A new User Method Category, Unregulated Spill Type, has been added to Reservoir objects to model the effects of breakaway “flashboards” on unregulated spillways. The Unregulated Spill Type User Method Category is only available when a Method containing an unregulated spillway is selected in the spillCalculationCategory. There are three User Methods available for selection within this Category: the default Bare Crest Only, Flashboards, and Flashboards and Superboards.

The default Method performs no computations and existing models need not be modified. The Flashboards Method calculates Unregulated Spill based on a flashboard availability table, a flashboard spill table (for the flashboards which are up), and the unregulated spill table (for the flashboards which are down). The Flashboards and Superboards Method calculates Unregulated Spill based on the availability of flashboards and superboards (mounted on top of the flashboards), a superboard spill table (for the superboards which are up), a flashboard spill table (for the flashboards which are up), and the unregulated spill table (for the flashboards which are down). Both Methods adjust the availability of flashboards and superboards at each timestep based on user-input flashboard and superboard failure elevations. Due to drastic changes in spill volume when boards fail, the failure time of boards is calculated and modeled at a finer time resolution than the model run timestep. Detailed documentation of the two Methods may be found in the Simulation Objects Online Documentation.

A new User Method Category, Uncertainty Calculation, has been added to Storage Reservoir and Level Power Reservoir objects. There are two User Methods available for selection within this Category: the default No Uncertainty, and FOSM Uncertainty.

The default Method performs no computations and existing models need not be modified. The FOSM Uncertainty Method is first-order second-moment approximation for modeling system uncertainties. The uncertainty computations are executed at the end of the dispatch routines for all dispatch methods which do not have Energy or Spill as input slots. The slots for which uncertainties may be specified are Inflow, Outflow, Storage, Pool Elevation, Hydrologic Inflow, Evaporation, and Bank Storage. Detailed documentation of this Method may be found in the Simulation Objects Online Documentation.

Gainloss calculations which were specific to individual routing Methods in earlier versions of RiverWare are now available to all routing Methods. A new User Method Category called GainLoss Calculation, has been added to Reach objects. There are four User Methods available for selection within this Category: the default No GainLoss, Constant GainLoss, Variable GainLoss, and Seasonal GainLoss Flow Table. The default method performs no computations. Detailed documentation of the three other Methods may be found in the Simulation Objects On-line Documentation.

Models saved under earlier versions of RiverWare will have slot names automatically converted to their new names, but will NOT have the appropriate GainLoss method selected. If any Reaches previously calculated gains or losses (there were non-zero values in any of the old gain/loss slots), the appropriate Method must be selected in the GainLoss Calculation Category.

If a model was previously using the Constant GainLoss slot to compute reach loss, the data within this slot will be automatically converted to the new slot (GainLoss) but the user must select Constant GainLoss within the GainLoss Calculation category for the new slot to be active.

If a model was previously calculating gains or losses in a routing Method which used only the Variable GainLoss Coefficients and Variable GainLoss Coefficient Interpolated slots (Muskingum Cunge, Kinematic Routing, or MacCormack Routing), the Seasonal GainLoss Flow Table method must be selected. The data within the slots will be automatically transferred to Variable GainLoss Coeff Table and Variable GainLoss Coeff, however the Variable GainLoss Table will also be added. This table must contain values for the simulation to run. The table can be filled with zeros for the simulation to run identical to the previous model.

If the user was using either the Variable Muskingum or Muskingum Cunge routing methods, and Previous Flow Average was selected in the Apply Fractional Loss User Method Category, the following changes must be made: The proper Method must be selected in the GainLoss Calculation Category since the Fractional Loss Category no longer exists and Previous Flow Average must be selected in the Apply GainLoss Category. This Method works exactly the same as the previous method, however, it will not be selected by default because the name of the Method Category has changed.

The ssarr User Method in the routingMethodCategory User Method Category of Reach objects has been renamed Storage Routing. There is no functional difference between the two User Methods. Models saved under earlier versions of RiverWare will have the Method name changed automatically and will solve the same way as they did before.

A new User Method, Variable Storage Routing, has been added to the routingMethodCategory of Reach objects. This routing Method is identical to the Storage Routing Method except that its storage time exponent and storage time coefficient vary over time rather than being constant values. The exponent and coefficient are determined at each timestep from a table lookup given the flow at that timestep. Detailed documentation of this Method may be found in the Simulation Objects Online Documentation.

