Natural Resources Conservation Service Micro Design Considerations NRCS Standards, Specifications & References v PS and GS 380 Windbreak/Shelterbelt Establishment  …supplemental or permanent watering of the planting will be evaluated in areas with less than 20 inches average annual precipitation……  … Use Idaho Forestry TN 14 (12/93) for water requirements.  soak soil to 3 to 5 ft depth  MAD of 50 to 60%  if poly fabric mulch used, supplemental water use may be reduced by up to 50% v PS 441 Irrigation System, Trickle ('82)  design application efficiency not to exceed 90%  for individual laterals, individual emitter q ± 15% of average q  main and submains must meet PS 430  A filtration system shall be provided…..
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