When you are using FishXing there will be many decisions that will be made that depend on the type of application you are using.


Before Using FishXing establish the goal of the analysis:

Large Scale assessment?

Single site evaluation for fish passage?

Design of a new or replacement crossing?


Data Collection

An assessment for fish passage requires detailed information about the crossing from a field survey

A new design requires less data, but necessitates a better understanding of the channel, aquatic species and engineering practices.

Collect and analyze hydrologic data for determining design flows and fish passage flow range.

Conduct survey and hydrologic analysis for tailwater methodology


Data Input

Enter basic Site Information

Determine fish passage conditions, is passage determined by swimming ability or hydraulic criteria?

Enter Culvert data either actual or for design alternatives, determine culvert characteristics like dimension, inlet type and material roughness.

Select Tailwater method; Constant, Rating Curve, or Cross Section.

Enter Design flows



Interpretation of Results