Water Quality and Sediment Parameters
The Water Quality Simulation Parameters govern how the engine performs the additional water quality calculations during a simulation.
It is not normally necessary to amend the Water Quality Simulation Parameters. The default values have been chosen for optimum accuracy and performance. However, these parameters can be edited if required.
To view and edit water quality simulation parameters, select Model parameters  Water quality and sediment parameters from the Model menu. The water quality simulation parameters for the current network are displayed in the Object Properties Window.
Parameters
Database Table Name: hw_wq_params
Show Columns  Database Names 
Size, Type and Units  
Defaults and Error Limits 
Field Name  Help Text  Database Field  Data Type  Size  Units  Precision  Default  Error Lower Limit  Error Upper Limit  Warning Lower Limit  Warning Upper Limit  
Space step multiplier  This is the maximum multiplier of the hydraulic computational mesh size used for the water quality calculations. Its purpose is to reduce the memory requirements for water quality calculations  space_step_multiplier  Long Integer  0  3  1  
Number of initial state steps  This parameter is used to control the length of the water quality initialisation period for the system.
If the water quality simulation is started using the final state of another simulation as the initial state of the new simulation, then this initialisation process does not occur. See Water Quality Simulations. 
initial_state_steps  Long Integer  0  1  1  
Initialisation timestep (s)  If Number of Initial State Steps is zero, the simulation uses this field as the timestep during initialisation.  initialisation_timestep  Double  2  1920  15  
Initialisation tolerance  If Number of Initial State Steps is zero, the simulation uses this field as the tolerance during initialisation.  initialisation_tolerance  Double  8  1e6  0.0000001 
Show Columns  Database Names 
Size, Type and Units  
Defaults and Error Limits 
Field Name  Help Text  Database Field  Data Type  Size  Units  Precision  Default  Error Lower Limit  Error Upper Limit  Warning Lower Limit  Warning Upper Limit 
Switching iterations – trajectory solver  The iteration number at which to perform a single underrelaxation step to assist convergence.  trajectory_switching_iterations  Long Integer  0  20  1  
Max iterations – trajectory solver  The maximum number of iterations allowed when generating the velocity used in the midpoint rule  trajectory_max_iterations  Long Integer  0  30  1  
Absolute tolerance – trajectory solver  The iterative calculation of the midpoint is considered to have converged if the change in position of the midpoint of the trajectory from one iteration to the next is less than the Absolute Tolerance in metres.  trajectory_absolute_tolerance  Double  8  0.005  0.00000001  
Relative tolerance – trajectory solver  The iterative calculation of the midpoint is considered to have converged if the change in position of the midpoint of the trajectory from one iteration to the next is less than Relative Tolerance * Trajectory Length in metres.  trajectory_relative_tolerance  Double  8  0.005  0.00000001  
Max iterations – node solver  The maximum number of iterations in the network node solver to generate a FluxCorrected Transport (FCT) solution  node_solver_max_iterations  Long Integer  0  10  1  
Relative tolerance – node solver  The iterative calculation of a FluxCorrected Transport (FCT) solution is considered to have converged when the change in concentration between two successive iterations is less than Relative Tolerance * Latest Concentration for all nodes.  node_solver_relative_tolerance  Double  8  0.001  0.00000001  
Time weighting factor – node solver  The Time Weighting Factor (q) represents the degree of implicitness in node solver discretisation:
q > 0.5 gives unconditional stability q = 0.5 gives second order accuracy q = 1 is recommended for the control of unphysical oscillations 
node_solver_time_weighting  Double  3  1.0  0  1 
Show Columns  Database Names 
Size, Type and Units  
Defaults and Error Limits 
Field Name  Help Text  Database Field  Data Type  Size  Units  Precision  Default  Error Lower Limit  Error Upper Limit  Warning Lower Limit  Warning Upper Limit 
Max iterations – bed depth  Not implemented in this version of InfoWorks ICM  bed_depth_max_iterations  Long Integer  0  20  1  
Relative tolerance – bed depth  Not implemented in this version of InfoWorks ICM  bed_depth_relative_tolerance  Double  8  0.05  0.00000001  
Deposition limit  The maximum amount of sediment allowed to build up in a conduit, as a proportion of flow depth. Default value is 0.1 (10%). See Sediment. Note that this only applies when erosion / deposition does not affect hydraulics.
