Model of peak discharge (qp) & return period (t) of river Subernarekha, India

An empirical model between Peak Discharge (QP) and corresponding Return Period (T), obtained from Plotting position formulae, has been developed at Kharkai Barrage Site, India. Mathematical model has been developed by using Least Square Principle, Computer Programing and Software Packages. The model thus developed has been found to be highly satisfactory as the values of percentage deviation and standard deviation of percentage deviation are too low i.e. 0.94 and 0.57 respectively. High positive correlation has been identified between parameters involved in the study with value of Correlation Co-efficient lying always above 0.74. For any desired Return Period (T), the corresponding Peak Discharge (QP) can be computed readily from the developed model. The corresponding Stage (G) can also be ascertained from the rating curve (Mukherjee, M,K., Sarkar, S., 2007). The Stage (G) values will be extremely helpful to the exsisting flood warning system and for the construction of different hydraulic structures.