Agricultural and urban surface water and groundwater supplies and demands for the historic water budget period (WY 1991 to 2015) are represented in the Land Surface System (LSS). Total agricultural and urban water supplies, not including native area supplies, are estimated to be 1,103,100 AFY based on a combination of agricultural water supplies (1,012,700 AFY) and urban water supplies (90,400 AFY). Demands are estimated to be 1,090,900 AFY based on a combination of agricultural water demands (1,000,400 AFY) and urban water demands (90,500 AFY), not including native area demands. Average annual values for the historic water budget period LSS are subdivided further in the historic water budget graph and table below.
Historic Supplies = 1,185,200 AFY, Historic Demands = 1,172,300 AFY, with a Land Surface System Balance of 12,900 AFY:
| Component | Historic |
|---|---|
| Agricultural Areas Precipitation | 226000 |
| Agricultural Water Supply | 786500 |
| Agency Surface Water | 437800 |
| Agency Groundwater | 79200 |
| Private Groundwater | 269700 |
| Urban Areas Precipitation | 34900 |
| Urban Water Supply | 55500 |
| Groundwater | 55500 |
| Surface Water | 0 |
| Native Areas Precipitation | 74100 |
| Native & Riparian Uptake from Stream | 8000 |
| Total Supplies | 1185200 |
| Agricultural ET | 716500 |
| Agricultural ET of Precipitation | 140400 |
| Agricultural ET of Surface Water | 293400 |
| Agricultural ET of Agency Groundwater | 63900 |
| Agricultural ET of Private Groundwater | 218800 |
| Agricultural Percolation | 263700 |
| Agricultural Percolation of Precipitation | 62400 |
| Agricultural Percolation of Surface Water | 130900 |
| Agricultural Percolation of Agency GW | 22900 |
| Agricultural Percolation of Private GW | 47500 |
| Agricultural Runoff & Return Flow | 20200 |
| Urban Runoff & Return Flow | 56200 |
| Urban ET | 29200 |
| Urban Percolation | 5100 |
| Native Runoff | 5200 |
| Native ET | 64400 |
| Native Percolation | 11800 |
| Total Demands | 1172300 |
Total agricultural and urban water supplies for the LSS, not including native area supplies, are estimated to be 1,133,000 AFY based on a combination of agricultural water supplies (1,015,300 AFY) and urban water supplies (117,700 AFY). Demands are estimated to be 1,128,800 AFY based on a combination of agricultural water demands (1,011,300 AFY) and urban water demands (117,500 AFY), not including native area demands. Average annual values for the projected water budget period LSS are subdivided further in the projected water budget graph and table below.
Projected Supplies = 1,206,800 AFY, Historic Demands = 1,202,500 AFY, with a Land Surface System Balance of 4,300 AFY:
| Component | Projected |
|---|---|
| Agricultural Areas Precipitation | 237500 |
| Agricultural Water Supply | 777700 |
| Agency Surface Water | 439500 |
| Agency Groundwater | 51300 |
| Private Groundwater | 287000 |
| Urban Areas Precipitation | 41900 |
| Urban Water Supply | 75800 |
| Groundwater | 75800 |
| Surface Water | 0 |
| Native Areas Precipitation | 61200 |
| Native & Riparian Uptake from Stream | 12600 |
| Total Supplies | 1206800 |
| Agricultural ET | 745300 |
| Agricultural ET of Precipitation | 147600 |
| Agricultural ET of Surface Water | 320600 |
| Agricultural ET of Agency Groundwater | 38000 |
| Agricultural ET of Private Groundwater | 239100 |
| Agricultural Percolation | 234400 |
| Agricultural Percolation of Precipitation | 56900 |
| Agricultural Percolation of Surface Water | 118100 |
| Agricultural Percolation of Agency GW | 12200 |
| Agricultural Percolation of Private GW | 47200 |
| Agricultural Runoff & Return Flow | 31600 |
| Urban Runoff & Return Flow | 72300 |
| Urban ET | 33500 |
| Urban Percolation | 11700 |
| Native Runoff | 11900 |
| Native ET | 55300 |
| Native Percolation | 6500 |
| Total Demands | 1202500 |