ENgetnodevalue: Retrieve node parameter value.

In epanet2toolkit: Call 'EPANET' Functions to Simulate Pipe Networks

Retrieve node parameter value.

Description

ENgetnodevalue retrieves the values of specific node parameters.

Usage

ENgetnodevalue(nodeindex, paramcode)

Arguments

nodeindex	An integer vector specifying the node index.
paramcode	An integer or character string, the parameter codes (see below).

Value

parameter value

Note

Node indexes are consecutive integers starting from 1.

Node parameter codes consist of the following constants:

EN_ELEVATION	0	Elevation
EN_BASEDEMAND	1	Base demand
EN_PATTERN	2	Demand pattern index
EN_EMITTER	3	Emitter coeff.
EN_INITQUAL	4	Initial quality
EN_SOURCEQUAL	5	Source quality
EN_SOURCEPAT	6	Source pattern index
EN_SOURCETYPE	7	Source type (see note below)
EN_TANKLEVEL	8	Initial water level in tank
EN_DEMAND	9	Actual demand
EN_HEAD	10	Hydraulic head
EN_PRESSURE	11	Pressure
EN_QUALITY	12	Actual quality
EN_SOURCEMASS	13	Mass flow rate per minute of a chemical source

Parameters 9 - 13 (EN_DEMAND through EN_SOURCEMASS) are computed values. The others are input design parameters.

Source types are identified with the following constants:

EN_CONCEN	0
EN_MASS	1
EN_SETPOINT	2
EN_FLOWPACED	3

See [SOURCES] for a description of these source types.

Values are returned in units which depend on the units used for flow rate in the EPANET input file (see Units of Measurement).

Examples

# path to Net1.inp example file included with this package
inp <- file.path( find.package("epanet2toolkit"), "extdata","Net1.inp")  
ENopen( inp, "Net1.rpt")
ENgetnodevalue(1, "EN_ELEVATION")
ENgetnodevalue(5, "EN_BASEDEMAND")
ENclose()

epanet2toolkit documentation built on May 29, 2024, 8:40 a.m.