GradePin Drainage Layout

GradePin turns entered station elevations into a readable drainage grade run and stake sheet. • Compare existing ground and design on an axis-labelled longitudinal profile. • Select a station and keep its existing level, design level and cut or fill together. • Edit, add, delete and sort stations in a numerical schedule. • Check each segment for reverse grade, flat grade or fall below your entered minimum. A positive average cannot hide a rising section. • Review and apply a straight grade from a start elevation and fall percentage while preserving existing levels and notes. • Change between metres and international feet without changing the physical run. • Open large single-station stake cards and move through them on site. • Create a native PDF with the profile, schedule, checks and printable stake cards, plus UTF-8 CSV and portable JSON. • Preview, save through Android’s document picker or open a share sheet. • Import Android backups and original iOS GradePin single-run JSON as independent copies. A tablet keeps the profile, station schedule and selected-station facts together. The production library starts empty; the optional West swale example is fictional and editable. Paid once. No ads, subscriptions, account, analytics or cloud service. Runs stay on your device. Device backup is disabled; keep exported JSON copies separately. Manual planning only. No GPS, survey instrument connection, hydrology, earthwork volume, code compliance or construction certification. Your entered minimum is not an engineering recommendation. Confirm datum, units, measurements and site requirements. Plot vertical scale is automatic and labelled, not true aspect. International feet use 1 ft = 0.3048 m; historical US survey feet are not supported. Library limits: 15 runs, 200 stations and four export sets per run; 4 MiB JSON imports and a 128 MiB local export workspace.

Initial Android release. Plan station elevations, inspect the profile and every segment, then save a PDF stake sheet, CSV and portable JSON. Offline manual planning with no ads or subscriptions.