SCH Number 2015041013

Title: Twin Creek Orange Show Road Storm Drain Project
Description: The City is proposing to replace the existing storm drain to increase capacity and serve the design flow of the proposed developments in the area. The design flow for this project is the 100 year storm event and the ultimate downstream design flow for this project is 1,275.9 cfs. This proposed system will consist of reinforced concrete box (RCB) and RCP components. The proposed system will allow for a discharge of 1,276 cfs into Twin Creek. The proposed project is the expansion of the storm drain system in Orange Show Road to increase capacity. The existing storm drain currently located in the Orange Show Road roadway will be replaced with a 12' x 9' RCB storm drain and a new outfall structure will be located at the same location as the existing structure in Twin Creek. A concrete headwall and wing walls and grouted rip rap pad will be installed at the outfall structure to prevent channel erosion caused by high velocity flows (the expected velocity at the downstream end of the outlet structure is approximately 5.3 feet per second).

2 documents in project

Type	Lead/Public Agency	Received	Title
NOD	City of San Bernardino	6/16/2015	Twin Creek Orange Show Road Storm Drain Project - Mitigated Negative Declaration
MND	City of San Bernardino	4/2/2015	Twin Creek Orange Show Road Storm Drain Project