N. Vivekanandan

• M.sc (Maths), M.Phil. (Maths),M.E. (Hydrology), MBA (HR), MA (Public Admn.), MA (Sociology), PGDCA, PGDOR, PGDSBSA, PGDPM&IR, PGDH, PGDSMA
• Researcher at Central Water and Power Research Station

Estimation of extreme rainfall for a given return period is considered as one of the important parameters for planning, design, operation and management of civil and hydraulic structures. This can be achieved by performing extreme value analysis (EVA) of rainfall that consists of fitting probability distribution to the annual maximum series of the...

Estimation of rainfall for a given return period is considered as an essential input to a hydrologic model that is used to estimate design discharge, which is needed for the planning and design of civil engineering infrastructure projects viz., roads, bridges, green highways, etc. This can be estimated by using recorded rainfall data over many stat...

Rainfall is the most important fundamental physical parameter among the climate, as this parameter determines the environmental condition of the particular region, which affects the agricultural productivity. Global warming or climate change, is one of the most important worldwide issues discussed among scientists and researchers. One of the conseq...

The estimation of rainfall for a given return period is of utmost importance for the planning and design of minor and major hydraulic structures. This can be accomplished using an extreme value analysis (EVA) of rainfall, which involves fitting a series of annual 1-day maximum rainfall data to probability distributions including the 2-parameter nor...

Prediction of rainfall has always been one of the most important issues in hydrological cycle and also essential in water resource development, planning and management of flood and drought. With the development of Artificial Intelligence (AI), a number of AI methods such as Artificial Neural Network (ANN), Adaptive Neuro-Fuzzy Inference System, Fuz...

Assessment of extreme rainfall is needed to be carried out to prevent floods and droughts and applied to the studies on water resources projects. This can be done by extreme value analysis (EVA) that consists of fitting probability distributions to the annual 1-day maximum rainfall (AMR) series. This paper presents a study on EVA of rainfall for Pu...

Peak flood discharge (PFD) for a given return period is considered as one of the most important parameters for planning and design of hydraulic structures, river protection works, and development of integrated water resources management projects. This can be achieved by adopting various methods such as flood frequency analysis, rational formula, en...

Estimation of design flood is formed as a basis for planning and management of civil engineering construction especially hydraulic structures such as water use and flood control structures. The dimensions and capacity of the buildings depend on flood magnitude for a given return period that may have some uncertainty due to model error. This can be...

Evapotranspiration is a vital parameter for irrigation planning and management, and for hydrological and climatological studies. This can be estimated by using Blaney-Criddle (BC), Thornthwaite (TW), Hargreaves (HG) and Penman-Monteith (PM) methods. Out of these methods, BC and TW are known as temperature based whereas HG is radiation based and PM...

Estimation of rainfall for a given return period is of utmost importance for planning and design of minor and major hydraulic structures. This can be achieved through Extreme Value Analysis (EVA) of rainfall by fitting Extreme Value family of Distributions (EVD) such as Generalized Extreme Value, Extreme Value Type-1, Extreme Value Type-2 and Gener...

Analysis of trend in rainfall is one of the important aspects to study about the temporal and spatial variations in nature, and assessment of extreme rainfall is a pre-requisite for planning, design and management of civil and hydraulic structures. For this purpose, Mann–Kendall (MK) test is applied for detecting a trend in rainfall data whereas Ex...

Assessment of low-flow is an important aspect for water quality management, reservoir storage design, determining minimum release policy and safe surface water withdrawals. For which, the annual minimum d-day average flow is generally adopted procedure for characterizing the low-flow in a stream, which can be obtained by averaging the flow using mo...

Estimation of rainfall and temperature for a desired return period is a prerequisite for planning, design and operation of various hydraulic structures and for evaluation of technical and engineering appraisal of large infrastructure projects. This can be computed through Extreme Value Analysis (EVA) by fitting probability distributions to the annu...

Quarter-circle Break Water (QBW) is a modified semi-circular breakwater, which are similar to caisson consists of a quarter circular surface facing incident waves, with horizontal bottom and a rear vertical wall and are generally placed on a rubble mound foundation. QBW may be constructed as emerged with and without perforations that may be one sid...

Assessment of extreme rainfall is one of the important parameters for planning, design and management of hydraulic structures at the project site. This can be obtained through Extreme Value Analysis (EVA) of rainfall by fitting of probability distributions to the data series of annual 1-day maximum rainfall. This paper illustrates the adoption of G...

Estimation of seasonal and annual rainfall for a river basin is of importance in planning and management of water resources projects. This study illustrates the use of six different parameter estimation methods for Gumbel distribution for assessment of seasonal and annual rainfall for Krishna and Godavari river basins. Goodness-of-Fit tests involvi...

