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Manual Start Page

Table of Contents

  1. WATFLOOD USER’S MANUAL
  2. HYDROLOGICAL MODEL
  3. WATERSHED DATA REQUIREMENTS
  4. MODEL PARAMETERS AND OPTIMIZATION
  5. RAINFALL DATA PROCESSING
  6. FLOW DATA
  7. SNOW DATA PREPARATION
  8. TEMPERATURE DATA
  9. RADIATION DATA
  10. OUTPUT FILES
  11. PROGRAM REVISIONS
  12. BIBLIOGRAPHY

4.3.2   Error Criterion

The optimization criterion is to minimize the normalized RMS error of the flows. The total error is calculated by:

Sum for all n: RMS error of hourly flows
                                               Peak flow * 100                     (3.5)

where n is the number of streamflow stations used for comparison.

A provision is made to select the stations to include in the error calculation by a sequence of binary flags in the first line of data of the strfw\XXXXXX.str file.

Example:

111011111000000000000000000000000000000
    9  168  168    1----------93 01 03 00
 4801  554 GRND/GALT  
 4833  545 W. MONTROSE 
   .
   .
   .

In this example, there are 9 streamflow stations (40 are possible) and all but the 4th station are used in the error calculation. These flags can change from one event to the next.

Example:

These are the first lines in each of three .str files for three events that are chained:

000000000000000000000000000000000000000
111011111000000000000000000000000000000
111011111000000000000000000000000000000

In this example, the error for all stations used for comparison will not be included in the total error for the first event. The error for stations 1, 2, 3, 5, 6, 7, 8, and 9 will be used for the second and third events. Thus, flow station 4 is ignored (so could be used for validation).

 

Selecting Parametersarrowleft.jpg (828 bytes) arrowright.jpg (541 bytes)Hints for Optimization
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