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Why do some graphs have only green or green and yellow bands and no orange or red bands?

April 26, 2017bands graphs Orange red Yellow

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Why do some graphs have only green or green and yellow bands and no orange or red bands?

1 Answer

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There are two main reasons for this situation to occur. First, the range in water levels or streamflow may be relatively small. The 5th percentile value could be so close to the 10th percentile value that the graph appears to not have a red band. Secondly, we may not yet have sufficient historical record for that station to reliably provide that statistical information.