Aqualf

Aqualf is a professional field data entry app specifically for completing the USACE Midwest Region Wetland Determination Data Form (Version 2.0). Built by a Professional Wetland Scientist for environmental consultants and agencies on a budget! It replaces paper forms with a structured digital workflow designed to work entirely offline. No account, no internet, and no data ever leaving your device.

WHAT AQUALF DOES

-Project Management: Create projects and manage multiple sample plots per site.
-Structured Entry: Enter field data across four tabs per plot: Hydrology, Vegetation, Soils, and Summary.
-Auto-Calculations: Instant dominance test, prevalence index, and FAC-neutral test results as you enter vegetation data.
-Hydric Soil Engine: Suggests hydric soil indicators (A1–F21) based on horizon data, evaluated against USDA NRCS Field Indicators of Hydric Soils v9.0 (2024).
-Field Warnings: Flags complex indicators (A18, S6, F8, F12, F21) that require specific field confirmation, landform context, or regional testing before application.
-Official PDF Export: Generates a multi-page PDF that mirrors the official USACE Midwest v2.0 form layout, ready for report attachment or permit application.
-Seamless Sharing: Export via AirDrop, Files, email, or any standard iOS share sheet destination.

PLANT DATABASE

-Primary: 2,860-species Midwest National Wetland Plant List (USACE, 2022 edition).
-Fallback: 37,109-species USDA PLANTS database for species not found on the regional NWPL (defaults to UPL).

SOIL INDICATOR ENGINE

-Suggestions are evaluated against USDA NRCS v9.3 (2026) criteria for the Midwest region, covering A, S, and F indicators. Tap any info button for the full criteria and technical field notes.

FORM COVERAGE

Full coverage of the Midwest v2.0 data form:

-Project and site header (including Section, Township, and Range/PLSS).
-All hydrology primary and secondary indicators with specific depth fields.
-All four vegetation strata.
-Detailed soil profiles with up to 12 horizons including matrix and redox data.
-All standard and problematic hydric soil indicators.
-Summary of findings and final determination.

PRIVACY

No backend, no account, and no telemetry. All field data is stored locally in SQLite on your device and is never transmitted to external servers. Only standard Apple App Store analytics (crash reports and performance) are collected.

SCOPE & DISCLAIMER

This version covers the USACE Midwest Region only. iOS only. For professional use by qualified wetland scientists.

Aqualf has not been reviewed, approved, or endorsed by the U.S. Army Corps of Engineers, USDA-NRCS, or any other federal or state agency; no such review or approval has been sought or is implied. It is a field data entry tool and does not replace professional judgment or constitute a formal wetland delineation. The user assumes all responsibility for the accuracy and appropriate use of exported data.