Audit source-labelled drain-segment fall, slope and percent grade against an already documented comparison slope—without selecting a minimum, pipe, drainage method or compliance.
A quick decision brief for this specific tool
One de-identified reviewed drain segment; named geometry, common-datum/direction and comparison-slope records; one paired feet/inches/in-per-foot or metres/millimetres/mm-per-metre unit system; positive horizontal run; and finite start/end elevations plus documented comparison slope
Source-preserving signed fall, signed slope, signed percent grade, documented comparison slope and signed reproduced-minus-comparison difference
Subtract endpoint elevation from start elevation on the named datum, divide by horizontal run and compare only with the entered source-selected slope; do not insert a quarter-inch minimum, infer direction, select pipe/drainage method or declare compliance
Choose your path
Reproduce signed drain-segment fall, slope and grade from a source-labelled horizontal run and common-datum elevations, then compare an already documented slope without selecting a minimum, pipe or compliance.
Check geometry without a fixed quarter-inch threshold replacing pipe/load/system classification.
Name the geometry, datum/direction and comparison-slope records; choose one paired unit system; inspect signed fall/slope and difference.
Can trace the segment while diameter, DFU loading, special conditions and approval remain in the complete design.
Preserve datum and direction so endpoint elevations are not silently reversed.
Select field/as-built basis, copy horizontal projection and two elevations, then compare the reproduced sign with the submitted slope record.
A negative or positive difference is arithmetic, not an automatic pass/fail or pump instruction.
Learn in/ft, mm/m and percent-grade relationships without mistaking one threshold for every drain.
Run separate US and metric education records, including a signed rise, and review explicit exclusions.
Can reproduce geometry and list pipe/load, uniformity, fittings, special systems and authority checks the tool omits.
Outputs and checklists are planning aids. Review the linked current authorities and the records, terms, instructions, and requirements that apply to your exact situation before a consequential decision.
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Horizontal run and both endpoint elevations must share an explicit measurement record and datum. The comparison slope remains owned by a separate responsible design/review; the tool never inserts a code-table value.
Record = geometry source + datum/direction source + comparison-slope sourcePositive, zero and negative signs are preserved. US records pair feet with inch elevations and in/ft; metric records pair metres with millimetre elevations and mm/m. No flow direction or drainage suitability is inferred from the sign.
Signed fall = start − end; signed slope = fall ÷ horizontal runThe signed difference is record-reconciliation arithmetic only. Diameter, DFU loading, uniform alignment, special systems, fittings, installation tolerance and adopted requirements determine whether the complete system is acceptable.
Difference = reproduced signed slope − documented comparison slopeUpdated: August 2026
A designer copies horizontal projection, endpoint elevations and the separately selected design slope. The tool exposes the arithmetic while pipe size, loading and applicable provisions remain in the design record.
A reviewer records a common datum and intended start-to-end direction before comparing surveyed elevations with the submitted slope. Uniformity between endpoints still requires field verification.
An apprentice enters metres, millimetres and mm/m for a segment whose endpoint is higher. The negative sign becomes a review question, not an automatic pump/ejector recommendation.
Reproduce one reviewed drain-segment geometry record without turning three measurements into a code verdict. Name the geometry, common datum/direction and comparison-slope sources; use one complete US or metric unit system; and inspect signed fall, signed slope, percent grade and the signed comparison difference. Pipe/load classification and approval remain in the complete design.