I HAVE USED TR-55 QUITE FREQUENTLY AT WORK, FOR USE IN DRAINAGE ANALYSIS OF SUBDIVISIONS, AND COMMERICIAL SITES. mOST OF THE WORK I DO IS IN WESTCHESTER, NEW YORK. IT HAS BEEN ENCOURAGED BY THE TOWN AND DEP TO USE 150' AS THE VALUE FOR SHEET FLOW. ALTHOUGH 300' IS ALLOWABLE, TAKING CONSERVATIVE...