Conveyance

Conveyance File Components

The conveyance file is subsequent to the Water-Use Site file. It tracks water movement from source to facility and visa versa.

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Important Links:

• Conveyence template
• NWIS User Manual

Mandatory Information*	Non-Mandatory Data	Conditional Mandatory Data**

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Conveyance Variables

From Agency Code*	From Site Number*	To Agency Code*	To Site Number*	Delete Record Indicator (Modify)	Conveyance Type Code	Capacity Value**	Capacity Reporting Unit Name**

Mandatory

From Agency Code*	From Site Number*	To Agency Code*	To Site Number*

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Conveyance Attribute Dictionary

Variable	Definition	Data Entry Rule
From Agency Code*	The agency code associated with the from-site.	Site number and agency code must exist in the NWIS site file before entering a water-use site record.
From Site Number*	FROM-Site number. The site identification number associated with the source point of a conveyance. A source site can be a place where water is withdrawn from the hydrologic system, such as a well, or it can be a place of use (starting point of a transfer).	Site numbers and agency codes must exist in the NWIS site and water-use site files before entering a conveyance. Valid standalone from-sites are sources of water including wells (GW, GW-CR, GW-IW, GW-MW), spring (SP), aggregate ground-water (AG), aggregate surface-water (AS), or diversion (FA-DV). Whether one constructs conveyances with standalone from-sites or complete conveyances with from-site and to-site, the conveyance record must be created before entering water quantities. Once a conveyance record is created, the conveyance view can not be used to assign a different from-site or to-site; the user would have to delete and re-enter the conveyance record. If a conveyance is deleted then all associated water quantity records for all years are also deleted. See delete record indicator.
To Agency Code*	The agency code associated with the to-site.	Site number and agency code must exist in the NWIS site file before entering a water-use site record.
To Site Number*	TO-Site number. The site identification number associated with the destination point of a conveyance. A destination site can be a place where water is discharged back to the hydrologic system, such as an outfall, or it can be a place of use. It is possible to use standalone to-sites to construct a point-oriented, return based, network. Or to-sites can be connected to from-sites to track the flow of water.	Site numbers and agency codes must exist in the NWIS site and water-use site files before entering a conveyance. Valid standalone to-sites are destinations of water including outfall (FA-OF), injection wells (FA-WIW), land application (FA-WWD), spetic system (FA-SPS), aggregate ground-water (AG), and aggregate surface-water (AS). Wells (GW, GW-CR, GW-IW, GW-MW) can be entered as a to-site when combined with other site types to show water that is being returned for aquifer recharge. Whether one constructs conveyances with standalone to-sites or complete conveyances with from-site and to-site, the conveyance record must be created before entering water quantities. Once a conveyance record is created, the conveyance view can not be used to assign a different from-site or to-site; the user would have to delete and re-enter the conveyance record. If a conveyance is deleted then all associated water quantity records for all years are also deleted. See delete record indicator.
Delete Record Indicator (Modify)	The delete record indicator is used to identify that the conveyance should be deleted from the database. Enter a value of '$'.	The from-site agency code, from-site identifier, to-site agency code, and to-site identifier are required to identify the conveyance to be deleted. The delete record indicator is only valid for modify operations. The system will check for a delete record indicator value of '$' or '*'. If one deletes a conveyance record then the associated water quantity data for all years will be deleted from the database.
Conveyance Type Code	Conveyance type code. A conveyance is a logical connection between two sites. Enter the conveyance type code that physically describes the type of conveyance structure, for example PI, for a pipe.	The conveyance type code is mandatory, but the system will default it to unspecified 'UN', if not entered. It is suggested that wells be assigned the conveyance code of pipe (PI). The system validates the conveyance type code against the NWIS reference list CN_CD.
Capacity Value**	Conveyance capacity value. The conveyance capacity is the maximum flow capacity of the conveyance structure.	If a conveyance capacity value is entered, then the conveyance capacity report unit must be entered and vice versa. The system will calculate and store the number of significant figures that were in the original value entered. The system then converts and store the conveyance capacity value as a real number (double floating point value). On output the system uses the number of significant figures to correctly round the conveyance capacity value. A $ can be entered in a modify transaction to remove both the conveyance capacity value and the conveyance capacity unit.
Capacity Reporting Unit Name**	Capacity reporting unit name. The report unit associated with a conveyance capacity value.	The system verifies the capacity reporting unit against the NWIS reference list table WU_UNIT. Enter the report unit abbreviation (water unit abbreviation text, wu_unit_abbrv_tx). For example, enter Mgal/d for million gallons per day. The system checks for the existance of a conveyance capacity value. If a conveyance capacity value (cn_cap_va) is entered, then the conveyance capacity report unit must be entered and vice versa. A $ can be entered in a modify transaction to remove both the conveyance capacity value and the conveyance capacity unit.