Water Demand Summary

Reporting Units: Gallons Per Day Million Gallons Per Day Cubic Foot per Second Base Scenario     Year Municipal Domestic Well Industrial Agriculture Total Municipal Domestic Well Industrial Agriculture Total Difference Percent Change 2010 498,807,621 74,210,969 476,263,146 6,857,813,145 7,907,094,881 498,807,621 74,210,969 476,263,146 6,857,813,145 7,907,094,881 0 0% 2015 531,191,741 79,144,457 476,263,146 6,939,421,122 8,026,020,465 531,191,741 79,144,457 476,263,146 6,939,421,122 8,026,020,465 0 0% 2020 565,064,218 84,301,854 476,263,146 7,002,814,440 8,128,443,657 565,064,218 84,301,854 476,263,146 7,002,814,440 8,128,443,657 0 0% 2025 598,930,739 89,362,831 476,263,146 7,105,562,036 8,270,118,752 598,930,739 89,362,831 476,263,146 7,105,562,036 8,270,118,752 0 0% 2030 633,420,315 94,529,876 476,263,146 7,190,118,224 8,394,331,561 633,420,315 94,529,876 476,263,146 7,190,118,224 8,394,331,561 0 0% 2035 666,784,782 99,632,498 476,263,146 7,275,680,631 8,518,361,057 666,784,782 99,632,498 476,263,146 7,275,680,631 8,518,361,057 0 0% 2040 700,899,768 104,903,830 476,263,146 7,342,145,762 8,624,212,505 700,899,768 104,903,830 476,263,146 7,342,145,762 8,624,212,505 0 0% 2045 736,574,738 110,566,402 476,263,146 7,449,872,139 8,773,276,424 736,574,738 110,566,402 476,263,146 7,449,872,139 8,773,276,424 0 0% 2050 775,489,785 116,508,304 476,263,146 7,538,525,617 8,906,786,852 775,489,785 116,508,304 476,263,146 7,538,525,617 8,906,786,852 0 0% Total 75,548,646,155   75,548,646,155

Municipal Water Demand Model

Base Scenario     Year Growth (%) Population Served Average per capita Use (GPD) Demand (GPD) Growth (%) Population Served Average per capita use (GPD) Demand (GPD) Difference (GPD) Percent Change 2010 1.217 3,466,349 143.900 498,807,621   3,466,349   498,807,621 0 0% 2015 1.266 3,691,395 143.900 531,191,741   3,691,395   531,191,741 0 0% 2020 1.244 3,926,784 143.900 565,064,218   3,926,784   565,064,218 0 0% 2025 1.185 4,165,026 143.800 598,930,739   4,165,026   598,930,739 0 0% 2030 1.112 4,401,809 143.900 633,420,315   4,401,809   633,420,315 0 0% 2035 1.046 4,636,890 143.800 666,784,782   4,636,890   666,784,782 0 0% 2040 1.017 4,877,521 143.700 700,899,768   4,877,521   700,899,768 0 0% 2045 1.026 5,132,925 143.500 736,574,738   5,132,925   736,574,738 0 0% 2050 1.035 5,404,110 143.500 775,489,785   5,404,110   775,489,785 0 0% Total       5,707,163,705       5,707,163,705

Domestic Well Water Demand Model

Base Scenario     Year Growth (%) Population Served Average per capita Use (GPD) Demand (GPD) Growth (%) Population Served Average per capita use (GPD) Demand (GPD) Difference (GPD) Percent Change 2010 1.187 461,511 160.800 74,210,969   461,511   74,210,969 0 0% 2015 1.283 491,886 160.900 79,144,457   491,886   79,144,457 0 0% 2020 1.258 523,614 161.000 84,301,854   523,614   84,301,854 0 0% 2025 1.198 555,739 160.800 89,362,831   555,739   89,362,831 0 0% 2030 1.118 587,507 160.900 94,529,876   587,507   94,529,876 0 0% 2035 1.057 619,220 160.900 99,632,498   619,220   99,632,498 0 0% 2040 1.049 652,387 160.800 104,903,830   652,387   104,903,830 0 0% 2045 1.057 687,602 160.800 110,566,402   687,602   110,566,402 0 0% 2050 1.065 725,005 160.700 116,508,304   725,005   116,508,304 0 0% Total       853,161,020       853,161,020

