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Abstract
The volume and rate of storm water runoff in an urban watershed depend directly on the precipitation magnitude as well as its spatial and temporal distribution over the catchment. The runoff simulation may be on the basis of continuous or event wise rainfall data. Event wise simulation requires a minimum of one design-storm hyetograph as input. In contrast, continuous runoff modelling incorporates the entire meteorological record (days, months or years) of the watershed as the input. Many a time, due to the non-availability of short-interval rainfall data, a continuous simulation is performed. The present study predicts the runoff in an urban north-east Indian catchment based on event wise and continuous simulation. Continuous modelling has been performed by taking the daily rainfall data as input file. Storm water management model has been used for runoff simulation. This would help to understand the variations in urban runoff modelling due to an event based and continuous rainfall input. Green Ampt model has been used for infiltration modelling. A comparison is presented between the predicted runoff from the continuous and event wise rainfall data by considering different imperviousness parameters. The simulated runoff is overestimated by the total impervious area (TIA) that disregards the type of connectivity to the collecting network.
Acknowledgement
The authors would like to thankfully acknowledge Department of Science and Technology (DST), India for the financial support extended for performing this research work vide the project no. SR/FTP/ETA-0005/2008. This article belongs to the papers presented at the Hydro-2012 conference held at I I T Bombay on December 7-8, 2012 that were short-listed by the Editor for publication in this Journal after re-review and revisions where necessary.