Deposition Limit depends on the status of the Erosion / Deposition Affects Hydraulics checkbox on the QM Parameters Dialog (accessed via the Schedule Hydraulic Run View). If the Erosion / Deposition Affects Hydraulic box is not checked, the Deposition Limit specified in the Water Quality Parameters will be used. If the box is checked, a Deposition Limit of 80% of the conduit height is used. 
deposition_limit  Double  3  0.1  0  1  
Bed d50  The d50 particle size for the sediment bed.  bed_d50  Double  PS  3  1  0.001  
Bed specific gravity  The specific gravity of the sediment bed.  bed_s  Double  3  2.6  1 
Show Columns  Database Names 
Size, Type and Units  
Defaults and Error Limits 
Field Name  Help Text  Database Field  Data Type  Size  Units  Precision  Default  Error Lower Limit  Error Upper Limit  Warning Lower Limit  Warning Upper Limit 
Max iterations – ColebrookWhite  The maximum number of iterations allowed in the NewtonRaphson nonlinear solver for the friction factor in the ColebrookWhite equation.
Valid values are: Maximum Iterations > 0 
cw_max_iterations  Long Integer  0  20  1  
Relative tolerance – ColebrookWhite  The NewtonRaphson iteration for the friction factor in the ColebrookWhite equation is considered to have converged when the change in the value between two successive iterations is less than Previous Value * Relative Tolerance
Valid values are: Relative Tolerance > 0 
cw_relative_tolerance  Double  8  0.01  0.00000001 
Show Columns  Database Names 
Size, Type and Units  
Defaults and Error Limits 
Field Name  Help Text  Database Field  Data Type  Size  Units  Precision  Default  Error Lower Limit  Error Upper Limit  Warning Lower Limit  Warning Upper Limit  
Erosion/deposition model  Choose the 1D erosion/deposition model used by the simulation engine.
See Conduit Model for further details.

erosion_model  Text  12  0  AckersWhite  
Active layer depth method (1D)  Method of determining active layer depth:

aldepth_method_1D  Text  12  D50 
Show Columns  Database Names 
Size, Type and Units  
Defaults and Error Limits 
Field Name  Help Text  Database Field  Data Type  Size  Units  Precision  Default  Error Lower Limit  Error Upper Limit  Warning Lower Limit  Warning Upper Limit  
Calibration coefficient  Calibration coefficient to adjust the 2D sediment carrying capacity of the flow  calibration  Double  3  1  0  
Active layer depth method  Method of determining active layer depth:

aldepth_method  Text  12  0  Constant  
Active layer depth  Active layer thickness.
Applicable when Active layer depth method is set to Constant. 
aldepth  Double  Y  3  
Active layer depth factor  Multiplying factor for calculating active layer thickness.
Applicable when Active layer depth method is set to D50 or D90. 
aldepth_factor  Double  3  
Model type  Model type of the 2D Erosiondeposition model:

model_type  Text  14  0  
Total load model  Total load model used in the 2D Erosiondeposition model.
See 2D Sediment Transport Equations for details.

total_load_model  Text  20  0  Ackers_White revised  
Equilibrium nearbed concentration  Formulation to estimate the equilibrium near bed concentration used for suspended load only calculations in the 2D Erosiondeposition model.
See 2D Sediment Transport Equations for details.

nbconc_method  Text  20  0  Van Rijn  
Nearbed concentration  Formulation to estimate the nearbed concentration used for suspended load only calculations in the 2D Erosiondeposition model.
See 2D Sediment Transport Equations for details.

nbconc  Text  20  0  Rouse profile  
Skin friction method  Skin friction calculation method.
See 2D Sediment Transport Equations for details.

skinfric_method  Text  20  0  Manning  
Limit erosion rate  Check this option to impose an upper limit on the rate of erosion of suspended load.  limit_erosion_rate  Boolean  0  0  
Max erosion rate  Enabled if Limit erosion rate is checked.
Rate of erosion of suspended sediment will be limited to the value specified. The limitation will be applied to each sediment fraction in the case of independent fractions, or to the composite erosion rate for dependent fractions. 
max_erosion_rate  Double  ERODERATE  3  0.0  
Limit deposition rate  Check this option to impose an upper limit on rate of deposition of suspended load.  limit_deposition_rate  Boolean  0  0  
Max deposition rate  Enabled if Limit deposition rate is checked.
