Grid Volume
grid_calculus
QgsProcessingParameterRasterLayer|GRID|Grid|None|False
QgsProcessingParameterEnum|METHOD|Method|[0] Count Only Above Base Level;[1] Count Only Below Base Level;[2] Subtract Volumes Below Base Level;[3] Add Volumes Below Base Level
QgsProcessingParameterNumber|LEVEL|Base Level|QgsProcessingParameterNumber.Double|0.0|False|None|None