Detention Basins
  Tucson Drainage | Upper Duck Creek | Etiwanda Debris Basin

Tetra Tech was commissioned by a private development corporation to design a flood control detention basin on Duck Creek in Clark County, Nevada.  The detention basin for this 48.5‑square‑mile drainage area consists of an embankment 54 feet high, with a capacity of 2,700 acre-feet to control the 100-year flood.  The spillway is designed to pass the probable maximum flood of 92,000 cfs.  The basin and embankment are designed to balance the quantities of excavated materials and embankment fill.  Project features include a diversion structure, an inlet, a spillway lined with roller compacted concrete, soil cement embankment facing, an outlet works, and a stilling basin downstream of the spillway and outlet works.  Project deliverables consisted of a design memorandum; a dam failure analysis report; and construction drawings, specifications, and bid documents.  This project was reviewed and approved by Clark County Regional Flood Control District, Clark County Department of Public Works, and the Nevada State Engineer’s Dam Safety Office.  The $9 million project is under construction, and Tetra Tech is performing construction management and quality assurance for the owner.