KATHMANDU, Nepal — It had been 11 days since a ruptured valve reduced Kupondole district’s pipeline flow to a dribble, and the phones at Pradeep Tamanz’s tanker business wouldn’t stop ringing. A Malaysian embassy residence had run perilously low on water, and the diplomats wanted to shower. They’d pay extra for a swift delivery. A coffee processing plant was on the verge of shutting down production after emptying its storage tank. It, too, would shell out whatever amount of money it would take. Across the neighborhood and other parts of the city, the calls were coming in so feverishly that Sanjay, a tanker driver, jokily wondered if he might get carjacked. “This is like liquid gold,” he said, jabbing at his precious cargo, large amounts of which seeped from every hatch. “Maybe more than gold.”