Industrial Demand Model

Base Scenario     Year Growth (%) Demand (GPD) Growth (%) Demand (GPD) Difference (GPD) Percent Change 2010 0 476,263,146   476,263,146 0 0% 2015 0 476,263,146   476,263,146 0 0% 2020 0 476,263,146   476,263,146 0 0% 2025 0 476,263,146   476,263,146 0 0% 2030 0 476,263,146   476,263,146 0 0% 2035 0 476,263,146   476,263,146 0 0% 2040 0 476,263,146   476,263,146 0 0% 2045 0 476,263,146   476,263,146 0 0% 2050 0 476,263,146   476,263,146 0 0% Total   4,286,368,314   4,286,368,314

NOTE: The following parameters will be applied to every 5 year period in the model (2010, 2015, 2020... 2050)

	Base					Scenario
Crop	Starting Acres	Growth as Percent of Previous Acres	Water Used (inches/year)	Irrigation Efficiency (%)	Conveyance Efficiency (%)	Starting Acres	Growth as Percent of Previous Acres	Water Used (inches/year)	Irrigation Efficiency (% )	Conveyance Efficiency (%)
Wheat	105,694.7	101.190	17.629	57.686	80.000
Small Grains	66,141.9	101.190	16.379	67.798	80.000
Alfalfa & Other Hay	784,324.5	101.190	27.240	70.331	80.000
Pasture	471,771.7	101.190	26.668	52.795	80.000
Corn	84,461.4	101.190	20.261	72.913	80.000
Grass Seed	37,929.6	101.190	27.195	71.690	80.000
Horticulture	80,827.7	101.190	29.218	75.787	80.000
Tree Fruit & Nuts	53,851.3	101.190	23.359	74.987	80.000
Miscellaneous Crops	84,885.4	101.190	17.656	75.000	80.000
Grapes	8,982	101.190	10.100	90.000	80.000
Berries	18,014.5	101.190	18.741	73.686	80.000
Root Crops	44,385.5	101.190	26.799	75.000	80.000
Vegetables	33,274.8	101.190	16.753	73.487	80.000
Legumes	5,363.9	101.190	21.380	74.645	80.000
Livestock	18,786.4	101.190	12.000	100.000	80.000

About the Web based Water Demand Forecast Model

HDR originally created the spreadsheet water demand forecast model as part of the OWSCI project. This spreadsheet allows modelers very refined control over creating new scenarios. For a more simplified option, the Water Resources Department has created a web based Demand Forecasting tool. This web tool reduces the complexity of the spreadsheet model down to a handful of parameters that modelers can adjust to quickly identify their impact on future water demands. The web model uses the same basic principles and base data as the spreadsheet model, but it doesn't allow the fine adjustment and control offered by the spreadsheet.

The Web Water Demand Forecast Model base numbers do not exactly match the Spreadsheet base numbers

Because of the simplified approach to the models, using weighted averages of county values to determine state wide and basin parameters, plus a variety of rounding issues, you will discover that the Web and Spreadsheet base number do not exactly match. The web version does approximate the Spreadsheet trends and provides a good initial analysis. If you require a more exact and detailed analysis, please use the spreadsheet.

Using the Web Water Demand Forecast Model

Using the Web based Forecasting tool is fairly straightforward:

1. Select the area you wish to analyze.
2. Click on the tabs for each water demand type and change the values you wish to modify for your scenario.
3. Click the "Compute" button at the top of the screen to have the model re-computed. If you continue to change numbers, be sure to click the Compute button recompute when you are done.