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.
Jul 01, 2020 · reinforced concrete pipe can be affected by abrasive flows or acids, chlorides and sulfate in ... in these environments without coating or the need to provide extra cover over reinforcement. (5) Direct Design Method ... on a high skew. This situation will require either a longer culvert than otherwise may have
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