The data dictionary for Flowline Value Added Attribute table in the National Hydrography Dataset.
NHDFlowlineVAA
NHDFlowline Value Added Attributes table. Table derived entirely from the NHDFlowline features and the NHDFlow table values.
| Name | Definition | Type | Allow Nulls | Length | Domain | Default Value | Comments |
|---|---|---|---|---|---|---|---|
| ArbolateSumKM | Sum of the lengths of all the drains that drain to the downstream end of the current drain. | Double | True | ||||
| DivergenceFlag | If this drain is 1 branch of a flow split, 1=drain is main branch, 2=otherwise, 0= drain not a branch of flow split. | Long Integer | True | ||||
| DnDrainCount | Number of drains immediately downstream. | Long Integer | True | ||||
| DnLevel | Stream level of drain. | Long Integer | True | ||||
| DnLevelPathID | Level path ID of downstream drain. | Double | True | ||||
| DnMinHydroSeq | At a divergence, the Hydro sequence number of the minor downstream drain. | Double | True | ||||
| FDate | Date of last feature modification. | Date | False | 8 | |||
| FromNode | Nationally unique ID for the "from" node endpoint of the drain. | Double | True | ||||
| HydroSeq | Nationally unique sequence number that places the reach in hydrologic sequence. | Double | True | ||||
| LevelPathID | Hydro Sequence No. of downstream drain that is on the same level path as this drain according to the DFlow Table. | Double | True | ||||
| OBJECTID | Internal feature or event number. | OBJECTID | False | ||||
| PathLengthKM | Distance from this drain pourpoint to its terminal drain's pourpoint according to the DFlow Table. | Double | True | ||||
| Permanent_Identifier | A 40-character globally unique ID (GUID) value that uniquely identifies the occurrence of each feature or event in The National Map. | Text | False | 40 | |||
| StartFlag | Set to '1' if the drain is a headwater drain according to the DFlow Table, otherwise '0'. | Long Integer | True | NoYesDomain | |||
| StreamLevel | Drain_level of the downstream mainstem drain. | Long Integer | True | ||||
| StreamOrder | Strahler stream order number for the drain. | Long Integer | True | ||||
| TerminalFlag | Set to '1' if drain is a terminal drain (flows into ocean, Great Lakes, Canada, Mex. or the ground) otherwise set to '0'. | Long Integer | True | NoYesDomain | |||
| TerminalPathID | Hydrologic sequence number of terminal flowline. | Double | True | ||||
| ThinnerCode | Ordinal value designed to allow selection of progressively more dense networks. Least dense network=1. | Long Integer | True | ||||
| ToNode | Nationally unique ID for the "to" node endpoint of the drain. | Double | True | ||||
| UpHydroSeq | Hydro Sequence No. of upstream mainstem drain. | Double | True | ||||
| UpLevelPathId | LevelPathID of upstream mainstem drain. | Double | True | ||||
| UpMinHydroSeq | Minimum Hydro Sequence No. of all upstream drains. | Double | True |