Hydraulic Transient Computer Model for San Diego Water Authority

Abstract

San Diego County Water Authority is a water wholesaler providing a safe and reliable water supply to its 24 member agencies in the San Diego region. The Water Authority supplies up to 90% of San Diego County's water, which serves more than 3 million residents. The water supply system includes approximately 300 miles of open channel and pressurized pipelines, ranging from 48 to 108 inches in diameter, 103 active meter connections, 7 pumping stations, 4 hydroelectric facilities, one water treatment plant, and one reservoir. These facilities were constructed over the last 60 years through a sequence of individual projects, resulting in a complex hydraulic distribution system. DHI, Inc. and Franklin DeFazio, Inc. have been working together to develop a dynamic transient flow model that will be suitable for modeling the Water Authority's conveyance and distribution system. The dynamic transient simulation model will also be used to analyze and simulate relevant appurtenant facilities of other local agencies that have a significant hydraulic influence upon the Water Authority's system. The work includes modification to an existing Hydraulic Transient Engine known as FG3D (Flow Gradient Dynamics Inc.) which is incorporated into a MIKE URBAN (DHI, Inc.) hydraulic model to provide an integrated modeling system. The project includes substantial programming of menus and tools, as well as additional functionality in the Transient Model code. The transient model will be verified on pilot reaches, including the Second Aqueduct untreated water pipelines from Twin Oaks Valley Flow Regulatory Structure (TOVFRS) to Otay Lake (135 miles) in conjunction with the Olivenhain Pipeline and Pump Station. The outline of this ongoing project, as well as the experience from hydraulic transient computing and development is discussed in this paper.

Original document

The different versions of the original document can be found in:

• http://pdfs.semanticscholar.org/d05c/0bb4b6367312980a9bcbccc9287e25bf5aed.pdf

• http://ascelibrary.org/doi/pdf/10.1061/41203%28425%2917,

http://dx.doi.org/10.1061/41203(425)17

• https://ascelibrary.org/doi/abs/10.1061/41203%28425%2917,

https://www.dhigroup.com/upload/mikebydhi2010abstracts/A003_HYDRAULIC_TRANSIENT_COMPUTER_MODEL_FOR_SAN_DIEGO.pdf,

https://academic.microsoft.com/#/detail/1991745103