# EPANET: [CURVES]

[CURVES]

Purpose:

Defines data curves and their X,Y points.

Format:

One line for each X,Y point on each curve containing:

- Curve ID label
- an X value
- a Y value

Remarks:

1. Curves can be used to represent the following relations:
   - Head v. Flow for pumps
   - Efficiency v. Flow for pumps
   - Volume v. Depth for tanks
   - Head Loss v. Flow for General Purpose Valves
2. The points of a curve must be entered in order of increasing X-values (lower to higher).
3. If the input file will be used with the Windows version of EPANET, then adding a comment which contains the curve type and description, separated by a colon, directly above the first entry for a curve will ensure that these items appear correctly in EPANET's Curve Editor. Curve types include PUMP, EFFICIENCY, VOLUME, and HEADLOSS. See the examples below.

Example:

[CURVES]
;ID Flow Head
;PUMP: Curve for Pump 1
C1 0 200
C1 1000 100
C1 3000 0
;ID Flow Effic.
;EFFICIENCY:
E1 200 50
E1 1000 85
E1 2000 75
E1 3000 65