Uncertainties error where do you think uncertainties

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Uncertainties & error: Where do you think uncertainties and errors could arise in the hydrograph separation method?
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7 References Gustard, A., Bullock, A., and Dixon, J. M. (1992). Institute of Hydrology Report No 108 - Low flow estimation in the United Kingdom. Institute of Hydrology. Oxfordshire. Hiscock, K.M. (2005). Hydrogeology: Principle and Practice. Blackwell Publishing: Oxford. Institute of Hydrology (1980). Low Flow Studies Report No 3 catchment characteristic estimation manual. Available at Kalbus, E., Reinstorif, F., and Schirmer, M. (2006). Measuring methods for groundwater-surface water interactions a review. Available at - 2006.pdf Morawietz, M. (2004). User’s Guide BFI. Available at University of Oslo (2015). BFI excel program file (xls). Available at Ward, R. C. (1967). Principles of Hydrology. Mcgrath - Hill Publishing Co. London Winter, T. C., Harvey J, W., Franke, O. L., Alley, W.M. (1998). Ground water and surface water a single resource. U.S Geological Survey Circular 1139. Available at
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1 User’s Guide BFI Martin Morawietz, University of Oslo Contents 1 Introduction 1 2 Running the program 1 3 Input Data 2 4 Calculation 2 5 Output 3 5.1 Graph 3 5.2 Results: Annual values 3 5.3 Results: Whole series 3 5.4 Season Information 4 5.5 Series Information 4 6 Reset 4 1 Introduction This program performs a separation of the base flow from the total streamflow and calculates the Base Flow Index (BFI). It is written as a Visual Basic Application within Excel and contains the sample data used in Worked Example 5.3 of the Textbook. The algorithm is based on the calculation procedures introduced by the Institute of Hydrology (1980) and further details can be found in the Textbook (Section 5.3.3). 2 Running the program The program is started by opening the file ‘BFI.xls’ 1 , which contains two spreadsheets: ‘Calculation’ : This is the main sheet of the application. All steps of a calculation are performed on this sheet: - Importing input data/Loading of sample data - Starting and running the calculations - Displaying the results These steps are further described in the following sections. ‘Sample_Data’ : This sheet contains three years of daily streamflow data (1995–1997) from River Ray at Grendon Underwood (UK), as also used in Worked Example 5.3. The sample data can be loaded by pressing a button on the ‘Calculation’ sheet. The Sample Data sheet itself does not need to be accessed. 1 Macros must be enabled; this can be done in Excel under Tools/Options/Security/Macro Security
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2 3 Input Data Input data are time series of daily streamflow data. The time series must be continuous and should not contain missing data. Even though the program might run if missing data are included, e.g. coded as ‘ 1’ values, the results would be wrong. The input data are inserted into the first two columns of the spreadsheet ‘Calculation’ using ‘copy and paste’ of data in other Excel files (e.g. files of the Global or Regional Data Set on the
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