Rate of deposition of suspended sediment will be limited to the value specified. The limitation will be applied to each sediment fraction in the case of independent fractions, or to the composite erosion rate for dependent fractions. 
max_deposition_rate  Double  ERODERATE  3  0.0 
Show Columns  Database Names 
Size, Type and Units  
Defaults and Error Limits 
Field Name  Help Text  Database Field  Data Type  Size  Units  Precision  Default  Error Lower Limit  Error Upper Limit  Warning Lower Limit  Warning Upper Limit  
Calibration coefficient  Calibration coefficient to adjust the 2D bed load carrying capacity of the flow.  bedload_calibration  Double  3  1  0  
Bed load formula  Bed load formula used in the 2D Bed Load model.
See 2D Sediment Transport Equations for details.

bedload_formula  Text  20  0  MeyerPeterMüller  
Critical Shields method  Method to calculate the critical Shields parameter.
Not applicable if Bed load formula is set to EinsteinBrown. See 2D Sediment Transport Equations for details.

critical_shields_method  Text  15  0  User defined  
Critical Shields parameter  Applicable if Critical Shields method is set to User defined.  critical_shields  Double  Y  3  0.047  0  
Coefficient K  Applicable if Bed load formula is set to User defined.  k_coefficient  Double  3  12, which corresponds to Nielsen method  0  
Coefficient A  Applicable if Bed load formula is set to User defined.  a_coefficient  Double  3  0, which corresponds to Nielsen method.  0  
Coefficient B  Applicable if Bed load formula is set to User defined.  b_coefficient  Double  3  1, which corresponds to Nielsen method.  0  
Exponent 1  Applicable if Bed load formula is set to User defined.  exp1_coefficient  Double  3  0.5, which corresponds to Nielsen method.  0  
Exponent 2  Applicable if Bed load formula is set to User defined.  exp2_coefficient  Double  3  0.5, which corresponds to Nielsen method.  0  
Exponent 3  Applicable if Bed load formula is set to User defined.  exp3_coefficient  Double  3  1, which corresponds to Nielsen method.  0  
Exponent 4  Applicable if Bed load formula is set to User defined.  exp4_coefficient  Double  3  1, which corresponds to Nielsen method.  0  
Exponent 5  Applicable if Bed load formula is set to User defined.  exp5_coefficient  Double  3  1, which corresponds to Nielsen method.  0  
Exponent 6  Applicable if Bed load formula is set to User defined.  exp6_coefficient  Double  3  1, which corresponds to Nielsen method.  0 
Sediment fraction 1 and Sediment fraction 2
Show Columns  Database Names 
Size, Type and Units  
Defaults and Error Limits 
Field Name  Help Text  Database Field  Data Type  Size  Units  Precision  Default  Error Lower Limit  Error Upper Limit  Warning Lower Limit  Warning Upper Limit  
d16 of sf1  Applicable if Model type is set to Suspended load and Equilibrium nearbed concentration is set to Van Rijn.
The d16 particle size of Sediment Fraction 1. 
d16_sf1  Double  PS  3  0  
d35 of sf1  Applicable if Model type is set to Total load and Total load model is set to AckersWhite or AckersWhite revised.
The d35 particle size of Sediment Fraction 1. 
d35_sf1  Double  PS  3  0  
d50 of sf1  The d50 particle size of Sediment Fraction 1
Applicable to all erosion/deposition models 
d50_sf1  Double  PS  3  0.001  
d84 of sf1  Applicable if Model type is set to Suspended load and Equilibrium nearbed concentration is set to Van Rijn.
