# Routing Unit

The printing of routing unit output is controlled by entering "y" or "n" in the *ru* line in [print.prt](/io-docs/introduction-1/simulation-settings/print.prt.md). Routing unit output can be printed at daily, monthly, yearly, and average annual time steps. The names of the routing unit output files are as follows: 

* ru\_day.txt
* ru\_mon.txt
* ru\_yr.txt
* ru\_aa.txt

| **Field** | **Description**                                     | **Unit** |
| --------- | --------------------------------------------------- | -------- |
| jday      | Julian Day                                          | n/a      |
| mon       | Month                                               | n/a      |
| day       | Day of the month                                    | n/a      |
| yr        | Year                                                | n/a      |
| name      | Name of the object                                  | n/a      |
| type      | Type of the object                                  | n/a      |
| flo       | Routing unit flow                                   | m3/s     |
| sed       | Routing unit sediment                               | tons     |
| orgn      | Routing unit organic nitrogen                       | kg       |
| sedp      | Routing unit sediment phosphorus                    | kg       |
| no3       | Routing unit nitrate nitrogen                       | kg       |
| solp      | Routing unit soluble phosphorus                     | kg       |
| chla      | Routing unit Chlorophyll-a                          | kg       |
| nh3       | Routing unit ammonia nitrogen                       | kg       |
| no2       | Routing unit nitrite nitrogen                       | kg       |
| cbod      | Routing unit carbonaceous biochemical oxygen demand | kg       |
| dox       | Routing unit dissolved oxygen                       | kg       |
| san       | Routing unit sand                                   | tons     |
| sil       | Routing unit silt                                   | tons     |
| cla       | Routing unit clay                                   | tons     |
| sag       | Routing unit small aggregates                       | tons     |
| lag       | Routing unit large aggregates                       | tons     |
| grv       | Routing unit gravel                                 | tons     |
| null      |                                                     |          |


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