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Title: An efficient and simplified computer program to estimate the Infiltration Index
Authors: Natarajan, N
Vasudevan, M
Keywords: Computer code;Infiltration index;φ-index;Rainfall;Runoff
Issue Date: Jun-2020
Publisher: NISCAIR-CSIR, India
Abstract: Estimation of direct runoff during a storm largely depends on the infiltration characteristics in the catchment area which are highly heterogeneous in space and time. Conventionally, a constant value for infiltration rate was adopted during storm runoff estimation at regular intervals even for varying rainfall intensities. However, this approach resulted in large anomalies in predicted trend in storm hydrograph as well as infiltration patterns. The infiltration index (φ index) calculated based on such rainfall intensities is a trial and error process, and can be quite time consuming. Thus, it becomes obvious to consider the dynamic variation in infiltration rate for more accurate prediction of hydrologic events. In order to easily determine the φ index for different hydrological data, a computer program was developed in this study using MATLAB® platform. The adaptive numerical model was validated with four different benchmark problems (incremental and cumulative rainfall with long and short durations). It is observed that there is good agreement between the results obtained from the code and manually calculated results with significant time saving. Hence, it is imperative that not only hydrologists can make use of this approach for calculating the infiltration index for storms with longer duration, but also for implementing technology-enhanced learning in modern smart classrooms.
Page(s): 965-969
ISSN: 0975-1033 (Online); 0379-5136 (Print)
Appears in Collections:IJMS Vol.49(06) [June 2020]

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