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Stormwater runoff has created plenty of strife in Fairfax County in recent years: While the EPA has tried to classify the water as a pollutant and limit its flow into a local stream, the county’s board of supervisors disagreed and a legal battle ensued. “Dissolving,” a new work by Christopher K. Morgan & Artists, uses the human form to explore similar issues when it premieres this weekend at McLean’s Alden Theatre. Locally collected rainwater acts as both set decoration and percussion while performers respond to the sounds water creates. Along with “Dissolving,” the company premieres “Selective Sync,” an exploration of relationships and interactions in the digital age that Morgan created with the American University dance program. Performers using their bodies to explain water conservation and online encounters might prompt further explanation, so Morgan and other collaborators will answer questions and discuss their creative process in a post-show discussion. The company performs at 8 p.m. Friday and Saturday at Alden Theatre, 1234 Ingleside Ave., McLean. $18–$27. (703) 790-0123. aldentheatre.org.