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I I I I I II I ,I I I' I I I I I II I, I. I CHAPTER I INTRODUCTION Authorization The Niver Creek drainage study was authorized under the terms of a con- tract dated 18 September 1972, between Engineering Consultants, Inc., Denver, Colorado, and the Urban Drainage District, the City of Federal Heights, the City of Thornton and Adams County, all of Colorado. Study Area Niver Creek is located within the boundaries of Federal Heights, Thorn- ton and Adams County. It extends from Federal Boulevard, at its western extremity, to the South Platte River. Basically, the land adjacent to the creek is undeveloped in Federal Heights but it is urbanized in Thornton and Adams County. A map of the project area showing municipal boundaries is presented on Plate 1-1. Project History The Niver Creek Drainage Study is divided into two stages, Phose A and Phase B. Phose A consisted of developing the hydrology of the creek basin, in- vestigating the effects of various frequency floods on the drai nageway and its adj 0- cent lands, and the development of alternative plans for improvements to reduce flood damage. Notice to proceed with Phase A was given in a letter from the Dis- trict dated November 6, 1972. The Phase A report, "Water and Drainage at Niver Creek" was published in June 1973. The report recommended the adoption of Alternative C for further study under Phase B. Alternative C consists of construct- ing two detention ponds, one on Tributary L where it crosses Interstate 25 and the other on Niver Creek where it crosses East 88th Avenue. The scheme also called for upstream and downstream channel improvements. The Phase A report was for- mally accepted at a meeting held in the District's offices on August 14, 1973. 1-1