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Modified SWAT model for Cedar Creek, IN

Authors: Adnan Rajib · Venkatesh Merwade
Owners: Adnan Rajib
Resource type:SWAT Model Instance Resource
Created:Jul 26, 2016 at 2:36 a.m.
Last updated: Jul 26, 2016 at 2:44 a.m. by Adnan Rajib


The objective of this study is to incorporate a time-dependent Soil Moisture Accounting (SMA) based Curve Number method (SMA_CN) in Soil and Water Assessment Tool (SWAT) and compare its performance with the existing CN method in SWAT by simulating the hydrology of two agricultural watersheds in Indiana, USA. Results show that fusion of the SMA_CN method causes decrease in runoff volume and increase in profile soil moisture content, associated with larger groundwater contribution to the streamflow. In addition, the higher amount of moisture in the soil profile slightly elevates the actual evapotranspiration. The SMA-based SWAT configuration consistently produces improved goodness-of-fit scores and less uncertain outputs with respect to streamflow during both calibration and validation. The SMA_CN method exhibits a better match with the observed data for all flow regimes, thereby addressing issues related to peak and low flow predictions by SWAT in many past studies. Comparison of the calibrated model outputs with field-scale soil moisture observations reveals that the SMA overhauling enables SWAT to represent soil moisture condition more accurately, with better response to the incident rainfall dynamics. While the results from the modification of the CN method in SWAT are promising, more studies including watersheds with various physical and climatic settings are needed to validate the proposed approach.

Subject Keywords

Soil Moisture Accounting,SWAT,Cedar Creek,Curve Number,Runoff

How to cite

Rajib, A., V. Merwade (2016). Modified SWAT model for Cedar Creek, IN, HydroShare, http://www.hydroshare.org/resource/d141d0076f2148dc999411970b95b72e

This resource is shared under the Creative Commons Attribution CC BY.


Sharing status:

  • Public Resource  Public
  • Sharable Resource  Shareable


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The people or organizations that created the intellectual content of the resource.

Name Organization Address Phone Author Identifiers
Adnan Rajib Purdue University
Venkatesh Merwade Purdue University
Model Output
Includes output files? Yes

Executed By
Name Unspecified

Model Objective
SWAT model objectives Hydrology

Extended Metadata
Name Value
Publication DOI: 10.1002/hyp.10639


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