Save Our River Estuaries (SORE)
The goal of SORE is to raise public awareness about environmental and politcal issues
relating to the recent proposal to extract water from the Albion and Gualala Rivers
by a multinational consortium, and to bring our concerns to the state and federal agencies
A summary of useful calculations concerning water & waterbags.
Alaska Water Exports' proposal for Gualala
40 - 170 cubic feet per second --> 20,000 acre-feet per year (AFY)
(Data from 1/18/02 Independent Coast Observer)
Using an average of 100 cubic feet per second:
At that rate, a bag holding 35,000 cubic meters would be filled in about 3.5 hours,
which means they could fill about 7 waterbags per day.
These are the waterbags used by Nordic Water Supply ASA,
one of the partners of Alaska Water Exports in the
World Water SA consortium.
||38,000 short tons
||35,000 metric tons
All figures are approximate, and refer to a full waterbag.
Alaska Water Exports proposes to extract 20,000 acre feet per year (AFY) from the Gualala River, during the rainy season.
Since each bag holds approximately 28 acre feet, they would need 20,000 / 28 = ~700 bags per year.
If the rainy season is roughly 100 days long, that means about 7 bags per day.
That agrees very closely with the flow rate calculation above: 100 ft3/sec --> 7 bags per day.
|average rainfall (feet per year)
|total AFY in watershed
|company proposing export
||Alaska Water Exports
||World Water SA
|AFY proposed for export
|percent of total water
AFY = acre feet per year
average rainfall figures are obviously a rough estimate
For comparison, The Sea Ranch Water Company is currently permitted to extract
a maximum of 300 AFY from the Gualala River watershed (subject to certain restrictions).
Please let me know if you have information on other allocated water rights in the Gualala or Albion watersheds.
I've got a copy of the NCWAP draft (North Coast Water Assessment Program's "Gualala Watershed Synthesis Report"),
but it doesn't have an AFY figure for the North Gualala Water Company.
Equivalencies: Weights & Measures for water
- 1 square mile = 640 acres
- 1 acre = 43,560 square feet
- 1 acre foot = 43,560 cubic feet
- 1 cubic foot = 7.5 gallons
- 1 gallon = 8.3 pounds
- 1 cubic foot = 62 pounds
- 1 acre foot = 326,700 gallons = 2,711,610 pounds = 1,355 short tons
- 1 centimeter3 = 1 gram = 1 milliliter
- 1 decimeter3 = 1 kilogram = 1 liter
- 1 meter3 = 1 metric ton = 1,000 liters
[Metric is so much easier!]
(please send suggestions & corrections to):
last updated: 2002-02-27