This document summarizes a student project using HEC-HMS software to model rainfall runoff. The project aims to study and simulate the rainfall runoff process, learn how to use the modeling software, prepare a draft model, and compute and model runoff. Key aspects of the model include subdividing the area into sub-basins representing different land uses like residential and cultivated areas, inputting precipitation data and metrological models, using the SCS curve number loss model to compute losses, and running a simulation to output results.

1. PROJECT REVIEW
TOPIC: RAINFALLRUNOFFMODELLING
USING HEC-HMS SOFTWARE
Group members:
Sukrit Malhotra (11BCL1071)
Pushp Aggarwal (11BCL1053)
Project Coordinator:
Dr. Bindhu V.M

3. Introduction
Hydrological Model is a simplified representation of natural system.
Model is necessary for efficient planning and management. It provides
information that can help us to
 Be proactive and control a situation at the time of floods
 Estimate the increase in the volume.
 Regulate floodplain activities
 Operate or evaluate existing hydraulic-structures
Objective
 Studying and simulating rainfall runoff process.
 Learning the basic concepts of modelling software
 Preparation of draft model
 Using different hydrologic elements available
 Computing and modelling run off

4. Work Procedure

5. HEC-HMS Model
Cultivated land
CN-71
Residential area,
impervious 20
CN-68
Good condition
grass cover
CN - 61

6. Model Layout
Basin
Sub-basin
Junction
Precipitation data
Metrological models
Control Specification
Compute simulation run
Results

7. Method to Compute losses
To compute the losses(i.e. infiltration, evaporation or other volume
losses) we have used “The SCS curve number (CN) loss model”
CN=??

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THANK YOU