After her scheduled work ended, Jo Varela arrived at Bell Street Plaza carrying two cases and a folded raincoat. She set the cases on the table beside Sera’s map and opened neither until she had read every note.
“You lost a mark to runoff,” she said.
“Yes.”
“Did you repeat it from the same point?”
“From the rim after the flow settled, then from the other direction.”
Jo compared the times. “The junction reading could be a reflected signal. If you stand here, the channel wall may send the waterworks current back toward you.”
“I thought so too.”
“Then why did you mark a separate source?”