The d84 particle size of Sediment Fraction 1. 
d84_sf1  Double  PS  3  0  
d90 of sf1  Applicable if:
The d90 particle size of Sediment Fraction 1. 
d90_sf1  Double  PS  3  0  
Specific gravity of sf1  The Specific Gravity of Sediment Fraction 1
Applicable to all erosion/deposition models 
s_sf1  Double  3  1  
1D settling velocity of sf1  The settling velocity of Sediment Fraction 1
Applicable to all erosion/deposition models 
settling_velocity_sf1  Double  3  0  
Critical erosion efficiency for sf1  Velikanov model only  eta1_sf1  Double  8  0.00225  0  
Critical deposition efficiency for sf1  Velikanov model only  eta2_sf1  Double  8  0.00275  0  
Alpha deposition for sf1  Alpha deposition parameter for Sediment Fraction 1
Applicable to KUL model only 
alpha_deposition_sf1  Double  5  0  
Beta deposition for sf1  Beta deposition parameter for Sediment Fraction 1
Applicable to KUL model only 
beta_deposition_sf1  Double  3  1  
Gamma deposition for sf1  Gamma deposition parameter for Sediment Fraction 1
Applicable to KUL model only 
gamma_deposition_sf1  Double  3  0  
Alpha erosion for sf1  Alpha erosion parameter for Sediment Fraction 1
Applicable to KUL model only 
alpha_erosion_sf1  Double  5  0  
Beta erosion for sf1  Beta erosion parameter for Sediment Fraction 1
Applicable to KUL model only 
beta_erosion_sf1  Double  3  1  
Gamma erosion for sf1  Gamma erosion parameter for Sediment Fraction 1
Applicable to KUL model only 
gamma_erosion_sf1  Double  3  0  
Density of sf1  Density of Sediment Fraction 1  dens_sf1  Double  DENSITY  3  1700  
2D sf1 settling velocity calculation  Method used to estimate settling velocity of Sediment Fraction 1.
See 2D Sediment Transport Equations for details.

settling_calc_sf1  Text  12  0  User  
2D sf1 settling velocity  Applicable when 2D sf1 settling velocity calculation set to User.
Settling velocity of Sediment Fraction 1. 
2D_settling_velocity_sf1  Double  SETVEL  3  
Corey shape factor of sf1  Corey shape factor of Sediment Fraction 1.
Measures the sphericity of sediment grains. 
corey_shape_factor_sf1  Double  3  0.7  0.3  0.9  
Porosity of sf1  Porosity of Sediment Fraction 1  porosity_sf1  Double  3  0.375  0  1  
Skin roughness parameter of sf1  Skin roughness parameter of Sediment Fraction 1.
Relates the Nikuradse equivalent grain roughness with the sediment diameter. 
roughness_sf1  Double  3  2.5  0  
Angle of repose of sf1  Maximum angle that sediment can accumulate at and remain stable.  repose_sf1  Double  ANGLE  2  90  0  90  
d16 of sf2  Applicable if Model type is set to Suspended load and Equilibrium nearbed concentration is set to Van Rijn.
The d16 particle size of Sediment Fraction 2. 
d16_sf2  Double  PS  3  0  
d35 of sf2  Applicable if Model type is set to Total load and Total load model is set to AckersWhite or AckersWhite revised.
The d35 particle size of Sediment Fraction 2. 
d35_sf2  Double  PS  3  0  
d50 of sf2  The d50 particle size of Sediment Fraction 2
Applicable to all erosion/deposition models 
d50_sf2  Double  PS  3  0.001  
d84 of sf2  Applicable if Model type is set to Suspended load and Equilibrium nearbed concentration is set to Van Rijn.
The d84 particle size of Sediment Fraction 2. 
d84_sf2  Double  PS  3  0  
d90 of sf2  Applicable if:
The d90 particle size of Sediment Fraction 2. 
d90_sf2  Double  PS  3  0  
Specific gravity of sf2  The Specific Gravity of Sediment Fraction 2
Applicable to all erosion/deposition models 
s_sf2  Double  3  1  
1D settling velocity of sf2  The settling velocity of Sediment Fraction 2
Applicable to all erosion/deposition models 
settling_velocity_sf2  Double  3  0  
Critical erosion efficiency for sf2  Velikanov model only  eta1_sf2  Double  8  0.00225  0  
Critical deposition efficiency for sf2  Velikanov model only  eta2_sf2  Double  8  0.00275  0  
Alpha deposition for sf2  Alpha deposition parameter for Sediment Fraction 2
Applicable to KUL model only 
alpha_deposition_sf2  Double  5  0  
Beta deposition for sf2  Beta deposition parameter for Sediment Fraction 2
Applicable to KUL model only 
beta_deposition_sf2  Double  3  1  
Gamma deposition for sf2  Gamma deposition parameter for Sediment Fraction 2
Applicable to KUL model only 
gamma_deposition_sf2  Double  3  0  
Alpha erosion for sf2  Alpha erosion parameter for Sediment Fraction 2
Applicable to KUL model only 
alpha_erosion_sf2  Double  5  0  
Beta erosion for sf2  Beta erosion parameter for Sediment Fraction 2
Applicable to KUL model only 
beta_erosion_sf2  Double  3  1  
Gamma erosion for sf2  Gamma erosion parameter for Sediment Fraction 2
Applicable to KUL model only 
gamma_erosion_sf2  Double  3  0  
Density for sf2  Density of Sediment Fraction 2  dens_sf2  Double  DENSITY  3  1700  
2D sf2 settling velocity calculation  Method used to estimate settling velocity of Sediment Fraction 2.
