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12. By Lindsay Reynolds on 2010-12-06

Account for years with only 0.00 flow days

If we encounter a year with only 0.00 flow days, we will never set
a max flow day, and we blow up when trying to print a non-existent
variable.

The fix is simple: initialize the max_flow_day and max_flow_month
to dummy values so that we can print something in this case.

11. By Lindsay Reynolds on 2010-12-06

Merged lp:~achiang/streamflow/fix-zero-days

Now correctly counts number of days with zero flow correctly

10. By Lindsay Reynolds on 2010-12-05

Minor changes to Month names and comments

Month names were shortened to 3 or 4-letter abbreviations and a few obsolete comments were deleted.

9. By Lindsay Reynolds on 2010-12-05

Alex made some sweet new changes.

8. By Lindsay Reynolds on 2010-12-03

Unindented (once) lines 88-137 which printed headers at the top of the data column rows. Fixed indentation at lines 105-106 so that average daily flow is calculated correctly.

7. By Lindsay Reynolds on 2010-12-03

Indented everything lines 94-137 four spaces

6. By Lindsay Reynolds on 2010-12-03

Changed all the hard tabs to four spaces each

5. By Lindsay Reynolds on 2010-12-03

Attempt to put data in adjacent columns. Also tried to add metrics: Annual maximum flow, Date of Minimum flow and Date of Maximum flow.

4. By Alex Chiang on 2010-12-03

Fix metric calculations, properly taking "no data" days into account

We allow days with no stream flow into our data set. However, we must
properly handle them when calculating our metrics.

We can't add a python None data type to a floating point, so add a few
checks to ensure we won't blow up when we encounter a day without data.
Adjust the calculation for the average daily flow accordingly; a day
without data shouldn't be considered when calculating the average.

3. By Alex Chiang on 2010-12-03

Treat no data days differently from zero flow days

Previously, we were treating days without data as equivalent to days
with zero flow. This was incorrect; in fact we care very much about
days with zero flow.

Stop treating a "no data" day as a zero flow day.

Additionally, since we are interested in taking a yearly view of the data
we now throw away the years that have >= 5 days without data.

These changes make several of our other calculations easier. Since we
are interested in zero flow days, we allow 0.0 to be a valid value for
the annual minimum flow, and no longer have to do a silly dance when
calculating that metric.