Functions for pump characteristics
| Name | Description | 
|---|---|
|  | Base class for pump flow characteristics | 
|  | Base class for pump power consumption characteristics | 
|  | Base class for efficiency characteristics | 
|  | Linear flow characteristic | 
|  | Quadratic flow characteristic, including linear extrapolation | 
|  | Polynomial flow characteristic, including linear extrapolation | 
|  | Constant efficiency characteristic | 
|  | Linear power consumption characteristic | 
|  | Quadratic power consumption characteristic |