Quality hydro-conditioning of the DEM is an essential first step for using the ACPF as it serves as the foundation for defining the stream network and catchments. Correct stream networks and catchment boundaries are critical for generating useful results from the practice siting tools. An incorrect stream network can also create confusion if shown to people familiar with the landscape.

Use cuts and dams correctly: Sometimes they need to be made outside the watershed boundary. Look for and fix illogical results. (See Cuts and Dams.)
Use pour points to ensure accurate definitions of catchments and watersheds. (See Pour Points.)
Include boundaries for wide rivers and water bodies. This is necessary to get accurate flow networks and catchment boundaries for riparian assessments. (See Wide Rivers.)
See the ACPF Forum for more tips on hydro-conditioning in special situations, including the following:
- Low relief or tile-drained areas
- Ponds
- Non-headwaters watersheds