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<br />TABLE OF CONTENTS <br /> <br />paqe <br /> <br />I. <br /> <br />INTRODUCTION <br /> <br />. . . . . . . . . . . . . . . <br /> <br />. 1-1 <br /> <br />II. NATIONAL FLOOD INSURANCE PROGRAM BACKGROUND 11-1 <br /> <br />III. APPLICABLE NATIONAL FLOOD INSURANCE PROGRAM FLOODPLAIN <br />MANAGEMENT REQUIREMENTS IN APPROXIMATE ZONE A AREAS 111-1 <br />Requirements for Obtaininq Base (10o-year) <br />Flood Elevation Data . . . . . . . . 111-1 <br />Requirements for Developinq Base (10o-year) <br />Flood Elevation Data . . . . . . . . 111-2 <br />Use of Draft or preliminary Flood Insurance <br />Study Data . . . . . .. ...... III-7 <br />Advantaqes of Developinq Base (100-year) <br />Flood Elevation Data . . . . . . . 111-8 <br /> <br />IV. OBTAINING EXISTING BASE (100-YEAR) FLOOD ELEVATIONS IV-1 <br />Federal Emerqency Manaqement Aqency IV-1 <br />Other Federal Aqencies . . . . IV-3 <br />Other State and Local Aqencies IV-4 <br /> <br />V. <br /> <br />DEVELOPING BASE (100-YEAR) FLOOD ELEVATIONS <br /> <br />V-1 <br /> <br />simplified Methods <br />Contour Interpolation <br />Data Extrapolation <br /> <br />V-1 <br />V-2 <br />V-7 <br /> <br />Detailed Methods <br />Topography <br />Existing Topographic Maps <br />Datum Requirements for Field Surveys <br />Number of Cross sections Required <br />Proper Location of Cross sections <br />Hydrology . . . . . . . . . . . . . . . . <br />Discharge-Drainage Area Relationships <br />Regression Equations . . <br />TR-55 . . . . . . . . . <br />Rational Formula . . . . <br />Other Hydrograph Methods <br />Hydraulics . . . . <br />Normal Depth .... <br />critical Depth .... <br />Step-Backwater Analysis <br />Hydraulic Structures <br /> <br />V-ll <br />V-ll <br />V-ll <br />V-12 <br />V-13 <br />V-13 <br />V-15 <br />V-16 <br />V-19 <br />V-20 <br />V-20 <br />V-21 <br />V-22 <br />V-23 <br />V-26 <br />V-28 <br />V-28 <br /> <br />VI. OBTAINING LETTERS OF MAP CHANGE <br /> <br />VI-I <br /> <br />ii <br />