Description
Compute downstreamElevation+jointLipHeight-upstreamElevation for effectiveStep and subtract it from suppliedAllowedStep for margin.
A level reading is measured relative to an origin or datum. Adding an offset can express the same supplied observation in another compatible coordinate, while changing the reference label alone does not transform a datum.
Compute downstreamElevation+jointLipHeight-upstreamElevation for effectiveStep and subtract it from suppliedAllowedStep for margin.
When to use this tool
Use NFT Channel Step Joint Height Gap when you need one signed level, datum, or reference comparison.
How to use the tool and how it works
- Enter upstreamElevation, downstreamElevation, jointLipHeight, suppliedAllowedStep. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read effectiveStep, margin. Use the output convention below.
Compute downstreamElevation+jointLipHeight-upstreamElevation for effectiveStep and subtract it from suppliedAllowedStep for margin.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| upstreamElevation | Upstream Elevation | Required. Finite number. |
| downstreamElevation | Downstream Elevation | Required. Finite number. |
| jointLipHeight | Joint Lip Height | Required. Finite number; minimum 0. |
| suppliedAllowedStep | Supplied Allowed Step | Required. Finite number. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| effectiveStep | Effective Step | Required. Finite number. |
| margin | Signed allowance remaining under the stated subtraction order. | Required. Finite number. |
{
"input": {
"upstreamElevation": 10,
"downstreamElevation": 9,
"jointLipHeight": 2,
"suppliedAllowedStep": 2
},
"output": {
"effectiveStep": 1,
"margin": 1
}
}Limitations and assumptions
- Joint lip is nonnegative and all heights share one datum and unit; a nonnegative margin only meets the supplied step allowance, without establishing drainage or safe operation.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Verify the survey references, measurement direction, and calibration before using levels in an operational decision.
References
Similar or alternative tools
- NFT Channel Grade End Height Term
Multiply nonnegative length by signed slope for heightDifference and subtract it from inletHeight for outletHeight.
- Hydroponic Return Pipe Slope Clearance
Subtract run times signed slope from startingHeight for endCenterHeight, then subtract pipeRadius and obstacleHeight for clearance.