Claim opportunity identification is the key part of claim management. This paper focuses on the application of cost and schedule analysis to international projects. Combined with theoretical analysis and case study, the paper elaborates claim opportunity identification.

The open-hole type is generally used to monitor water pressure in the body of earth-rock dam,the lag effect of water level in the hole can’t be ignored in data analysis.There are several ways in data analysis,this article sums up some ways of qualitative analysis,and describes the different represent when the dam seepage is out of the way.

This paper introduces the principle of the common camera calibration and the distortion correct of UAV images. Then it introduces the workflow of AT based on UAV images in alpine gorge region. Finally, with specific example, it discusses the technology of AT based on UAV images in alpine gorge region.

This paper analysed the formation and characteristics of100-year return flood occurred in Weigan River basin on23rd July,2002, summarizing the general situation of this flood real-time forecasting and dispatching.?

Crest settlement reservation of concrete face slab rockfill dams would effect flood prevention safety and visual image.Some dam crest elevation was found lower than design in operation as there was no settlement reservation in design, while some recorded settlement in operation exceeded the designed value as the settlement reservation in design was too small. By statistics of dams, the recorded settlement value was more than 0.1% of damheight. For enough settlement reservation in operation and good visual image of arch at middle part, settlement reservation no less than 0.5% of damheight was recommended.

By analyzing the engineering geological condition of Sanmentou soil solution cavern in Yanshiling reservoir, this paper sum up a treatment design on soil solution cavern available for diversion canal projects. The practice has shown that it can reduces the cost efficiently.

The destructive power of flood discharging rain and fog is so great that many accidents happened such as downstream traffic block, damage of electrical equipments, outage of power generators and flooding of power house.As well, penetration of the rain and fog induced large-scale downstream landslide of slope.To prevent any more damage, reasonable layout and related protection measures was critical in design, and prototype observation should be strengthened in operation． Practice showed that the reasonable opening of gate was an important non-engineering measure to decrease and prevent the influence of flood discharging rain and fog．

It is the first vast application of low-heat cement in the concrete used for construction of a 300 m super-high double curvature arch dam. Through the research and application of low-heat cement and low-heat cement concrete, the performance characteristics of concrete in the construction process have been comprehensively mastered. By giving full play to the characteristics of low-heat cement such as low hydration heat, high strength and good durability, the overall quality of concrete construction of Baihetan hydropower station has been effectively guaranteed.

Aiming at the damage and aging of underwater concrete structures, the paper introduced several reinforcement techniques, such as anti-seepage treatment at cracks, scour hole rehabilitation and et al. As well, some construction methods and materials were recommended. The techniques are effective in the reliability guarantee of structures.

To ensure the safety of its 450 hydroelectric projects, Electricite de France has used risk analysis to prioritize required maintenance. Work now underway will cost 500 million Euros (US$716 million) and help ensure the continued reliable operation of these important hydraulic structures.

Some adverse effects may bring forth to safety of the core wall rockfill dam when it is impounded for the first time, especially when the impounding speed is too fast. For example, there may be settlement increases in later stage, arching effect enhancements even cracks of the core wall, seepage deformations, instability of downstream dam slope and soaking deformations of upstream rockfill. So it is necessary to study the relation between impounding speed and the safety of dam. Based on the experience of Nuozadu core wall rockfill dam, by means of numerical calculations and analysis, in aspects of deformation, stress, hydraulic fracture, unsteady seepage and dam slope stability, safety characteristics of the dam when impounded for the first time was studied and the impounding speed was advised.

The paper summarizes and introduces the causes of defects, the classification of reinforcement materials and the classification and application of reinforcement technologies for hydraulic concrete structures. The reinforcement theory, existing standards and regulations are classified and introduced, and the prospect of reinforcement technologies are advanced.

First impounding would exert great influence on safety and stability of earth-rockfill dam, so seepage monitoring is important. According to regression analysis on seepage monitoring data of Yunpeng dam, this article analysed variation of water level and seepage. Further, the seepage operation state was appraised, to provide reference for dam operation management and completion acceptance.

The automatic monitoring system of Manwan hydropower station has been in operation for 11 years. This paper introduced the main problems in operation. Accordingly, some innovation measures were implemented and good effect was achieved.