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<br />1.0 INTRODUCTION <br /> <br />1.1 Purpose <br /> <br />The purpose of the catalog is to assist local government officials and others in finding the <br />closest vertical control benchmark or reference mark for use in determining base flood (100- <br />year) elevations at specific sites in Colorado, <br /> <br />1.2 Scope <br /> <br />The scope of this project includes all known "benchmarks" and "reference marks" for those <br />communities in Colorado which are participating in the National Flood Insurance Program <br />(NFIP), The CWCB has attempted to include benchmark and reference mark data for all 63 <br />counties in the state of Colorado, <br /> <br />1.3 Authority <br /> <br />This task was supported by funding through the Federal Emergency Management Agency <br />(FEMA) Cooperative Agreement No, EMD-90-K-0125 as part of the Community Assistance <br />Program-State Support Services Element of the National Flood Insurance Program, The <br />substance and findings herein are dedicated to the public, The contents do not necessarily <br />reflect the views and policies of the federal government, The CWCB is the state coordinating <br />agency for the NFIP in Colorado, <br /> <br />1. 4 Sources <br /> <br />The CWCB considered three (3) sources in compiling this database, <br /> <br />In the fall of 1989, the CWCB sent out a request for vertical control data to communities in <br />the state which are participating in the National Flood Insurance Program, Thirty-seven <br />communities which have vertical control networks responded, <br /> <br />The CWCB secured benchmark data from the NatiOnal Geodetic Survey (NGS), formerly <br />known as the U,S, Coast and Geodetic Survey, This data included USGS benchmark <br />information as well as its own sources of data, The CWCB obtained elevation data in a <br />digital format from the NGS to combine with the data from Colorado community officials. <br /> <br />The CWCB also reviewed the collection of monument descriptions on file with the Colorado <br />State Board of Registration for Professional Engineers and Professional Land Surveyors <br />Board, The PE&LS Board has collected well over 73,000 monument descriptions since 1970, <br />However, these records have not been tabulated, and they are only available on the original <br />single sheets of paper as submitted by various engineers and surveyors, It was beyond the <br />scope of this project to computerize this important database. <br /> <br />1 <br />