Using the subtract-10 method, calculate the PDP for 200′ (60 m) of 2.5″ (64-mm) hose with a 1″ (25-mm) smooth-bore tip. January 6, 2016 datapro Using the subtract-10 method, calculate the PDP for 200′ (60 m) of 2.5″ (64-mm) hose with a 1″ (25-mm) smooth-bore tip.