A new User Method, contingentLocalInflow, has been added to the localInflowCalculationCategory of Reach objects. The contingentLocalInflow User Method Category is only available when noRouting is selected as the routingMethodCategory. This local inflow Method changes the way in which the Reach solves depending on the known slots. If Local Inflow is known, it is used with the other known slot (Inflow or Outflow) to solve for the unknown (Outflow or Inflow). If Local Inflow is not known and only one of Inflow or Outflow is known, Local Inflow is set to 0.0 and the unknown slot is solved for. If Local Inflow is not known but both Inflow and Outflow are, Local Inflow is solved for. Detailed documentation of this Method may be found in the Simulation Objects Online Documentation.

A new User Method Category, Seepage Calc, has been added to Reach objects to model losses into groundwater. The Seepage Calc User Method Category is only available when noRouting is selected as the routingMethodCategory. This alleviates any confusion as to whether the seepage loss is applied before or after routing. There are three User Methods available for selection within this Category: the default No Seepage, Proportional Seepage, and Variable Seepage.

The default Method performs no computations. The Proportional Seepage Method calculates Seepage using a single Seepage Flow Fraction. The Variable Seepage Method calculates Seepage using a timeseries of Variable Seepage Flow Fractions. Seepage losses are applied at the top of a Reach, prior to any diversion, return flow, and/or gainloss.The calculated Seepage slot may be linked to a GroundWater Storage object. Detailed documentation of the two Methods may be found in the Simulation Objects Online Documentation.

The timeLagRouting Method has been enhanced to allow solving for Inflow based solely on Outflows. In prior releases of RiverWare, at least one Inflow was required for this Method to solve upstream. It will now dispatch and solve with Outflow only.

A new User Method, No Routing, has been added to the Request Routing Category of Aggregate Distribution Canal objects. The new Method allows a Distribution Canal network to be modeled in a non-request routing mode. In this mode, the Inflow into the top portion of the Canal system must be set in a different way (user input, linked from a Diversion Object, or return flow from another Canal or a Water User). The advantage to this Method, is the ability to operate a Canal system from the top down, rather than the bottom up (supply-driven rather than demand-driven). The new No Routing Method is the default Method for the Request Routing Category and performs no computations. Detailed documentation of this Method may be found in the Simulation Objects Online Documentation.

Three new User Methods have been added to the Flow Routing Category of Distribution Canal element objects. These User Methods are only available when No Routing is selected as the Request Routing Method in the Aggregate Distribution Canal object. In this case, the canal system is being operated in a top-down manner. This allows additional flexibility in routing algorithms because they only need to solve downstream. The three new Flow Routing Methods are the default No Routing, Storage Time, and Variable Storage Time.

The default Method performs no routing computations. The Storage Time Method is similar to the Storage Routing Method of Reach objects. The Variable Storage Time Method is similar to the Variable Storage Routing Method of Reach objects. Detailed documentation of these Methods may be found in the Simulation Objects Online Documentation.

A new User Method Category, Canal Seepage, has been added to Distribution Canal element objects to model losses into groundwater. There are three User Methods available for selection within this Category: the default None, Seepage Calc, and Variable Seepage Calc.

The default Method performs no computations. The Seepage Calc Method calculates Canal Seepage using a single Seepage Flow Fraction and a Maximum Seepage. The Variable Seepage Calc Method calculates Canal Seepage using a timeseries of Variable Seepage Flow Fractions and a Maximum Seepage. In both cases, the seepage is subtracted from the canal’s flow before any routing is done. The calculated Canal Seepage slot may be linked to a GroundWater Storage object. Detailed documentation of these Methods may be found in the Simulation Objects Online Documentation.

A new User Method Category, Canal Maximum Capacity, has been added to Distribution Canal element objects to model surface overflow at canal structures. There are two User Methods available for selection within this Category: the default None, and Maximum Capacity.

The default Method performs no computations. The Maximum Capacity Method calculates Canal Spillover as any portion of the canal element Inflow which is greater than the Maximum Capacity. The calculated Canal Spillover slot may be linked to a lateral Distribution Canal’s Inflow, or a Reach or Reservoir’s local Inflow. Detailed documentation of the two Methods may be found in the Simulation Objects Online Documentation.

The Stream Gage object no longer dispatches. Instead, flow values propagate across a link between the Inflow and Outflow slots. The link is automatically created when the Stream Gage is pulled off of the palette. Older models which contain Stream Gage objects will automatically be updated to include the link when the model is loaded.

