Plumbing Sewer Slope Calculator
Audit actual station/invert sewer profile with signed downstream slopes and caller criterion; not generic two-point slope, self-cleansing guarantee, datum transformation or geodesy.
Description
Downstream sewer slope is the fall in invert elevation divided by station distance.
Downstream sewer slope is the fall in invert elevation divided by station distance. A rise produces a negative slope.1
The returned values include Signed observed sewer slopes, Segments below caller slope. The How section below explains the calculation, input rules and interpretation.
When to use Plumbing Sewer Slope Calculator
Use Plumbing Sewer Slope Calculator when you need to evaluate the supplied records under the calculation and evidence rules below. No datum transformation, self-cleansing guarantee or profile surveying is supplied.
Prepare measured flows, pressures, temperatures or inventories with consistent units. For catalog tools, use independently verified capacities at the stated operating conditions and supply the explicit design demand.
How to use Plumbing Sewer Slope Calculator and understand its results
- Prepare measured flows, pressures, temperatures or inventories with consistent units. For catalog tools, use independently verified capacities at the stated operating conditions and supply the explicit design demand.
- Enter observedSewerStationDistancesM, observedInvertElevationsM, callerMinimumDownstreamSlope using the field table and calculation rules, then run the tool.
- Read signedObservedSewerSlopes, segmentsBelowCallerSlope. The explanation below defines the units, signs, ordering and any flags or placeholder values.
- If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.
| Input field | Meaning | Value type; see rules below | Requirement |
|---|---|---|---|
| observedSewerStationDistancesM | Observed sewer station distances m | list of number | Required |
| observedInvertElevationsM | Observed invert elevations m | list of number | Required |
| callerMinimumDownstreamSlope | Caller minimum downstream slope | number | Required |
Enter aligned finite station and invert lists with at least two strictly increasing stations, plus a nonnegative minimum slope. Return signed slopes and zero-based segment indexes strictly below the minimum.
slope_i=(invert_i−invert_next)/(station_next−station_i) Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| signedObservedSewerSlopes | Signed observed sewer slopes | list of number |
| segmentsBelowCallerSlope | Segments below caller slope | list of number |
{
"input": {
"observedSewerStationDistancesM": [
0,
10,
30
],
"observedInvertElevationsM": [
5,
4.9,
4.5
],
"callerMinimumDownstreamSlope": 0.015
},
"output": {
"signedObservedSewerSlopes": [
0.009999999999999964,
0.020000000000000018
],
"segmentsBelowCallerSlope": [
0
]
}
}Limitations and assumptions
No datum transformation, self-cleansing guarantee or profile surveying is supplied.
Numeric inputs, where present, must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Numeric lists are limited to 10,000 entries; string lists to 128 strings of at most 128 characters each. The rules above may impose smaller limits. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.
Alternative or Complementary methods
Use Plumbing Sewer Velocity At Full Flow Calculator: The SI Manning equation estimates gravity-driven full circular-pipe velocity using hydraulic radius D/4. This assumption differs from pressurized flow. For a complementary task, use Plumbing Trap Arm Length Calculator: A trap-arm catalog can provide separate limits for developed length and fall. Checking both dimensions preserves the limiting margin.
References
-
Plumbing Sewer Slope Calculator — tool.io
Similar or alternative tools
- Plumbing Sewer Velocity At Full Flow Calculator
The SI Manning equation estimates gravity-driven full circular-pipe velocity using hydraulic radius D/4. This assumption differs from pressurized flow.
- Plumbing Trap Arm Length Calculator
A trap-arm catalog can provide separate limits for developed length and fall. Checking both dimensions preserves the limiting margin.