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Distance from septic system to the stream
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Linear coefficient for calculation of field capacity in the biozone
Exponential coefficient for calculation of field capacity in the biozone
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Conversion factor for plaque from Total Dissolved Solids
Mortality rate coefficient
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Linear coefficient for calculating the rate of biomass sloughing
Exponential coefficient for calculating the rate of biomass sloughing
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Maximum P sorption capacity
Slope of the linear effluent soluble P equation
Intercept of the linear effluent soluble P equation
Name of septic system record
The name of the septic system record is a primary key referenced by sep in landuse.lum. All names in the septic.str file must be unique.
Number of permanent residents in the house
The number of permanent residents for a typical US residence is 2.5.
Average area of drainfield of individual septic systems
The typically recommended drainfield area per person is about 40 to 70 square meters. This varies from state to state in the United States. For a household with 2.5 people, a drainfield area of 100 square meters is generally recommended. Users can modify the area based on the number of people in a household. The parameters area and cap may be modified appropriately to study the effects of a larger population size using septic systems.
Septic system type
The septic system type is a foreign key referencing name in septic.sep.
| Name | Description |
|---|---|
Septic system operation flag
| Option | Description |
|---|
An active system automatically becomes failing as the biozone layer gets clogged over time. A failing system turns to an active system after the user specified number of days for rehabilitation defined by .
GCON
Generic type conventional system
GADV
Generic type advanced system
COND
Septic tank with conventional drainfield
SAS1
Septic tank with sand absorption system 1
SAS2
Septic tank with sand absorption system 2
SAS3
Septic tank with in-tank N removal and sand absorption system
SAS4
Septic tank with effluent N removal recycle
SAS5
Septic tank with corrugated plastic trickling filter
SAS6
Septic tank with open-cell form trickling filter
SPF1
Single pass sand filter 1
SPF2
Single pass sand filter 2
SPF3
Single pass sand filter 3
SPF4
Single pass sand filter 4
RCF1
At grade recirculating sand filter
RCF2
Maryland style recirculating sand filter
RCF3
Recirculating sand filter
CWT1
Septic tank w/ constructed wetland and surface water discharge
CWT2
Municipal wastewater w/ constructed wetland and surface water discharge 1
CWT3
Municipal wastewater w/ constructed wetland and surface water discharge 2
CWT4
Municipal wastewater w/ constructed wetland
CWT5
Municipal wastewater w/ lagoon and constructed wetland
BFL1
Waterloo biofilter (plastic media) 1
BFL2
Waterloo biofilter (plastic media) 2
BFL3
Peat biofilter
TXF1
Recirculating textile filter
TXF2
Foam or textile filter effluent
GFL1
Septic, recirculating gravel filter, UV disinfection
USPT
Untreated Effluent - Texas A&M reference
0 | Not operational |
1 | Active |
2 | Failing |
Thickness of biozone layer
The biozone layer is thin soil layer underneath the septic tank effluent (STE) distribution chamber where pollutants are degraded by naturally existing live biomass bacteria.
Year the septic system became operational
If 0 is input for yr, the model assumes the septic system is in operation at the beginning of the simulation.
Conversion factor representing the proportion of mass bacterial growth and mass BOD degraded in the septic system
BOD decay rate coefficient
Biozone BOD coefficient is normalized by the volume of biomass in the formula.
Density of biomass
Time until failing systems gets fixed
An active system becomes failing as the biozone gets clogged and hydraulic failure occurs. A failing system automatically turns active during the simulation and septic parameters are re-initialized to default values after the specified number of days for rehabilitation. For testing long term failure, t_fail can be increased as per the failing duration. The parameter should be set to 2 for simulating failing conditions.
Depth to the top of the biozone layer from the ground surface
The thickness includes the top soil layer and septic tank effluent (STE) distribution chamber including perforated pipe.
Number of septic systems per square kilometer
This file contains the septic system parameters.
Data contained in the septic.str data file are: type of septic system, geometry of biozone, characteristics of biomass, and bio-physical reaction coefficients occurring in the biozone (adapted from Siegrist et al. (2005)).
| Field | Description | Type | Unit | Default | Range |
|---|---|---|---|---|---|
Siegrist, R.L., J. McCray, L. Weintraub, C. Chen, J. Bagdol, P. Lemonds, S. Van Cuyk, K. Lowe, R. Goldstein, and J. Rada (2005): Quantifying Site-Scale Processes and Watershed-Scale Cumulative Effects of Decentralized Wastewater Systems. Project No. WU-HT-00-27. Prepared for the National Decentralized Water Resources Capacity Development Project, Washington University, St. Louis, MO, by the Colorado School of Mines.
Name of septic system record
string
n/a
n/a
n/a
Septic system type
integer
n/a
0
Year the septic system became operational
integer
n/a
0
Septic system operation flag
integer
n/a
0
0-2
Number of permanent residents in the house
real
n/a
1
1.0-12.0
Average area of drainfield of individual septic systems
real
m^2
1
Time until failing systems gets fixed
integer
days
0
0-150
Depth to the top of the biozone layer from the ground surface
real
mm
1
Thickness of biozone layer
real
mm
1
Distance from septic system to the stream
real
km
2
Number of septic systems per square kilometer
real
n/a
2
Density of biomass
real
kg/m^3
1
BOD decay rate coefficient
real
m^3/day
2
Conversion factor representing the proportion of mass bacterial growth and mass BOD degraded in the septic
real
n/a
2
Linear coefficient for calculation of field capacity in the biozone
real
n/a
1
Exponential coefficient for calculation of field capacity in the biozone
real
n/a
2
Fecal coliform bacteria decay rate coefficient
real
m^3/day
2
Conversion factor for plaque from TDS
real
n/a
2
Mortality rate coefficient
real
n/a
2
Respiration rate coefficient
real
n/a
3
Linear coefficient for calculating the rate of biomass sloughing
real
n/a
2
Exponential coefficient for calculating the rate of biomass sloughing
real
n/a
2
Nitrification rate coefficient
real
n/a
2
Denitrification rate coefficient
real
n/a
3
Linear P sorption distribution coefficient
real
L/kg
1
Maximum P sorption capacity
real
mg P/kg soil
1
Slope of the linear effluent soluble P equation
real
n/a
3
Intercept of the linear effluent soluble P equation
real
n/a
3
Linear P sorption distribution coefficient
Fecal coliform bacteria decay rate coefficient
Biozone fecal coliform coefficient is normalized by the volume of biomass in the formula.
Denitrification rate coefficient
The biozone denitrification rate coefficient is normalized by the volume of biomass in the formula.
Respiration rate coefficient
Nitrification rate coefficient
The biozone nitrification rate coefficient is normalized by the volume of biomass in the formula.