Reference section below from the SilverLakes Modification Guidelines for details on fountains and sculptures:
Fountains, Sculptures...: Fountains are permitted providing they are an operable and maintained part of a residential landscape bed area improvement. Fountains cannot stand alone on any front elevation and must not be more than (4') four feet in height or more than (3') three feet in diameter. Fountains must have prior Modification Committee approval. Fountains are limited to (1) one in the front of the property and NO animal, people or religious styles will be permitted.
No exterior sculptures or statues are permitted unless they are part of a residential landscape bed area and must have prior Modification Committee approval. Sculptures and/or statues cannot stand alone on any front elevation. Exterior sculptures and/or are limited to (3) three and must be no more than (18") eighteen inches in height.
Ponds or Wall Fountains, and/or water falls are not permitted in he front yard. They are allowed in the backyard of the property with prior approval from the Modification Committee.