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From page 39... ... 39 Introduction Case examples were developed from responses to the initial survey, as well as from follow-up interviews conducted with DOT personnel. Follow-up interviews, lasting between 30 and 60 minutes, were conducted via telephone or videoconference. Read the entire page →
From page 40... ... 40 Subsurface Drainage Practices in Pavement Design, Construction, and Maintenance an AASHTO #57 gradation with allowances for minimal amounts of materials passing the No. 200 sieve. Read the entire page →
From page 41... ... Case Examples 41 Source: ALDOT Matls. Read the entire page →
From page 42... ... 42 Subsurface Drainage Practices in Pavement Design, Construction, and Maintenance Sieve Size Percent Passing by Weight #4 #5 #57 2 in. Read the entire page →
From page 43... ... Case Examples 43 installed immediately prior to the placement of the underdrain pipe and aggregate fill material. A maximum of 14 days is allowed between laydown and cover of the geotextile wrap to minimize the potential for damage. Read the entire page →
From page 44... ... 44 Subsurface Drainage Practices in Pavement Design, Construction, and Maintenance drainage systems, and interceptor drains. Subcut drains are used to remove water from subcut sections that are at a high risk of collecting water in bathtubs because of relatively impermeable grades. Read the entire page →
From page 45... ... Case Examples 45 projects, for unbonded PCC overlays with geotextile interlayers, or in areas where the pavement has a history of pumping. A permeable aggregate base (PAB) Read the entire page →
From page 46... ... 46 Subsurface Drainage Practices in Pavement Design, Construction, and Maintenance Source: MnDOT Std. Drwgs 5-297.432. Read the entire page →
From page 47... ... Case Examples 47 Sieve Size Percent Passing by Weight PASB PASSRC 1 ½ in. Read the entire page →
From page 48... ... 48 Subsurface Drainage Practices in Pavement Design, Construction, and Maintenance Source: MnDOT Std. Drwgs. Read the entire page →
From page 49... ... Case Examples 49 Source: MnDOT Std. Read the entire page →
From page 50... ... 50 Subsurface Drainage Practices in Pavement Design, Construction, and Maintenance any geotextile materials. DSB compaction should be conducted using non-vibratory rollers, and no traffic is allowed after final placement and compaction. Read the entire page →
From page 51... ... Case Examples 51 Subsurface Drainage System Testing and Maintenance As previously discussed, MnDOT policy is to use drainage systems only where commitments are made by district staff to regularly inspect and maintain the system components. Quality assurance testing during construction uses a probe mounted on the end of a flexible fiberglass rod with a diameter of 1 nominal pipe size smaller than the drainpipe being inspected. Read the entire page →
From page 52... ... 52 Subsurface Drainage Practices in Pavement Design, Construction, and Maintenance Source: MoDOT Std. Drwgs 605.101, Sheet 1. Read the entire page →
From page 53... ... Source: MoDOT I-49, Sheet 8 Figure 48. MoDOT typical section for daylighted rock base along I-49 project. Read the entire page →
From page 54... ... Source: MoDOT Std. Drwgs. Read the entire page →
From page 55... ... Case Examples 55 Sieve Size Percent Passing by Weight Gradation A Gradation B 1 ½ in. Read the entire page →
From page 56... ... 56 Subsurface Drainage Practices in Pavement Design, Construction, and Maintenance Sieve Size Percent Passing by Weight 1 ½ in. Read the entire page →
From page 57... ... Source: MoDOT Std. Drwgs 605.101, Sheet 1. Read the entire page →
From page 58... ... 58 Subsurface Drainage Practices in Pavement Design, Construction, and Maintenance the pipe wall, or longitudinal sags that allow silt to collect or water to stand in more than half of the pipe depth, repair or replacement of the deficient portions of the outlet and/or longitudinal pipe must be performed at the contractor's expense. Case Example 4: Pennsylvania Department of Transportation Introduction The Pennsylvania Department of Transportation (PennDOT) Read the entire page →
From page 59... ... Case Examples 59 Source: PennDOT 72M. Figure 51. Read the entire page →
From page 60... ... 60 Subsurface Drainage Practices in Pavement Design, Construction, and Maintenance used and an underdrain system with positive subdrainage is constructed, a drainage coefficient of Cd = 1.1 is used. For rehabilitation projects where past pavement performance has indicated substandard drainage performance of the existing pavement and significant drainage improvements are not proposed, a drainage coefficient of Cd = 1.0 is used. Read the entire page →
From page 61... ... Case Examples 61 Duration Frequency 1 year 2 year 5 year 10 year 25 year 50 year 100 year 500 year 5 min C C C C B B B 10 min C C C C C C C 15 min A A A A A C C 30 min A A A A A C C 60 min A A A A A C C 2 hr E E E E E E E 3 hr E E E E E E E 6 hr D D D D D D D 12 hr F F F F F F F 24 hr F F F F F F F F Source: PennDOT 584, Section 7.A.1. Table 13. Read the entire page →
From page 62... ... Source: PennDOT 584, Section 7.A.1. Figure 52. Read the entire page →
From page 63... ... Case Examples 63 Source: PennDOT 13M, Section 10.3. Figure 53. Read the entire page →
From page 64... ... 64 Subsurface Drainage Practices in Pavement Design, Construction, and Maintenance Source: PennDOT 13M, Section 10.3. Figure 54. Read the entire page →
From page 65... ... Case Examples 65 Sieve Size Percent Passing by Weight 1 ½ in. Read the entire page →

From page 39...

... 39 Introduction Case examples were developed from responses to the initial survey, as well as from follow-up interviews conducted with DOT personnel. Follow-up interviews, lasting between 30 and 60 minutes, were conducted via telephone or videoconference.