OWA-EPANET Toolkit  2.2
Network Building Example

This example shows how a network can be built just through toolkit function calls, eliminating the need to always use an EPANET formatted input file. This creates opportunities to use other sources of network data in one's code, such as relational database files or GIS/CAD files.

Below is a schematic of the network to be built.

#include "epanet2_2.h"
void netbuilder()
// Create a project that uses gpm for flow units and
// the Hazen-Williams formula for head loss
int index;
EN_init(ph, "", "", EN_GPM, EN_HW);
// Add the first junction node to the project with
// an elevation of 700 ft and a demand of 0
EN_addnode(ph, "J1", EN_JUNCTION, &index);
EN_setjuncdata(ph, index, 700, 0, "");
// Add the remaining two junctions with elevations of
// 710 ft and demands of 250 and 500 gpm, respectively
EN_addnode(ph, "J2", EN_JUNCTION, &index);
EN_setjuncdata(ph, index, 710, 250, "");
EN_addnode(ph, "J3", EN_JUNCTION, &index);
EN_setjuncdata(ph, index, 710, 500, "");
// Add the reservoir at an elevation of 650 ft
EN_addnode(ph, "R1", EN_RESERVOIR, &index);
EN_setnodevalue(ph, index, EN_ELEVATION, 650);
// Add the tank node at elevation of 850 ft, initial water level
// at 120 ft, minimum level at 100 ft, maximum level at 150 ft
// and a diameter of 50.5 ft
EN_addnode(ph, "T1", EN_TANK, &index);
EN_settankdata(ph, index, 850, 120, 100, 150, 50.5, 0, "");
// Add the pipes to the project, setting their length,
// diameter, and roughness values
EN_addlink(ph, "P1", EN_PIPE, "J1", "J2", &index);
EN_setpipedata(ph, index, 10560, 12, 100, 0);
EN_addlink(ph, "P2", EN_PIPE, "J1", "T1", &index);
EN_setpipedata(ph, index, 5280, 14, 100, 0);
EN_addlink(ph, "P3", EN_PIPE, "J1", "J3", &index);
EN_setpipedata(ph, index, 5280, 14, 100, 0);
EN_addlink(ph, "P4", EN_PIPE, "J2", "J3", &index);
EN_setpipedata(ph, index, 5280, 14, 100, 0);
// Add a pump to the project
EN_addlink(ph, "PUMP", EN_PUMP, "R1", "J1", &index);
// Create a single point head curve (index = 1) and
// assign it to the pump
EN_addcurve(ph, "C1");
EN_setcurvevalue(ph, 1, 1, 1500, 250);
// Save the project for future use
EN_saveinpfile(ph, "example2.inp");
// Delete the project
Definition: epanet2_enums.h:184
Definition: epanet2_enums.h:39
int EN_addcurve(EN_Project ph, char *id)
Adds a new data curve to a project.
int EN_setjuncdata(EN_Project ph, int index, double elev, double dmnd, char *dmndpat)
Sets a group of properties for a junction node.
int EN_saveinpfile(EN_Project ph, const char *filename)
Saves a project's data to an EPANET-formatted text file.
Reservoir node.
Definition: epanet2_enums.h:174
Pump head v. flow curve index.
Definition: epanet2_enums.h:94
int EN_addnode(EN_Project ph, char *id, int nodeType, int *index)
Adds a new node to a project.
int EN_setnodevalue(EN_Project ph, int index, int property, double value)
Sets a property value for a node.
Definition: epanet2_enums.h:185
Gallons per minute.
Definition: epanet2_enums.h:265
struct Project * EN_Project
The EPANET Project wrapper object.
Definition: epanet2_2.h:49
int EN_setcurvevalue(EN_Project ph, int curveIndex, int pointIndex, double x, double y)
Sets the value of a single data point for a curve.
int EN_createproject(EN_Project *ph)
Creates an EPANET project.
Storage tank node.
Definition: epanet2_enums.h:175
int EN_init(EN_Project ph, const char *rptFile, const char *outFile, int unitsType, int headLossType)
Initializes an EPANET project.
Definition: epanet2_enums.h:251
int EN_settankdata(EN_Project ph, int index, double elev, double initlvl, double minlvl, double maxlvl, double diam, double minvol, char *volcurve)
Sets a group of properties for a tank node.
int EN_deleteproject(EN_Project ph)
Deletes a currently opened EPANET project.
Junction node.
Definition: epanet2_enums.h:173