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. MASTER DRAINAGEW A Y PLAN PIONEER DITCH AT STERLING, COLORADO December 1995 1. INTRODUCTION 1.1 This study was conducted by the Corps of Engineers for the City of Sterling, Colorado, under the Corps' Planning Assistance to States (PAS) Program. Section 22 of the Water Resources Development Act of 1974 (Public Law 93-251), as amended, defines the PAS Program (also called the Section 22 Program) and provides the authority for the Corps to cooperate with States, their subentities, and Indian tribes in planning for the development, utilization, and conservation of water and related land resources. This study, initiated in fiscal year 1992, was cost-shared on 70-percent Federal/30-percent non-Federal basis between the Corps and the City of Sterling. 1.2 The focus of this study was to provide technical information to the City of Sterling concerning flood reduction measures along Pioneer Ditch. The design alternatives presented in this document include a detention pond, a channel improvement option, and some bridge improvements or replacements. Although Sterling is flooded by Sand Creek and Pawnee Creek overflows, these alternatives were designed based on the future conditions 10-year local drainage flood described in the document referenced in paragraph 2.3 below. 2. DATA SOURCES 2.1 Ploon Pl~in Tnform~tion ~nn nr~in~ge PI~n for S~nn f:rf'.ek ~nn the P~wnf'.e f:rf'.ek Overflow M Sterling, f:olor~no. By Charles F. Leaf, P.E., and Resource Consultants, Inc., for the City of Sterling and the Colorado Water Conservation Board. Dated May 1983. 2.2 SlImm~ry Report, Ploocl Pl~in Tnform~t;on ~nn nrnin~ee PI~n for S~nn C'rf'.ek ~nn thp. P~wnf'.e f:rp.p.k OVP.rf1ow M Sterling, C'olor~no. By Charles F. Leaf, P.E., and Resource Consultants, Inc., for the City of Sterling and the Colorado Water Conservation Board. Dated January 1987. 2.3 Propo<p.tl Nf'~r-Tp.rm Tmprovp.mp.nt. ~nn OpP.rM;on of Pionp.p.r nitch, Stp.rline, f:olor~no. By Charles F. Leaf, P.E., for the City of Sterling and the Colorado Water Conservation Board. Dated July 1988.