A new permanent exhibit at the Fleet Science Center explores what may be the San Diego region’s most important system — it’s water supply. From the Colorado River to dams to desalination, the exhibit focuses on innovation and conservation in the 21st century. It replaces an earlier exhibit that debuted a decade ago. The new water exhibit is supported by the San Diego County Water Authority and the City of San Diego and was funded by a grant from the Hans and Margaret Doe Charitable Trust.