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Articles by C.R. Suribabu
Total Records ( 5 ) for C.R. Suribabu
  V. Rathinakumar , G. Dhinakaran , C.R. Suribabu and P. Velmurugan
  Air entrainment at the hydraulic structure is considered as one of the economical means of air-water transmission of atmospheric gases such as nitrogen and oxygen. The content of Dissolved Oxygen (DO) in the water helps to assess the quality of water. Enhancing the DO level in water course helps in the survival of terrestrial animals, fish and other aquatic organisms. More over, oxygen is needed for all algae, macrophytes and also for numerous chemical reactions that are vital for stream and lake functioning. Air-water transfer process can be administrated in the natural flowing channel by providing appropriate stepped cascade according to the site condition and availability of driving head for flow. The change in form of energy at the cascade and subsequent formation of turbulence in the flow at the immediate vicinity of downstream side of structure creates entrainment of air to water. This study describes the experimental investigation on the water aeration process at stepped cascade aerator with constant slope for different water quality flow. Large size stepped cascade aerator model is constructed in the laboratory to test its performance for three distinct qualities of water. The data is obtained for different step sizes by keeping slope as constant.
  C.R. Suribabu and T.R. Neelakantan
  Most of water supply infrastructures were put in place during India’s independence period and some pipelines are over 70 years old. Ageing and uncertainty on its performance under increased and varying demand pattern puts tremendous pressure on water authorities to rehabilitate the existing system for complete revamping the system. Complete revamping does not only mount the cost to the water authority but also makes potential inconvenience to the consumer in terms of getting new connection with new line. Hence, it is essential to rehabilitate the pipes which are more sensitive in serving the locality. Rehabilitating the existing system is generally done by either replacing the existing pipes with same or higher diameter or laying parallel pipe with existing. The optimal selection of such a combination is a furious task to water authorities. In the present study, a combined simulation-optimization modeling approach is developed using EPANET simulation engine. Differential evolution algorithm is adopted to arrive at the optimal solution. The demonstration proves that if the required data are available, the rehabilitation and expansion can be performed in an optimal manner using the model presented.
  Nikhil Agarwal , S. Sree Ram and C.R. Suribabu
  The piers to the bridge are very important component for the stability of bridge structure. These piers need to be placed within the channel width in addition to the abutment wall on either side of water ways. This arrange in the bridge structure obstruct the flow and may cause an increase in water level on upstream side of the bridge. This increase in water level is termed as afflux and this afflux may create adverse impact on the stability of bridge and responsible for scouring action around the bridge pier especially during flood flow. In the present work, the drag characteristic of bridge piers with respect to its shape is studied. Rectangular model with triangular nose and tail shaped pier models are made for various aspect ratios with constant contraction ratio of 0.4. The experiment is conducted for sub-critical flow conditions in a flume having rectangular flow section. The afflux, drag force and coefficient of drag are calculated for different discharge values and their variations with respect to Froude number are studied. On comparing the experimental results with the Yarnell’s formula, the most widely used empirical equation for calculation of backwater rise; it was found that the Yarnell’s equation gives over estimated results. In the present study, a different shape co-efficient value (K) with respect nose dimension is determined and suggested. This new K value can be used for triangular shaped bridge piers having a various aspect ratio. It was found that the rise in water level due to bridge pier is a function of aspect ratio, pier shape and Froude number.
  T.R. Neelakantan , D. Rammurthy , Shaun T. Smith and C.R. Suribabu
  Giving face lift to the existing system to meet out increased demand or introducing the new water supply scheme by discarding the existing one needs complete study on feasibility of rehabilitation in a scientific and cost effective manner. This paper addresses certain issues pertaining to the optimal upgradation and expansion of existing water distribution system. A comparative study of existing system from a town in India is presented for the design of water supply system using present design practices and an optimal design method. The attempt has been made using hydraulic simulation along with differential evolution based optimisation module. It is proved that optimisation method is useful for the expansion and upgradation design of drinking water systems. For overall effective management of a water supply scheme, the operational management issues are also discussed along with the suggestions.
  Madhumitha S. Vel , Nikhil Agarwal , R. Dinesh and C.R. Suribabu
  An economic design of water distribution system components plays an important role in the water-supplying agency due to requirement of large financial investment on construction, operation and maintenance. Due to rapid growth of population and urbanization, inadequacy of source, the old water distribution networks are in detrimental condition to meet the growing demand. This posed a challenging problem to municipal engineers in taking decision on rehabilitation or revamping the existing network within the available fund. The effective construction of a distribution network heavily depends on the design, directly influencing the financial investment required. The time factor plays a critical role in securing initial sanctions for commencing a project. This study proposes a spatial approach for preparation of preliminary estimate for the design of real water distribution network. The pipe network layouts for the study area are prepared using satellite imagery and pipe sizing is done by proposed Heuristic approach. Segment-wise population is estimated. The demand to be met by each pipe network is estimated and projected for future population growth. Heuristic concept is employed to determine the near-optimum size of the network pipes. Spatial approach results in quick and easy determination of population and thus can be used for preparing a preliminary estimate facilitating quick financing. The proposed Heuristic approach gives a practical and nearly economical solution in designing a water distribution network.
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