1) WHAT Using USGS Daily Flow Data

        i) I will enter USGS gaging station number

        ii) I do not know USGS gaging station number - Web GIS - 48 States

        iii) WHAT using Google Map Interface --> NEW !!!

        iv) Is USGS web server alive or down ?



    2) Enter/Upload Data to WHAT Server

        i) I will ENTER my flow data

        ii) I will UPLOAD my flow data

        iii) HOURLY version



    3) Compute R2 and Nash-Sutcliffe Coeff.

    4) What is 'WHAT' ?

              • The prototype version of the Web-based hydrograph separation system was developed,
                and is still available from http://pasture.ecn.purdue.edu/~kjlim/iSep. No change since Aug. 2002.

              • New hydrograph separation modules were added to the WHAT system.
                  - one parameter digital filter method (filter parameter) - same algorithm used in BFLOW filter - in SWAT Homepage
                  - two parameter digital filter method (filter parameter and BFImax)
              • WHAT system was extended to include GIS capabilities for WI, MN, OH, IL, MI, and SC - July 27, 2004.
                  - For other states, please use 2) I will enter USGS gaging station number


              • Flow statistics module was added to the WHAT system.

              • Click here to see the overview of the WHAT GIS system using two different digital filters used in the WHAT GIS system.

              • K.J. Lim, B.A. Engel, Z. Tang, J. Choi, K. Kim, S. Muthukrishnan, and D. Tripathy. 2005. Web GIS-based Hydrograph Analysis Tool, WHAT. JAWRA, 41(6): 1407-1416.


    5) Frequently Asked Questions

    6) Contact Us

              • Professor, Bernie Engel, ABE, Purdue University
                -- E-mail: engelb@purdue.edu for General Questions


              • Assistant Prof. Kangwon National University, Korea, Kyoung Jae Lim
                -- E-mail: kjlim@kangwon.ac.kr for Hygrograph Analysis, Digital Filter Codes, and Technical Questions
                -- Dr. Lim is now in S. Korea.

              • Ph.D, Zhenxu Tang, ABE, Purdue University
                -- E-mail: ztang@ecn.purdue.edu for Flow Statistics


              • GIS Specialist, Larry Theller, CAAGIS, ABE, Purdue University
                -- E-mail: theller@ecn.purdue.edu for GIS / Spatial Data


              • Assitant Professor, Suresh Muthukrishnan, Dept. of Earth and Environmental Sciences, Furman University
                -- E-mail: suresh.muthukrishnan@furman.edu for Validation







              • The WHAT concept, design, and model functions are copyrighted dated on March, 2004.





    What is WHAT ?



    :::: this page :: https://engineering.purdue.edu/~what/ ::::


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