Monitoring Scour Critical Bridges (2009) / Chapter Skim
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Pages 76-101
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76 APPENDIX C Summary of Survey Responses The following states submitted surveys. The states that reported the use of fixed scour monitors are in bold.
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77 States that have not replied to date, but that are known to have used or currently have fixed scour monitoring installations include.
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78 2.4 What innovations/advancements would be beneficial for you to consider using fixed scour monitoring instrumentation? AR -- W e are currently undergoing an in-house research project (see attach me nt)
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79 CA (2.1) -- Toomes Creek, 99 CA (2.2)
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81 VT -- 1966 WA -- 1929 3.8–3.9 Who owns/maintains the bridge?
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82 FL -- 120 ft (District 2)
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83 3.15 (Item 60/Item 113)
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84 3.17 What is the foundation type? Piles = 37 Spread Footings = 22 Drilled Shafts = 1 Unknown = 1 Other = 1 3.18 Is the foundation depth known?
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86 HI (1) -- 2/1/04; Q = 930 cfs; 2–5 yr; V = 2 fps IN -- 6/97, 1/99 KS -- 2/25/01 MD -- Hurricane Floyd (1999)
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88 AK (2.12) -- $10,000 materials, $7,000 labor AK (2.13)
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89 FL–D2 -- A co mb ination of inform ation taken fro m the routine inspections, scour evaluations, and the fact that the bridges considered scour critical.
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90 5.9 Do the monitors have an automated alarm system (automatic alert that sends a signal)
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91 IN -- USGS gage about 1 mile downstream of bridge. MD -- The water stage recorder and velocity meters are a part of the scour monitoring contract and are furnished by ETI Instrument Systems, Inc.
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92 6.3 How often is the data collected and reviewed during emergency situations? Every 30 min = 4 Once hourly = 27 Daily = 2 Weekly = 0 Monthly = 0 Other = 23 (Responses include: during a flood, 5 min; every 15 min, twice daily, unknown, bi-weekly, as needed; as often as needed; DOT decision; all data/video are real time; objective is to document the effect of the ice cover on the scour process; ongoing through alarm system and staff; at engineers discretion; every 15 min.)
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93 6.5 How is data downloaded or retrieved? (Check all that apply.)
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94 6.10 How is the data used, and what outputs are generated (i.e., graphs, data reduction, reports, design, and/or analysis)
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95 6.12 What is the scour rating of this bridge according to the FHWA National Bridge Scour Evaluation Program, FRA requirements for identification of scour critical bridges, or other systems? Low Risk = 5 Scour Susceptible = 2 Scour Critical = 39 U nknown Foundations = 2 Others = 22 6.13 Has an emergency Plan of Action, similar to that developed by FHWA, been established?
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96 AR -- Sonar can be checked against portable, boat-m ounted unit. CA -- High stream flows quickly receeded.
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97 7.3 Have any of the following interfered with the operation of or caused damage to the fixed monitors? ( Check all that apply.
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98 7.7 Who repairs the scour monitoring system? Contractor = 24 In-House Staff = 23 Consultant = 7 Monitoring System Vendor = 9 USGS = 25 Other = 8 7.8 Who inspects the scour monitoring system?
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99 HI (1) -- The m onitoring system s were well designed and ma nufactured by ETI.
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100 8.5 Were there any additional problems or issues?
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101 NYCDOT -- Safety assurance during construction of the new bridge TX -- Climbing the learning curve on fixed scour monitoring and evaluation feasibility. WA -- Been able to keep roadway open during rainy season.
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