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And the incompatible nature of the two currents, designed to avoid command snafus, had apparently succeeded in keeping the upriver current alive a little longer.
But the ultimate source of upriver silicrobes was the downstream current, and the death of the smaller, still functioning portion of River Seven was inevitable.
From the feedstocks of Machine Lake were born all the silicrobes which comprised 50 percent by volume of the downstream River Seven channel. (The other half of the downstream channel was the traditional H2O from traditional sources: feeder streams, rainfall, underground aquifer connections. The missing volume of water had been long ago diverted for human consumption.) From Machine Lake the silicrobes exited, mingling with the available water in a synthetic gunmetal-colored broth. (Nanosmall, the silicrobes were of course invisible individually, presenting an homogenous appearance en masse.) Programmed to churn downstream at a steady speed, each maintaining a constant distance from the downstream shore and its neighbors, the silicrobes carried the water molecules along with them faster than mere gravity ever had.
At the mouth of River Seven, the fingerlike delt a a round Port Harcourt, the downstream silicrobes were trig-
gered by the increased salinity and by info from GloPos navsats, undergoing the transformation into upstream silicrobes. Separating from their partnered water molecules (which continued out to se a a s of yore), the upstream silicrobes made a coherent U-turn and headed back. Without H2O partners, they needed a virtual channel only half the size of the downstream one to make their way back to Machine Lake and resorption. Upstream speed was 80 percent of the downstream current.
Except today.
3. Big Muddy
The last chunky frondtree fell to Dos Santos's flashlight-machete with a sound like a watermelon hitting the floor from table-height, and sticky juice propelled by xylemic pressure sprayed his face and millipore suit. Then he stepped out of the jungle and onto the staymown vetiver turf of River Seven's upstream bank.
"Peej– suit bladders are now full with purified water, and any further dermal suit-contamination will have to be exosonically evaporated."
"Fine, fine," said Dos Santos absentmindedly, his entire concentration, basal and add-on, devoted to his ailing wide River.
The bipartite line of hyperfluid was dramatically sick.
Consider the more distant downstream side.
From its border with the upstream virtual channel all the way to the far bank, the downstream two-thirds of the River was
a stagnant dove-grey stripe.
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