Laserfiche WebLink
<br />v. Description of Data and Software: South Platte Consumptive Use Model (SPCU) <br /> <br />Table 2: Water Budget Output from SpeD <br /> <br />Item Name Relationship Description <br />A River Supply For a given farm (modeling area), sum of river headgate prorata diversions <br /> for the various surface water sources. River headgate prorata diversion is <br /> total river headgate diversions for a given water source multiplied by "farm <br /> share allotment divided by total shares". <br />B Conveyance Loss [(l-Con Eff.) x The sum of one minus the Conveyance Efficiency multiplied by River Supply <br /> A] (A). <br />e Farm Surface Water [A - B] River Supply (A) minus Conveyance Loss (B). <br /> Supply <br />D Surface Water Supply [Appl Eff. x C] Application Efficiency multiplied by Farm Surface Water Supply (C). <br /> Available for CU <br />E Surface Water Deep [C - 0] Farm Surface Water Supply (C) minus Surface Water Supply Available for <br /> Percolation and Runoff CU (0). <br />F Farm Well Supply (Sum Sum of discharge measurements in acre-ft for all wells on the selected farm <br /> Well Discharge) (modeling area). <br />G Well Water Available for [App Eff x F] Application Efficiency for well water multiplied by Farm Well Supply (F). <br /> CU <br />H Well Water Loss due to [F -G] Farm Well Supply (F) minus Well Water Available for CU (G). <br /> Deep Percolation and <br /> Runoff <br />I Total Water Supplies [0 + G] If wells are used as part of the water supply, this term represents the Surface <br /> (Surface + Wells) Water Supply Available for CU (0) plus Well Water Available for CU (G). <br /> Available for CU Otherwise this term is equal to Surface Water Supply Available for CU (0). <br />J Total Rainfall Measured in acre-ft for total farm irrigated acres. <br />K Effective Rainfall to CU Effective rainfall is computed using the SCS or USBR method limited by CU. <br /> This value is computed by field and then summed for the farm (modeling <br /> area), depending on the selection of method made in the main window See <br /> "Monthly Precipitation Methods" on page 20.. <br />L Effective Rainfall to Both effective rainfall methods meet the consumptive use first and put the <br /> Soil Storage remaining effective rainfall (i.e. Effective Rainfall computed without CU limit- <br /> K) into the soil profile up to the limit of the storage capacity. The available <br /> soil Storage is set by Average Water Holding Capacity and the Maximum <br /> Allowed Depletion (MAD), and then multiplied by the Root Depth for each <br /> crop and the area of the field. This option is available, only if the With Soil <br /> Moisture Budget option is selected. <br />M Deep Percolation and [J - (K + L)] Total Rainfall (J) minus the sum of Effective Rainfall (K) plus the Effective <br /> Runoff of Rainfall Rainfall to Soil Storage (L). <br />N Irrigation Water [Gross CU - K] Total consumptive use minus Effective Rainfall to CU (K) computed by field <br /> Requirement (IWR) and then summed for the farm (modeling area). <br /> <br />24 <br /> <br />Completion Report: South Platte Mapping and Analysis Program <br />