Transcription of CHAPTER 850 PHYSICAL STANDARDS - Caltrans
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CHAPTER 850 PHYSICAL STANDARDS - Caltrans
Highway Design Manual 850-1 July 1, 2020 CHAPTER 850 PHYSICAL STANDARDS Topic 851 General Index Introduction This CHAPTER deals with the selection of drainage facility material type and sizes including pipes, pipe liners, pipe linings, drainage inlets and trench drains. Selection of Material and Type The choice of drainage facility material type and size is based on the following factors: (1) PHYSICAL and Structural Factors. Of the many PHYSICAL and structural considerations, some of the most important are: (a) Durability. (b) Headroom. (c) Earth Loads. (d) Bedding Conditions. (e) Conduit Rigidity. (f) Impact. (g) Leak Resistance. (2) Hydraulic Factors. Hydraulic considerations involve: (a) Design Discharge. (b) Shape, slope and cross sectional area of channel. (c) Velocity of approach. (d) Outlet velocity. (e) Total available head. (f) Bedload. (g) Inlet and outlet conditions. (h) Slope. (i) Smoothness of conduit.
Jul 01, 2020 · Suggested values for Manning's Roughness coefficient (n) for design purposes are given in ... Corrugated steel pipe, steel spiral rib pipe and pipe arches are available in the diameters and ... Specifications). Citing Section 5650 of the Fish and Game Code, the Department of Fish and Game (DFG) may restrict the use of bituminous coatings on the ...
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