See 2D Sediment Transport Equations for details.

settling_calc_sf2  Text  12  0  User  
2D settling velocity of sf2  Applicable when 2D sf2 settling velocity calculation set to User.
Settling velocity of Sediment Fraction 2. 
2D_settling_velocity_sf2  Double  SETVEL  3  
Corey shape factor of sf2  Corey shape factor of Sediment Fraction 2.
Measures the sphericity of sediment grains. 
corey_shape_factor_sf2  Double  3  0.7  0.3  0.9  
Porosity of sf2  Porosity of Sediment Fraction 2  porosity_sf2  Double  3  0.375  0  1  
Skin roughness parameter of sf2  Skin roughness parameter of Sediment Fraction 2.
Relates the Nikuradse equivalent grain roughness with the sediment diameter. 
roughness_sf2  Double  3  2.5  0  
Critical erosion efficiency composite  Velikanov model only  eta1_composite  Double  8  0.00225  0  
Critical deposition efficiency composite  Velikanov model only  eta2_composite  Double  8  0.00275  0  
Alpha deposition composite  KUL model only  alpha_deposition_composite  Double  5  0  
Beta deposition composite  KUL model only  beta_deposition_composite  Double  3  1  
Gamma deposition composite  KUL model only  gamma_deposition_composite  Double  3  0  
Alpha erosion composite  KUL model only  alpha_erosion_composite  Double  5  0  
Beta erosion composite  KUL model only  beta_erosion_composite  Double  3  1  
Gamma erosion composite  KUL model only  gamma_erosion_composite  Double  3  0  
Angle of repose of sf2  Maximum angle that sediment can accumulate at and remain stable.  repose_sf2  Double  2  90  0  90 
Show Columns  Database Names 
Size, Type and Units  
Defaults and Error Limits 
Field Name  Help Text  Database Field  Data Type  Size  Units  Precision  Default  Error Lower Limit  Error Upper Limit  Warning Lower Limit  Warning Upper Limit  
Diffusion coefficients  Click the button to display the Diffusion Coefficients Grid.
The grid allows one diffusion coefficient to be set per sediment fraction and per dissolved pollutant. If no diffusion coefficient is specified in this table for a specific pollutant, the 2D engine will only transport it. There will not be any diffusion.
The diffusion coefficients defined in this grid are used by the 2D water quality engine only. See 1D Diffusion for Water Quality Simulations for information about the 1D diffusion coefficients. 
dcp  Structure  0 
Show Columns  Database Names 
Size, Type and Units  
Defaults and Error Limits 
Field Name  Help Text  Database Field  Data Type  Size  Units  Precision  Default  Error Lower Limit  Error Upper Limit  Warning Lower Limit  Warning Upper Limit  
Decaying pollutants  Click the button to display the Decaying Pollutants Grid.
The grid allows decay settings for a set of pollutants to be entered.

