From The Collaborative International Dictionary of English v.0.48:
Streamy \Stream"y\, a. 1. Abounding with streams, or with running water; streamful. [1913 Webster]
Arcadia However streamy now, adust and dry, Denied the goddess water. --Prior. [1913 Webster]
2. Resembling a stream; issuing in a stream. [1913 Webster]
His nodding helm emits a streamy ray. --Pope. [1913 Webster]