Figure C-4 Schematic diagram of the field scale example C-2 Calculation Examples of Productivity Indicators The purpose of the indicators are: Evaluate crop production (in weight or gross crop revenue) per acre-foot of applied water within a defined scale. Evaluate how production (in weight or gross crop revenue) per acre-feet changed over time within a defined scale. An example of the productivity indicators are calculated for a 73,000 acres county scale in Table C-5. Table C-5 Calculation of productivity as indicators of agricultural water use efficiency Data Element Calculation Result Weight of crop Example Option 1 use County Ag Option 1 = 44.5 tons/acre x 73,000 – production Commissioner reports and USDA NASS data, acres = 3.25 million tons area-weighted for overlying counties Option 2 = 46.2 tons/acre x 78,200 Example Option 2 survey of growers, acres = 3.61 million tons – processers Gross revenue of Example Option 1 Use Ag Commissioner Option 1 = $56.70 $/ton x 44.5 – crop production reports and USDA NASS data, area-weighted for tons/acre x 73,000 acres = $184.2 overlying counties million Option 2 = $58.20 $/ton x 46.2 Example Option 2 survey of growers, local tons/acre x 78,200 acres = $210.3 – processers million County Applied provided by DWR from the Plan Update Option 1 = 135,050 AF Water water balance studies Equations: PAW Calculate range for both methods of estimating Low: 3.25 MT/135,050 AF production = 24 tons/AF High: 3.61 MT/135,050 AF = 26.75 tons/AF VAW Calculate range for both methods of estimating Low: $184.2 million/135,050 AF gross revenue of production = $1,362/AF High: $210.3/135,050 AF = $1,557/AF Table C-6 presents the gross crop revenue or gross value per acre-foot of applied water (VAW) for each of the significant crops or crop groups in Fresno and Colusa counties in California expressed in terms of 2010 dollars per acre-foot of applied water.
Figure C-4 Schematic diagram of the field scale example C-2 Calculation Examples of Productivity Indicators The purpose of the indicators are: Evaluate crop production (in weight or gross crop revenue) per acre-foot of applied water within a defined scale. Evaluate how production (in weight or gross crop revenue) per acre-feet changed over time within a defined scale. An example of the productivity indicators are calculated for a 73,000 acres county scale in Table C-5. Table C-5 Calculation of productivity as indicators of agricultural water use efficiency Data Element Calculation Result Weight of crop production Example Option 1 – use County Ag Commissioner reports and USDA NASS data, area-weighted for overlying counties Example Option 2 – survey of growers, processers Option 1 = 44.5 tons/acre x 73,000 acres = 3.25 million tons Option 2 = 46.2 tons/acre x 78,200 acres = 3.61 million tons Gross revenue of crop production Example Option 1 – Use Ag Commissioner reports and USDA NASS data, area-weighted for overlying counties Example Option 2 – survey of growers, local processers Option 1 = $56.70 $/ton x 44.5 tons/acre x 73,000 acres = $184.2 million Option 2 = $58.20 $/ton x 46.2 tons/acre x 78,200 acres = $210.3 million County Applied Water provided by DWR from the Plan Update water balance studies Option 1 = 135,050 AF Equations: PAW Calculate range for both methods of estimating production Low: 3.25 MT/135,050 AF = 24 tons/AF High: 3.61 MT/135,050 AF = 26.75 tons/AF VAW Calculate range for both methods of estimating gross revenue of production Low: $184.2 million/135,050 AF = $1,362/AF High: $210.3/135,050 AF = $1,557/AF Table C-6 presents the gross crop revenue or gross value per acre-foot of applied water (VAW) for each of the significant crops or crop groups in Fresno and Colusa counties in California expressed in terms of 2010 dollars per acre-foot of applied water.
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