When running HEC-1, WMS reads the TAPE22 hydrograph results file. However, it is convenient to read measured hydrographs for comparison with computed hydrographs, therefore a simplified hydrograph file format can be used. The format is shown in Figure 1, with a sample file given in Figure 2.
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HYDROGRAPH |
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name starttime interval numordinates |
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flow-1 flow-2 flow-3 ... flow-10 |
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... |
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... |
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... |
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flow-n |
Figure 1. Hydrograph File Format.
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HYDROGRAPH |
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B1 0 30 25 |
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0.0 0.4 0.9 1.5 2.2 3.0 3.9 4.9 6.0 7.2 |
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9.5 12.8 16.0 15.2 14.1 10.2 9.0 7.5 5.8 4.0 |
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3.3 2.2 1.0 0.5 0.1 |
Figure 2. Sample Hydrograph File.
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Card Type |
HYDROGRAPH |
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Description |
Defines a set of hydrographs. |
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Required |
YES |
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Format |
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Sample |
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Field |
Variable |
Value |
Description | |||||||
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1 |
name |
str |
Station (basin or outlet) name (KK in HEC-1). | |||||||
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2 |
starttime |
+ |
Military time (0-2400) at the start of the event. | |||||||
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3 |
interval |
+ |
Interval in minutes between hydrograph ordinates. | |||||||
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4 |
numordinates |
+ |
The number of hydrograph ordinates. | |||||||
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5-n |
flow |
+ |
Hydrograph ordinates.Each of fields 1-5+n are repeated for each station in the file. | |||||||
The hydrograph file is considered to be free-field when read by WMS so any number of spaces can be used to separated the different parameters. Figure 2 shows a sample file where there are 25 ordinates with a time interval of 30 minutes.