Estimation of maximum flood discharge (MFD) at a desired location on a river is important for planning, design and management of hydraulic structures. This can be achieved using deterministic models with extreme storm events or through frequency analysis by fitting of probability distributions to the recorded annual maximum discharge data. In the l...

The assessment of seasonal and annual rainfall for a river basin is of utmost importance for the planning, design, and management of water resources projects. This paper compares the six parameter estimation methods of the Gumbel distribution for modelling the seasonal and annual rainfall of the Krishna and Godavari river basins. Goodness-of-Fit (G...

Rainfall intensities of various frequencies and durations are important parameters for the hydrologic design of storm sewers, culverts and other hydraulic structures. This can be achieved by the rainfall Intensity–Duration–Frequency (IDF) relationship, which is determined through rainfall frequency analysis. This paper exemplifies the use of the Gu...

The estimation of extreme rainfall for a desired return period is of utmost importance for planning, design and management of hydraulic and other structures in a region. This paper presents the methodology adopted in rainfall estimation for Hissar and Kalingapatnam regions using six parameter estimation methods of Gumbel distribution. The Kolmogoro...

Establishment and maintenance of a rain gauge network (RGN) in any geographical region is required for planning, design and management of water resources projects so as to reduce chances of project failure and to minimize the economic risk. Setting up and maintaining a RGN is an evolutionary process, wherein a network is established early in the de...

Estimation of design flood for a desired return period is of prime importance for safe design of hydraulic structures such as dams, spillways, bridges, culverts, urban drainage systems and flood plain zoning. Frequency analysis enables estimation of the probability of occurrence of a certain hydrological event of practical importance by fitting a p...

Evaluation of stream flow network in any geographical region has utmost importance for planning, design and management of water resources so as to reduce chances of project failure and also to minimize the economic risk. Setting up and maintaining a streamflow network is an evolutionary process, which is need to be reviewed and upgraded periodicall...

A robust hydrological information system is a pre-requisite for efficient water resources assessment of a region. Decision makers tend to make low use of external depositories of problem-solving water data if conditions exist by way of distance, cost, etc. which dissuade or inhibit them from seeking or using it. This is true even when users are awa...

Estimation of rainfall for a desired return period, and different durations, is often required for design of hydraulic and other structures in a region, which can be achieved by probabilistic approach. In the present study, probabilistic modelling is used to fit six different distributions to annual d-day maximum rainfall (ADMR) for different value...

Assessment of risk from natural catastrophic events is essential for engineering and land use planning. In our country among many hazards, floods assume importance because of their recurring nature, and hence managing of floods is essential to prevent the losses to property and life. Though forecasts are issued for monsoon rains, large-scale variat...

Prediction of runoff is often important for optimal design of water storage and drainage works and management of extreme events like floods and droughts. Rainfall-runoff (RR) models are considered to be most effective and expedient tool for runoff prediction. Number of models like stochastic, conceptual, deterministic, black-box, etc. is commonly a...

Irrigation planning and scheduling are essential components of water management in irrigated agriculture. For this purpose, optimal use of land and water is required for optimization of cropping pattern under a set of limitations. Number of approaches like benefit-cost, functional, programming, and simulation are commonly used for optimization of c...

Evaluation of low-flow characteristics of a river is fundamental to the assessment of water resources for many direct and indirect uses, such as, municipal, irrigation, hydropower and public water supply. Frequency analysis approach involvingfittingof'distribution to the series of annual minimum average flows derived from the recorded discharge dat...

Identification of trend or persistence in the rainfall series is essential to present the hydrological information in the condensed form for decision-making in water resources planning of any region. This paper exemplifies a study involving non-parametric statistical method of Mann-Kendall test for identification of existence of trends in annual ho...

Statistical analysis of historical rainfall, involving fitting of an appropriate distribution for obtaining rainfall intensities of different interval, is very much useful for making resource allocation decisions concerning risks. This paper gives details of a study involving the use of six statistical distributions for rainfall estimation for Barh...

Extreme value analysis of recorded rainfall is often a requirement for arriving at the basic structural and other design parameters for large civil engineering projects. The design parameters obtainable using extreme value analysis includes design storms and floods. This paper gives details of a study involving the use of seven different methods fo...

Irrigation planning and scheduling are essential components of water management in irrigated agriculture. For this purpose, optimal allocation of land and water is required for optimization of cropping pattern under a set of limitations. In this paper, an attempt was made to optimize the cropping pattern for Barna irrigation project using Linear an...

The Indian subcontinent with a long coastline distributed among nine coastal states and the islands group of Andaman- Nicobar and Lakshdeep Islands, requires prediction of tides at desired location, based on data from one place to another place, for planning and design needs, especially at interior of bays or at the vicinity of civil structures. Th...