2005 Section 321 Report – Summary Released 1/18/2007

The Defense Authorization Act of 2004, Section 321, directs the Secretary of the Interior, in consultation with the Secretary of Agriculture and the Secretary of Defense, and in cooperation with the Upper San Pedro Partnership (USPP), to prepare an annual report to Congress.  The report is referred to as the “Section 321 Report”.  The Section 321 report is drafted by the USPP, and outlines the steps being taken to reduce the overdraft and restore sustainable yield of groundwater in the Sierra Vista Sub-watershed by 2011.

The following is a summary of water availability and water use from the most recent Section 321 report (2005, based on 2004 data)

Natural Sources (Supply)

 

Natural Recharge

15,000 af

 

 

 

Ground Water Inflow

3,000 af

 

 

Total

18,000 af

Active Mgt Measures to Augment Natural (Supply)

Reduce Riparian Evapotran

475 af

 

City Effluent Recharge

1,870 af

 

Fort Effluent Recharge

440 af

 

Detention Basins Recharge

320 af

  (25 fm Fort; 290 fm City)

Total

3,105 af

Passive Recharge fm Human Activities (Supply)

Incidental Recharge
(septic tanks and turf watering)

2,410 af

Urban Enhanced Recharge
(stormwater in washes)

3,100 af

 

Total

5,510 af

 

TOTAL SUPPLY

26,615 af

 

 

 

Pumping (Use)

 

 

Fort Huachuca

1,488 af

 

City of Sierra Vista

5,497 af

  (does not include PDS golf course)

Other water companies and public supplies

3,385 af

 

Rural/Exempt Wells

4,700 af

 

Industrial

1,120 af

  (includes turf, sand, gravel and golf courses)

Irrigation

2,500 af

 

Total

18,690 af

River System Losses (loss)

Ground water outflow

440 af

 

Stream base flow

3,250 af

 

Evap and plant transpiration

7,700 af

 

 

Total

 

11,390 af

 

 

 

 

 

TOTAL USE & LOSS

30,080 af

 

 

 

 

 

 

 

Bottom Line: Supply – Use and Loss = Surplus or Deficit

18,000 af natural + 3,105 af active mgt + 5,510 af passive = 26,615 af

26,615 af – (18,690 af pumping – 11,390 af river system) = (-3,465 af)

3,465 af Deficit

*Figure rounded to 3,500 af ‘05 Sec 321 report

 

For More Information:

View the Section 321 Report in full

To see how much water is there and how much we use check out our Water Use and Recharge Animation .