreement.

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