dpp  Array 
Show Columns  Database Names 
Size, Type and Units  
Defaults and Error Limits 
Field Name  Help Text  Database Field  Data Type  Size  Units  Precision  Default  Error Lower Limit  Error Upper Limit  Warning Lower Limit  Warning Upper Limit 
Calculate reaeration parameters  Calculate reaeration rate kair directly as a function of water depth and velocity  reaer_calc_params  Boolean  
Reaeration coefficient  Reaeration coefficient  reaer_coeff  Double  RE  3  0.04  
Reaeration temperature coefficient  Temperature dependency factor for reaeration  reaer_temp_coeff  Double  3  1.16  
Structure aeration coefficient  Reaeration coefficient at structures  structure_aer_coeff  Double  3  0  
UOD rate constant at 20C  Ultimate Oxygen Demand decay parameter: rate constant at 20°C (day1)  bod5_20c_decay_rate  Double  PDR  3  0.23  
UOD temperature coefficient  Ultimate Oxygen Demand decay parameter: temperature coefficient  bod5_temp_coeff  Double  3  4.7  
Organic nitrogen rate constant at 20C  Organic nitrogen decay parameter: rate constant at 20°C (day1)  org_nitr_20c_decay_rate  Double  PDR  3  0.23  
Organic nitrogen temperature coefficient  Organic nitrogen decay parameter: temperature coefficient  org_nitr_temp_coeff  Double  3  4.7  
Ammonia rate constant at 20C  Ammonia oxidation parameter: rate constant at 20°C (day1)  ammonia_20c_decay_rate  Double  PDR  3  0.26  
Ammonia temperature coefficient  Ammonia oxidation parameter: temperature coefficient  ammonia_temp_coeff  Double  3  4.7  
Salinity coefficient  Ammonia oxidation parameter: salinity coefficient  salinity_coeff  Double  3  0  
Base salinity  Ammonia oxidation parameter: base salinity  base_salinity  Double  MCSI  3  0  
Suspended solids coefficient  Ammonia oxidation parameter: base suspended solids coefficient  suspended_solids_coeff  Double  3  0  
Base suspended solids  Ammonia oxidation parameter: base suspended solids  base_suspended_solids  Double  PC  3  0  
Base suspended solids factor  Ammonia oxidation parameter: multiplication factor for base suspended solids  base_susp_solids_factor  Double  3  0  
Nitrite to nitrate rate constant at 20C  Nitrite to nitrate oxidation parameter: rate constant at 20°C (day1)  no2_20c_decay_rate  Double  PDR  3  1.0  
Nitrite to nitrate temperature coefficient  Nitrite to nitrate oxidation parameter: temperature coefficient  no2_temp_coeff  Double  3  5.0 
Show Columns  Database Names 
Size, Type and Units  
Defaults and Error Limits 
Field Name  Help Text  Database Field  Data Type  Size  Units  Precision  Default  Error Lower Limit  Error Upper Limit  Warning Lower Limit  Warning Upper Limit 
Constant concentration  Salt concentration to be used in the absence of profile data  salt_const_conc  Double  3  0 
Show Columns  Database Names 
Size, Type and Units  
Defaults and Error Limits 
Field Name  Help Text  Database Field  Data Type  Size  Units  Precision  Default  Error Lower Limit  Error Upper Limit  Warning Lower Limit  Warning Upper Limit 
Heat transfer coefficient  Heat exchange coefficient at water surface  temp_heat_transfer_coeff  Double  HT  3  0  
Equilibrium water temperature  Temperature at which there is no heat transfer between the air and the water  temp_equilib_water_temp  Double  CF  3  20  
Constant temperature  Water temperature to be used in the absence of profile data  temp_constant_temp  Double  CF  3  20 
Show Columns  Database Names 
Size, Type and Units  
Defaults and Error Limits 
Field Name  Help Text  Database Field  Data Type  Size  Units  Precision  Default  Error Lower Limit  Error Upper Limit  Warning Lower Limit  Warning Upper Limit 
T90  Time taken for 90% of the original population to decay  coliforms_t90  Double  HOURS  3  10 
User defined process parameters
Show Columns  Database Names 
Size, Type and Units  
Defaults and Error Limits 
Field Name  Help Text  Database Field  Data Type  Size  Units  Precision  Default  Error Lower Limit  Error Upper Limit  Warning Lower Limit  Warning Upper Limit  
User defined processes  Click the button to display the Process Definitions Grid.
Each named process may act on one or more determinants; click the button on User processes to create a set of determinants and factors for the process.

udp  Array 
Show Columns  Database Names 
Size, Type and Units  
Defaults and Error Limits 
Field Name  Help Text  Database Field  Data Type  Size  Units  Precision  Default  Error Lower Limit  Error Upper Limit  Warning Lower Limit  Warning Upper Limit 
Structures  Click the button to display the Structures Grid.
