Semi-solid manure has excess liquids drained off and some bedding added to increase solids content.
Solid manure has a relatively large amount of bedding added to give it a stackable consistency.
The emptying and hauling schedule from a solid or semisolid storage is more flexible. Storage length and capacity can vary from a few days to several months. With a semisolid or solid manure storage, manure can be hauled when ever time allows without planning ahead to agitate the storage as is required with liquid storages. Also, less total storage capacity is needed for a given storage length because less water is added. Plan for at least 3 months storage to allow flexibility for hauling manure when conditions are appropriate.