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Library Card

Haston, David ; McKenzie, Dan . 2006. Friction Loss in Wildland Hose Lays. 0651 1309P. San Dimas, CA: U.S. Department of Agriculture, Forest Service, San Dimas Technology and Development Center.

Wildland fire engine operators should understand friction loss fundamentals and be able to determine a reasonable estimate of friction loss in order to set pump discharge pressure (PDP) on a wildland fire engine correctly.

Friction loss in a hose lay is complex. However, reasonable estimates, based on engineering principles, can be determined easily. This Tech Tip introduces methods for determining friction loss, discusses friction loss of appliances, and provides techniques for reducing friction loss. Additionally, this Tech Tip provides the following appendix information:

  • Rules of thumb for hydraulics, appendix A.
  • Technical information on friction loss, appendix B.
  • The calculation method for determining friction loss, appendix C.


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