Set reaeration coefficients for a set of controls (excluding pumps) in the network. These values override the Structure aeration coefficient in the dissolved oxygen parameters. 
sp  Array 
Show Columns  Database Names 
Size, Type and Units  
Defaults and Error Limits 
Field Name  Help Text  Database Field  Data Type  Size  Units  Precision  Default  Error Lower Limit  Error Upper Limit  Warning Lower Limit  Warning Upper Limit 
Nitrate uptake (half saturation)  Half saturation constant for nitrate uptake  phy_n_uptake_half_sat  Double  PC  3  0.1  0  
Phosphate uptake (half saturation)  Half saturation constant for phosphate uptake  phy_p_update_half_sat  Double  PC  3  0.014  0  
Silicate uptake (half saturation)  Half saturation constant for silicate uptake  phy_s_uptake_half_sat  Double  PC  3  0.0  0  
Nitrogen to carbon ratio  Nitrogen to carbon ratio  phy_n_c_ratio  Double  3  0.16  0  
Phosphorus to carbon ratio  Phosphorus to carbon ratio  phy_p_c_ratio  Double  3  0.024  0  
Silicon to carbon ratio  Silicon to carbon ratio  phy_s_c_ratio  Double  3  0.01  0  
Gradient below critical temperature  Maximum productivity parameter – gradient below critical temperature  phy_grad_low_temp  Double  3  0.017  
Intercept below critical temperature  Maximum productivity parameter – intercept below critical temperature  phy_int_low_temp  Double  3  0.025  
Gradient above critical temperature  Maximum productivity parameter – gradient above critical temperature  phy_grad_high_temp  Double  3  0.037  
Intercept above critical temperature  Maximum productivity parameter – intercept above critical temperature  phy_int_high_temp  Double  3  1.564  
Critical temperature  Maximum productivity parameter – critical temperature  phy_crit_temp  Double  CF  3  25.0  100  100  
Solar radiation (maximum productivity)  Solar radiation for maximum productivity  phy_pmax_solar_rad  Double  SR  3  277.778  0.001  
Light extinction factor  Light extinction factor due to phytoplankton  phy_light_ext_factor  Double  3  0.85  
Respiration rate at 20C  Respiration rate at 20°C  phy_resp_rate_20  Double  PDR  3  0.02  
Respiration Q10  Q10 value for respiration of phytoplankton  phy_resp_q10  Double  3  2.2  0.001  
Mortality rate  Mortality rate constant for phytoplankton  phy_mort_rate  Double  PDR  3  0.1 
Show Columns  Database Names 
Size, Type and Units  
Defaults and Error Limits 
Field Name  Help Text  Database Field  Data Type  Size  Units  Precision  Default  Error Lower Limit  Error Upper Limit  Warning Lower Limit  Warning Upper Limit 
Decay constant at 20C  Decay constant at 20°C  phy_decay_20  Double  PDR  3  0.046  
Temperature dependency  Factor for temperature dependence  phy_temp_dep  Double  3  4.7  
Settling velocity  Settling velocity for detrital carbon  phy_sett_vel  Double  SETTL  3  0..001  0 
Adsorbed phosphorus parameters
Show Columns  Database Names 
Size, Type and Units  
Defaults and Error Limits 
Field Name  Help Text  Database Field  Data Type  Size  Units  Precision  Default  Error Lower Limit  Error Upper Limit  Warning Lower Limit  Warning Upper Limit 
Adsorption rate at 20C  Adsorption rate at 20°C  ad_rate_20  Double  PDR  3  25.0  
Temperature dependence factor  Temperature dependence factor  temp_dep_factor  Double  3  0.0  
Saturation adsorption ratio  Saturation adsorption ratio of phosphate to mud  sat_ad_ratio  Double  3  0.05  
Half saturation (Langmuir isotherm)  Half saturation constant for Langmuir isotherm  half_sat_langmuir  Double  PC  3  0.5  0 
Show Columns  Database Names 
Size, Type and Units  
Defaults and Error Limits 
Field Name  Help Text  Database Field  Data Type  Size  Units  Precision  Default  Error Lower Limit  Error Upper Limit  Warning Lower Limit  Warning Upper Limit 
