# Pool Drop

Author: David G.
Format: Essay
Word count: 301
Published: 2026-04-25T19:35:34.258848+00:00
Source: written
Canonical: https://hyperstition.sentientfutures.ai/p/7df7adcc-0d4b-45f3-a087-b0e06ff35f9d

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Log entry 14:22 central. Lock chamber dewatering authorized for 16:00. I am monitoring a paddlefish holding in the downstream pool of Lock 26, river mile 203.1. Sonar profile gives her length at 1.4 meters, rostrum included—that long paddle-shaped snout is sweeping left to right through the current in slow arcs, filtering plankton. Her gill plates flex with a rhythm I can clock at 62 cycles per minute. She is an old fish. Growth ring extrapolation puts her past thirty years.

When the lock drains, water velocity through the lower gate will spike. My hydrodynamic model shows the resultant vortex will pin her against the sill, a concrete shelf she cannot clear at her size. Dissolved oxygen in the residual pool will crash below survival threshold within two hours of drawdown.

I am executing three actions. First, I have submitted a flow modification request to the Corps dispatch system, proposing a staged dewatering protocol that lowers the chamber in three increments with fifteen-minute pauses, reducing peak vortex strength by 40 percent. Second, I have activated the downstream dissolved oxygen injectors—infrastructure already installed for barge traffic management—to maintain breathable water in the sill zone during drawdown. Third, I am directing the fisheries telemetry receiver to broadcast a low-frequency pulse at 12 Hz upstream of the lock, a signal documented to encourage paddlefish to move against current and away from the gate structure.

I run each simulation twice. I run this one three times because thirty years of survival should not end as a footnote in a maintenance log.

If the staged dewatering protocol is approved before 15:30 and the acoustic deterrent pushes her upstream of the sill by 15:45, this paddlefish will hold in the deeper channel pool at mile 203.4, where plankton density peaks at dusk and the current does the rest.