@misc{indiciaef19820b6717a,
  title = {Computer program NCALC user's manual; verification of Manning's roughness coefficient in channels},
  author = {R.D. Jarrett and H.E. Petsch},
  year = {1985},
  doi = {10.3133/wri854317},
  url = {https://pubs.usgs.gov/publication/wri854317},
  note = {Source identifier: wri854317}
}