Nachmessen: Drip Checks

Uneven water distribution across drip irrigation lines can lead to underwatered crops, wasted water, and unnoticed emitter clogging. Nachmessen provides a structured field tool for farmers and irrigation technicians to measure water discharge from individual drip emitters, calculate distribution uniformity, and evaluate line performance directly from catch-can measurements.

Block Setup and Planning
Create field blocks by defining lateral counts and outlets per lateral. Enter your nominal operating pressure, emitter model notes, and compensation type (Pressure-compensating, Not pressure-compensating, or Not sure). Review test instrument tolerances for collection containers, pressure gauges, and timers, and view a planned sampling pattern distributed across line inlets, midpoints, and ends.

Catch-Can Measurement Entry
Conduct field collections at planned outlets along each lateral. Measure catch-can water volume in milliliters or liters using a built-in stopwatch timer or manual elapsed seconds. Enter pre-collection and post-collection lateral pressure readings in kilopascals. Record collection outcomes as valid, spilled, overflowed, or interrupted to keep field records clean. Entered observations are saved directly to your device.

Discharge and Uniformity Calculations
Nachmessen calculates emitter flow rates in liters per hour (L/h) from volume and duration inputs. When four or more valid outlets are recorded in a run, the app computes low-quarter distribution uniformity (DU_lq) along with mean discharge and discharge ranges. If instrument tolerances are specified, the app calculates conservative uncertainty intervals for the uniformity metric.

Field Findings and Next Steps
Review calculated findings that highlight flow departures, low-flow emitters, elevated discharge, potential clogging, and pressure variations along the line. The app indicates recommended next measurement points to help you confirm differences or complete sampling coverage across the block.

Revisions and History
Inspect outlet details, review previous attempts, and record revisions with parent history maintained. Finalize completed measurement runs with an immutable snapshot and verification hash to protect records against accidental edits.

Example Block
Explore an included example block to review sample layouts, uniformity metrics, and investigation findings.

Nachmessen is a calculation tool for field measurements, not a replacement for professional irrigation engineering.

Contact: www.saifullah.ai@gmail.com