Services include Analyses, Recommendations, and Design
Background
The City of San Bernardino Municipal Water Department (Department) owns and operates the Ogden Pump Station (OPS). The original system configuration was designed as an inline booster network. The system starts at Scotts Lab which boosts the HGL to approximately 1411’ above mean sea level. The discharge of Scotts Lab, which becomes the suction side of OPS, is known as the 1416’ Pressure Zone.
The Scotts Lab PS discharges into approximately 10,000 linear feet of 36” ductile iron pipe, which then makes its way into the suction side of the OPS. At Ogden, vertical turbine pumps boost the pressure to the College/Palm 1720’ Pressure Zone. The main discharge pipeline of Ogden is approximately 15,000 feet long and feeds the Palm Avenue Reservoirs, which typically vary from 1707’ to 1713’ in elevation. This overall static lift from Ogden equates to approximately 300’ of nominal head (or 130 psi). The results of the analytical model developed in 2005 by the original designer of the OPS utilized an H2OMap database that was subsequently converted to Surge 2000 software. The surge model requires both Ogden and Scotts Lab to have transient surge protection on both the suction side and the discharge side.
Situation
In January 2019, a 12-inch meter flange failure caused damage to the OPS facility and the neighboring property. The flange failure resulted in a high-pressure water discharge that released approximately 163,200 gallons of water to the interior and exterior of the building. Water penetrated and discharged through the roof, causing an overflow to the adjacent concrete reservoir located 100 feet outside of the pump building and to the neighboring property. The interior of the building was flooded with up to 18 inches of water causing damage and safety concerns to the electrical equipment located adjacent to the pumps inside the building.
Scope of Work
LEE + RO’s services include data collection, pump station evaluation, condition assessment, and preparing a preliminary design report (PDR). LEE + RO will then provide design documents so that the Department’s in-house staff can replace and/or repair the damaged equipment, and then commission the pump station to bring it back into service.