A new User Method Category, called Excess GW Storage, has been added to Groundwater Storage objects to model groundwater saturation. The Method determines what to do with groundwater which is beyond the limits of the maximum groundwater capacity. There are three User Methods available for selection within this Category: the default No Excess Storage, Excess Storage to Outflow, and Excess Storage Divert.

The default Method performs no computations. The Excess Storage to Outflow Method adds any end-of-timestep storage greater than the Max GW Capacity to the Outflow slot. This simulates a situation where a full aquifer “spills” in the normal downgradient direction. The Excess Storage Divert Method allocates any end-of-timestep storage greater than the Max GW Capacity to the linkable Excess GW Outflow slot. This simulates a situation where a full aquifer “spills” by recharging another object such as a river or reservoir. Excess storage is determined only after the mass balance with Inflow, Deep Percolation, and Outflow has been calculated. Detailed documentation of the two Methods may be found in the Simulation Objects Online Documentation.

A new User Method Category, called GW Deep Percolation, has been added to Groundwater Storage objects to model the vertical movement of groundwater into deeper aquifers. The Method calculates a vertical seepage using similar algorithms to the horizontal outflow calculation. There are four User Methods available for selection within this Category: the default No Percolation, Input Percolation, Linear Percolation, and Exponential Percolation. The default Method performs no computations and existing model files need not be modified.

In low Storage situations, deep percolation is the preferred mechanism of Storage loss. If there is not enough Storage to satisfy Pumping Calc pumping requests, GWOutflowCalc outflow requirements, and GW Deep Percolation percolation requirements, the calculated values of the Methods are shorted in the order just listed. Detailed documentation of the three Methods may be found in the Simulation Objects Online Documentation.

A new User Method Category, called Pumping Calc, has been added to Groundwater Storage objects to allow pumping of groundwater by Water User objects. The Method calculates a maximum Available for Pumping value and lets the Water User object determine the amount of Pumped Flow. There are two User Methods available for selection within this Category: the default No Pumping, and Input Pumping. The default Method performs no computations and existing model files need not be modified.

The Input Pumping Method calculates Available for Pumping at the next timestep based on the end of timestep Storage and the projected Outflow and Percolation at the next timestep, such that Storage is never allowed to become negative. The Available for Pumping propagates across a link to a Water User object which determines the amount to pump and propagates this value back to the Pumped Flow slot. Detailed documentation of this Method may be found in the Simulation Objects Online Documentation.

The GW Alpha Param slot, which is used by the LinearFlow and ExponentialFlow Methods of the GWOutflowCalc Category has been changed. The units for this slot are now in “per time” [1/t]. This is the correct unit type for this slot, given the algorithm it is used in. Old models which contain this slot should be modified. The only way to change the slot units is to delete the object from the model, then pull a new object from the object Palette. Models which are not modified will continue to solve in the same way they did before, but the potential for confusion in the use of this slot will continue to be great.

The Water User object, which was previously available only as a member of an Aggregate Diversion Site, is now available as a “stand-alone.” The new object is created by dragging its icon off of the object Palette onto the workspace. The new Water User object contains all of the User Method Categories and User Methods which are available for Water User elements of Aggregate Diversion Sites linked with the noStructure Link Structure. Individual Water Users linked to a Diversion Object provide similar modeling capabilities to an Aggregate Diversion Site with considerably more flexibility.

A new User Method Category called Conjunctive Use, has been added to Water User objects. There are two User Methods available for selection within this Category: the default No Conjunctive Use and Supplement Diversion. The default method performs no computations. Models saved under earlier versions of RiverWare do not require any modifications and will solve the same way as they did before.

The new Supplement Diversion Method pumps water from a Groundwater Storage object to supplement surface water deliveries in time of shortage. The allocation of pumped water is contingent on pumping availability and may be allocated to Water Users in an Aggregate Diversion Site in accordance with their groundwater rights priorities. This Method Category is also available to Aggregate Diversion Sites using the lumpedStructure Link Structure. Complete documentation for this Method and Category are available in the Simulation Objects Online Documentation.

A new User Method, Available Flow Diversion, has been added to the Available Flow Calculation Category of Diversion Objects. This Method allows a Diversion Object to divert water from a Reservoir or Reach based on the water available for diversion from that object, rather than the objects elevation or stage. This flow-based diversion (as opposed to a head-based diversion) nearly replicates the behavior of the Aggregate Diversion Site. The diverted amount is calculated as the lesser of the Diversion Request, Available For Diversion, and Max Diversion. A Min Diversion, the smallest diversion possible, is also specified. Detailed documentation of this Method may be found in the Simulation Objects Online Documentation.