Erger’s Pond

Erger’s Pond

Background:

The Erger’s Pond Augmentation Station project is owned by the City of Brighton, CO and includes two intakes that move water between the South Platte River and Erger’s Pond. This unique water conveyance system is required as a part of the city’s use of alluvial groundwater wells as a main source of water and their requirement to meet “senior” water user rights downstream on the South Platte River.

The intake on the South Platte River is fitted with two C144-41EB cone screens to reduce potential impacts to fish and reduce withdrawal of debris at the point of diversion. Each cone screen measures 12-ft (3,658-mm) in diameter and 41-inch (1,041-mm) tall. The screens have 6.35-mm slot opening and a 3.18-mm wire width to create a 67 percent open area. Each screen is equipped with an electric drive assembly to rotate the external brush cleaning system. The screens are constructed from 316L stainless steel to minimize potential corrosion. Each screen has a 40 cfs (26 MGD; 4,078 m³/h) capacity based on a 0.3 fps (9 cm/s) approach velocity for a total system capacity of 80 cfs (52 MGD; 8,155 m³/h).

Benefit of ISI System

ISI's conical shaped screens enables this shallow water diversion to meet fish protection criteria by placing a large screen surface area in a relatively small project footprint. The brush-cleaning system maintains a clean screen surface and therefore maintains the regulatory required approach velocity during water diversion. Use of 316L stainless steel for screen construction provides protection against the potentially corrosive waters in this system.

Owner:

City of Brighton

Engineer(s):

Burns & McDonnell

General Contractor:

Aslan Construction, Inc

Location:

South Platte River, Brighton,CO