Culvert and Pipe Phasing
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1 Culvert and Pipe Phasing Barney Blackburn, PE, CPESC, CPSWQ NCDOT Roadside Environmental Unit Soil & Water Engineering Section Supervisor NCDOT Culvert Phasing Process Hydraulics Unit: Culvert Survey Report (CSR) Permit Drawings and Impact Summary Hydraulics and Roadside Environmental Units: Develop Culvert Construction Sequence Roadside Environmental Unit: Include Culvert Construction Sequence in Erosion Control Plans 1
2 Components of Culvert Phasings Stilling Basin or Silt Bag Impervious Dike Temporary Pipe Temporary Channel Change Stilling Basin Design Volume (ft 3 ) = Width of Stream Channel (ft.) x (Length of Culvert (ft.) + 20 ft. (10 ft. on Each Side)) x Depth of Water in Stream (ft.) Typically used for Volumes > 100 CY (2700 ft 3 ) Freeboard = 6 inches (Minimum) Design Permeable Stone Drain to Dewater at a Slow Rate Add Volume to Required Volume of Sediment Basins 2
3 Stilling Basin Volume Design Formula for Stilling Basin Volume: d = 3 5 ft. Side Slope = 1.5:1 + W base L base x 1 ft. 3
4 Stilling & Sediment Basin Design Example of Stilling Basin as Sediment Basin: Required Volume for Sediment Basin = 1800 ft 3 Required Volume for Stilling Basin = 1500 ft 3 Provided Volume of Sediment Basin = 2820 ft 3 Additional Volume Needed for Sediment Basin = = 480 ft 3 Stilling Basin Placement Inside Perimeter EC Devices Level Ground Locate to Avoid Pumping Across Stream Avoid Placing in Locations of Sediment Basins 4
5 Stilling Basin Construction Construct Above Ground with Length:Width Ratio of 2:1 Install 3 Coir Fiber Baffles Excavate 1 ft. Below Ground for Permanent Pool Stabilize Interior and Exterior Slopes Use Small Grade Stone (NCDOT Class A & B, No. 57) Stilling Basin 5
6 Stilling Basin with Geotextile Liner Stilling Basin with Flashboard Riser 6
7 Flashboard Riser Silt Bag Design & Placement Maximum Pumping Rate of 80 gal/min/sf Typically, Volumes less than 100 CY (2700 ft 3 ) Place Inside Perimeter EC Devices Place on Level Ground Locate to Avoid Pumping Across Stream 7
8 Silt Bag Installation Install Geotextile (NCDOT Type 2) under Bag Place No. 57 Stone or Wood Pallets under Bag Always Keep Extra Bag(s) Onsite! Flocculants and Polymers will Clog Pores of Bag 8
9 Silt Bag Impervious Dike Dike Types: Sand Bags Sheet Piling Stone with Polypropylene Used in Stream Channel at Upstream and Downstream of Site Used to Anchor Temporary Pipes Used to Create Side of Temporary Channel 9
10 Sand Bags Sheet Piles 10
11 Stone with Geotextile Temporary Pipe Design & Construction Design to Average Daily Flow (ADF) Common Sizes: 15, 18 and 24 Anchor Ends with Impervious Dikes Used Primarily for Culvert Extensions 11
12 Temporary Pipe Temporary Channel Design Design to Carry Average Daily Flow (ADF) Use Maximum of 2:1 Side Slopes Design as Base Ditch Don t Design in Areas of Existing Fill Slopes! 12
13 Temporary Channel Construction Line with Geotextile (NCDOT Type 4) Protect Top of Channel with: Berms Silt Fence Impervious Dike Berm at Top of Temporary Diversion 13
14 Silt Fence with Temporary Diversion Types of Culvert Phasings Pump and Dike Dike Only Dike and Pipe Dike and Temporary Channel 14
15 Phasing Per BMP Manual Note 15
16 Pump and Dike Short Duration Process (Max. 5 days!) Use for Pipe Installation Include Pump Around Detail in the Plans Reference BMP Manual with Note 16
17 Impervious Dike Phasing Short Duration Process Use for Pipe Installation/Culvert Extension Include Dewatering Details in Phasing Do not Block Channel with Dike! 17
18 Culvert Extension with Dike Culvert Extension with Dike 18
19 Temporary Pipe Phasing Use for Pipe Installation/Culvert Extension Can be Utilized for New Culverts Include Dewatering Details in Phasing Anchor Pipe(s) with Impervious Dike Phasing with Pipe and Dike 19
20 20
21 Phasing with Temporary Channel Include Permit Impacts for Channel Tie Ins Design/Build with Room to Install Wing Walls Include Channel Dimensions: Base Width Channel Depth Side Slope Info 21
22 Phasing with Temporary Channel Impervious Dike with Channel 22
23 Temporary Stream Crossing Design & Construction Design to Carry 2 yr Storm More than One Pipe can be Used Install Geotextile (Type 2) under Pipe(s) and Stone Use Class B and No. 57 Stone 23
24 Stream Crossing at Diversion Stabilization for Culverts Seed and Mat in Timely Manner Mat Slopes (Straw, Excelsior, Permanent) Place Coir Fiber Mat on Stream Banks at Inlet Protect Seeded Area with Temporary EC Devices 24
25 Stabilized Slopes Enhancements for Stilling Basins Coir Fiber Baffles Pumping Water from Top of Basin Water Permanent Pool Flocculants 25
26 Flocculant Incorporation Flocculant Incorporation 26
27 Considerations for Culvert Phasing Develop in Conjunction with EC Plan Culvert Phasing a Recommendation and Dependent on: Contractor Site Conditions Include Details in Construction Sequence NCDOT Web Site Links REU Soil & Water Engineering Section NCDOT BMP Manual NCDOT Hydraulics Unit 27
28 Questions? 28
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