Nitrate uptake (half saturation)  Half saturation constant for nitrate uptake  ben_n_uptake_half_sat  Double  PC  3  0.1  0  
Phosphate uptake (half saturation)  Half saturation constant for phosphate uptake  ben_p_uptake_half_sat  Double  PC  3  0.014  0  
Silicate uptake (half saturation)  Half saturation constant for silicate uptake  ben_s_uptake_half_sat  Double  PC  3  0.0  0  
Nitrogen to carbon ratio  Nitrogen to carbon ratio  ben_n_c_ratio  Double  3  0.16  0  
Phosphorus to carbon ratio  Phosphorus to carbon ratio  ben_p_c_ratio  Double  3  0.024  0  
Silicate to carbon ratio  Silicate to carbon ratio  ben_s_c_ratio  Double  3  0.0  0  
Solar radiation (maximum productivity)  Solar radiation for maximum productivity  ben_pmax_solar_rad  Double  SR  3  277.778  0.001  
Respiration rate at 20C  Respiration rate at 20°C  ben_resp_rate_20  Double  PDR  3  0.02  
Respiration Q10  Q10 value for respiration of benthic algae  ben_resp_q10  Double  3  2.2  0.001  
Mortality rate  Mortality rate constant for benthic algae  ben_mort_rate  Double  3  0.2 
Show Columns  Database Names 
Size, Type and Units  
Defaults and Error Limits 
Field Name  Help Text  Database Field  Data Type  Size  Units  Precision  Default  Error Lower Limit  Error Upper Limit  Warning Lower Limit  Warning Upper Limit 
Nitrate uptake (half saturation)  Half saturation constant for nitrate uptake  mac_n_uptake_half_sat  Double  PC  3  0.1  0  
Phosphate uptake (half saturation)  Half saturation constant for phosphate uptake  mac_p_uptake_half_sat  Double  PC  3  0.014  0  
Silicate uptake (half saturation)  Half saturation constant for silicate uptake  mac_s_uptake_half_sat  Double  PC  3  0.0  0  
Nitrogen to carbon ratio  Nitrogen to carbon ratio  mac_n_c_ratio  Double  3  0.16  0  
Phosphorus to carbon ratio  Phosphorus to carbon ratio  mac_p_c_ratio  Double  3  0.024  0  
Silicate to carbon ratio  Silicate to carbon ratio  mac_s_c_ratio  Double  3  0.0  0  
Solar radiation (maximum productivity)  Solar radiation required for maximum productivity  mac_pmax_solar_rad  Double  SR  3  277.778  0.001  
Productivity rate at 20C  Productivity rate at 20°C  mac_prod_rate_20  Double  PDR  3  0.5  
Growth Q10  Q10 value for macrophyte growth  mac_growth_q10  Double  3  2.2  0.001  
Loss by leaching  Proportion of dead material that is lost by leaching of nutrients  mac_loss_leach  Double  3  0.1  0  1  
Loss by exudation  Proportion of macrophyte production that is lost by exudation of nutrients  mac_loss_exude  Double  3  0.1  0  1  
Seed concentration  Seed concentration  mac_seed_conc  Double  WQ_MPA  3  0.0  0  
Mortality rate  Mortality rate constant for macrophytes  mac_mort_rate  Double  PDR  3  0.05 
Show Columns  Database Names 
Size, Type and Units  
Defaults and Error Limits 
Field Name  Help Text  Database Field  Data Type  Size  Units  Precision  Default  Error Lower Limit  Error Upper Limit  Warning Lower Limit  Warning Upper Limit 
Sulphide flux free flow (M’)  Sulphide flux coefficient for pipe flowing less than full  h2s_free_flow  Double  RE  5  0.00032  0  
Sulphide flux full flow (M)  Sulphide flux coefficient for filled pipe  h2s_full_flow  Double  RE  5  0.001  0  
Sulphide loss coefficient (m)  Coefficient to account for sulphide losses by oxidation and escape to atomsphere.  h2s_sulph_loss  Double  3  0.64  0  
Ionisation coefficient (pK1)  Coefficient determining the relative proportions of H2S and HS dependent on pH.
A pH value pK1 results in 50% of total sulphides being H2S. 
h2s_ion_coeff  Double  3  7.0  6.67  7.24  
Soluble sulphide percentage  Percentage of sulphides that are soluble.  h2s_sol_sulph  Double  3  80.0  0  100 
Categories: ICM