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Navigation: Main Menu and Buttons > Model > MODFLOW Dialog Boxes > MODFLOW Packages and Programs Dialog Box > FMP: Farm Process (for MODFLOW OWHM Version 2) SURFACE_WATER: Farm Process V4 Surface Water Options |
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The SURFACE_WATER: Farm Process V4 Surface Water Options pane is used to activate the surface water options in the Farm Process in MODFLOW-OWHM version 2 and specify options for it. It is in the Farm Process group on the MODFLOW Packages and Programs dialog box.
The pane has three collapsible tabs on it. The tabs can be opened or closed by clicking on their headers.
The three tabs are
These options will cause the Farm Process to print detailed data of various sources. For a detailed description of the data printed see the the files in doc\Output_Header_Defintion of the MODFLOW-OWHM release. PRINT SFR_DELIVERY: The Farm Process will print budgets for water delivered from the SFR package for each delivery point. PRINT SFR_DELIVERY_BY_WBS: The Farm Process will print budgets for water delivered from the SFR package for each water balance subregion. PRINT SFR_RETURN: The Farm Process will print a runnoff budget for all SFR segment/reaches that receive FMP runoff. PRINT SFR_SRR_ONLY: The Farm Process will print a runnoff budget for all SFR return points. PRINT NRD: The Farm Process will print NON_ROUTED_DELIVERY water demanded and delivered for each nonrouted delivery point, for each water balance subregion. PRINT NRD_BY_WBS: The Farm Process will print NON_ROUTED_DELIVERY water demanded and delivered for each water balance subregion. |
Semi-routed delivery closure tolerance: SEMI_ROUTED_DELIVERY's are updated every solver iteration based on the available water in SFR. The keyword SEMI_ROUTED_DELIVERY_CLOSURE_TOLERANCE defines a tolerance for how much a delivery rate can change between solver iterations before convergence is allowed. If not specified, then the default tolerance is 0.02 L3/T change in delivery. This indicates that--in addition to the solver criteria--convergence is only allowed if the the change in SEMI_ROUTED_DELIVERY from the previous iteration is less then 0.02 L3/T Rebuild fully routed return: By default the FULLY ROUTED RETURN network is determined only when the FMP WBS IDs change spatial location. This saves computation time, since the fully routed network return locations should not change. If the SFR package is configured such that the SFR network is changing by stress period, then there is a chance that the fully routed network can be incorrect (for example a segment appears in a water balance subregion that was not originally there) The keyword REBUILD_FULLY_ROUTED_RETURN forces FMP to rebuild the FULLY ROUTED RETURN network at the start of every stress period. This slows the simulation runtime down and should only be enabled when SFR has segment/reaches moving (not inflow but its physical location) |
Non-routed delivery: NON_ROUTED_DELIVERY (NRD) is quantity of water that is available to a water balance subregion. If activated, nonrouted deliveries are specified in the Water Balance Subregions dialog box. If the static option is selected, the first nonrouted delivery item for each farm in the Water Balance Subregions dialog box will be used. Semi-routed deliveries: Delivery points are where a water balance subregion can divert water from a stream reach in the SFR package to meet irrigation demand. This implies that the SFR package must be active for semi-routed deliveries to be specified. If activated, semi-routed deliveries are specified in the Water Balance Subregions dialog box. If the static option is selected, the first semi-routed delivery item for each farm in the Water Balance Subregions dialog box will be used. SRD lower-limit: If SEMI_ROUTED_DELIVERY_LOWER_LIMIT is activated, the user specifies a lower limit of flow in the stream and the amount diverted must not cause flow in the stream to drop below that limit. The lower limit will be static or transient depending on the choice for semi-routed deliveries. The lower limits are specified in the Water Balance Subregions dialog box. SRD upper-limit: If SEMI_ROUTED_DELIVERY_UPPER_LIMIT is activated, the user specifies an upper limit on the amount of flow diverted from the stream. The upper limit will be static or transient depending on the choice for semi-routed deliveries. The upper limits are specified in the Water Balance Subregions dialog box. However, if both a lower and an upper limit are used, the maximum amount that can be diverted is the difference between the lower and upper limit rather than the upper limit itself. No return flow choice: If NO_RETURN_FLOW is activated, the user specifies for each farm how runoff is handled. The runoff may infiltrate as deep percolation. Otherwise, it is transferred to stream segments or leaves the model entirely. The choice is specified in the Water Balance Subregions dialog box. If NO_RETURN_FLOW is not used, the runoff is transferred to stream segments or leaves the model entirely. Semi-routed return: If SEMI_ROUTED_RETURN is activated, the user can designate locations along an SFR segment at which runoff from a water balance subregion will enter a stream. The locations are specified in the Water Balance Subregions dialog box. Routed return: If runoff does not infiltrate as deep percolation and is not routed to specific reaches, it can be treated as routed return. In this case, the runoff will be prorated by reach length over any reaches in the water balance subregion. However, it can consider either all reaches or only nondiversion reaches when prorating the runoff. |
