Leg 7 of the Trans-Rocky-Mountain aqueduct. From the Abiquiu Reservoir to the San Juan River.

Leg 7 of the Trans-Rocky-Mountain aqueduct. From the Abiquiu Reservoir to the San Juan River, a distance of 55 miles.

Elevation 6270′ Water storage 200,000 acre-ft, max. capacity 1,369,000 acre-ft.

After delivering some water to Rio Grande and other drop off points, the sixth leg has a capacity of 8500 cfs. It starts out at 6270′ and climbs to 7400′ over a distance of 25 miles. This requires a maximum power of (7400-6270 + 2x 25) = 1180′ times 8500 cfs. Assuming a pump efficiency of 92% this comes to a power of 900 MW. From the top it then descends to 5590′ over 30 miles. This will generate a power of (7400-5590 – 2x 30) = 1750′ times 8500 cfs. With generator efficiency of 92% this comes to 1,100 MW. This last leg will generate up to 200 MW power, thus reducing the total power need for the aqueduct.

Once joining the San Juan River there may be some levies put in to protect the people having built their homes in the flood plain. The river once was unregulated and subject to seasonal floods, and periods of very low flood, but once the San Juan Reservoir was built, the ecology of the river changed drastically. The addition of the aqueduct’s water would further stabilize the flow, but not add to the risk of seasonal floods.

The San Juan River would then add a maximum of 8,500 cfs. of water to the Colorado River, but especially during the summer months much water will be delivered en route to thirsty communities, such as Albuquerque and even Santa Fé, and some water will help the greening of the surroundings of the aqueduct and even save aquifers, especially the Ogallala aquifer, so the real average flow will be more like 5,000 cfs. This will translate to an additional yearly inflow of 3.6 million acre-feet into the Colorado River.