Support Irrigation

[akrherz]

As we expand west, we need to explicitly support Irrigation. So the current TODO list:

• database tracking of flowpaths that have irrigation. Simple boolean, one/off for the duration of modeling.
• support this for specification for WEPP runtime
• ensure this data does not come out the output end as precipitation
• will want explicit per flowpath per OFE irrigation per year specification

[akrherz]

For the WEPP implementation, we want option 2 "Depletion based sprinkler". This requires some parameters to be set, including.

• application rate of irrigation system (m/s) - real (irrate)
• ratio of application depth to amount of water needed to fill the soil profile to field capacity - real (aprati)
• maximum value for the ratio of available soil water depletion to available water holding capacity (depletion ratio at which irrigation will occur) - real (deplev)
• sprinkler nozzle impact energy factor - real (nozzle)
• Julian date of the beginning of the period during which irrigation might occur (julian day) - integer (irbeg)
• year of the beginning of the period during which irrigation might occur (year) - integer (yrbeg)
• Julian date of the end of the period during which irrigation might occur (julian day) - integer (irend)
• year of the end of the period during which irrigation might occur (year) integer (yrend)