11. Marshall decided to use the natural force of the river to excavate and enlarge the tailrace . 12. A cofferdam was constructed for excavation of the tailrace and spillway channel, and subsequently removed. 13. Water from the power station is discharged down a long tailrace tunnel to the lower reservoir. 14. Water released from the power station is returned to the Tana via a long tailrace tunnel. 15. The canal passes under the unique Tokaanu Tailrace Bridge, a combined road bridge and aqueduct. 16. Parallel to the powerhouse, a tailrace tunnel discharges the water to the river channel below. 17. A tailrace then takes water from the power station and returns it to the Ishasha River. 18. The tailrace of the power plant discharges directly to the reservoir of the Qingshan Dam downstream. 19. After power generation the water will be discharged into the lower reservoir via four tailrace tunnels. 20. The relatively small reservoir relies on steady releases from the Kindaruma Reservoir via a long tailrace tunnel.
