Refer to chapter three of the bridge design manual for information on drainage design for. Section 5 bridge decks new york state department of. Aashto lrfd bridge design specifications specific to new mexico bridge design practice so that uniformity in bridge design procedures will be attained. The selection and proper application of the component design and any modifications shown.
Hydraulic design frequency and design criteria are based on federal and state laws and regulations, safe operation of the highway facility and impact to adjacent property owners. Quantity and quality of runoff should be maintained as required by applicable stormwater regulations. Specific design practices that can reduce the need for bridge storm drain systems and improve deck drainage performance include. Also decks should be made integral with the abutments to avoid any joints in the carriageway. The bridge design detailing manual guidelines listed below are developed and maintained by the structure design detailing technical committee within the division of engineering services des. In addition, removal of deck drainage prior to the bridge end will reduce water damage attributed to leaky joints and undermining of bridge approaches. Finally, a complete design of the bridge including girders, columns, abutments and the deck was created. The goal is a design that is the most costefficient while still satisfying the criterion described below. Identify if there are bridge or culvert structures upstream or downstream including their configuration and distance from the proposed structure. Revised the minimum width on either side of the restrictor plate.
To address drainage and hydrology considerations in highway design and corridor management, the ministry of transportation. Drainage design manual march 2019 2 illinois tollway widening or lane addition projects. Should the design process indicate a drainage system is needed, utilization of the most hydraulically efficient and. Hydraulic structures are typically designed for high flow events, although specific projects may also have low flow criteria. The section responsible for design of the drainage structure shall also design the related stream bank stabilization and erosion control. The bridge drainage systems covered in this section includes the bridge deck gutter, drainage. A bridge deck gutter is defined in this manual as the section of pavement next to the curb or parapet that conveys water during a storm runoff. To address drainage and hydrology considerations in highway design and corridor management, the ministry of transportation mto has developed a number of documents and tools.
A vital part of a bridge design is the drainage system. Design of bridge deck drainage, hydraulic engineering circular no. Ideally the road alignment should have a continuous fall from one abutment to the other. Bridge deck inlets go to chapter 6 the design of the bridge deck inlet is important because it removes water from a bridge deck within the limits of allowable spread. Care should be taken to maintain these grades during any resurfacing operations. The bridge design engineer shall ensure that this runoff would not cause any erosion near the abutment fill.
Bridge deck drainage shall be allowed to fall freely to the ground through deck scuppers unless otherwise directed by the bridge engineer. The intent is to provide guidance as well as an interpretation of aashto lrfd bridge design specifications specific to new mexico bridge design. You can search the publications of more than 60 of the industrys major publishers. Local pooling of drainage water for extended durations on the bridge deck. Fastflow is produced at our uk foundry and offers effective drainage systems, catering for both surface and subsurface bridge drainage. If bridge geometry is such that drains are required, the number of drains should be minimized as much as possible while still providing a bridge deck drainage design that meets required standards. Where drainage facilities are needed, the preferred design is to capture the runoff with inlets at the ends of the bridge. The primary reason for a good bridge deck drainage design is to provide for safe passage of vehicles during the design storm event.
Weve got the knowhow to help you find the right answers. Hydraulic performance of small scale bridge deck drains. Massdot issues guides and manuals for use by our project designers. The joint gap width will vary where the joint is designed to accommodate thermal and other movements. Design of bridge deck drainage fhwa us department of. If decks cannot be made integral then the fixed abutment should be positioned at the low end to minimise any surface water leakage through the deck. Bridge deck drainage systems are to be designed to accommodate runoff using the design criteria for rainfall intensities and spread of gutter flow set forth in table 1.
Road drainage design has as its basic objective the reduction andor elimination of energy generated by flowing water. Roads will affect the natural surface and subsurface drainage pattern of a watershed or individual hillslope. Bridge deck site for all rainfall events monitored, loop 289, lubbock. The scope of this chapter is limited to the drainage design responsibilities of the project development section. Compare actual location to initial assumption and verify that assumption is. All warranties and representations of any kind with regard to said documents are disclaimed, including the implied warranties of merchantability and fitness for a particular use. Surface and subsurface bridge deck drainage solutions the only typei d400 bridge drainage product. The drainage design manual dated march 2019 replaces the previous version dated march 2018. Added statement indicating existing cmp pipes shall be replaced. Characterization of stormwater runoff from a bridge deck.
Updates and additions to the manual will be on an as needed basis. Four inch diameter scuppers spaced on five foot center maximum shall provide deck drainage for a normal crowned section with eight to ten foot shoulders. Many short, singlespan bridges do not require drainage facilities. A fraction of this pollution is conveyed to receiving waters by stormwater drainage from highways. Composite design provides an advantage in reducing the necessary section of primary members and also serves to. The following is the bridge deck drainage document referred to in the manual bdm. Bridge deck drainage roadway and bridge deck profiles shall be adjusted as much as possible to avoid having bridge drains on the bridge. In considering a costefficient drainage design, the initial cost should be considered, but facility longevity and future maintenance costs and legal and environmental constraints should. Technical details of the assessment process are included in the appendix. Best practices do not override design frequency and allowable spread criteria. Bridge construction standards bridge drainage author. Hambly covers methods of analysis of various types of bridge decks.
Identify existing drainage problems of other bridge structures upstream or downstream. For example, inlets for a reinforced concrete bridge deck must fit within the reinforcingbars layout. Such design ideas as making it a onespan bridge and what material to use in construction, prestressed concrete or steel, were further investigated. The design criteria in this document shall be used for the new or reconstructed portions of facilities. Proper drainage increases safety and prolongs the lifetime of the bridge. Federal highway administration, urban drainage design manual. Identify impact of the other structures on the design criteria for the crossing being considered. The design of drainage structures is based on the sciences of hydrology and hydraulicsthe former deals with the occurrence and form of water in the natural environment precipitation, streamflow, soil moisture, etc. Composite design provides an advantage in reducing the necessary section of primary members and also serves to significantly stiff en the bridge. Bridge design details 116, use of bridge standard details xs. Chapter 15 structural design requirements for designbuild. New bridge design information is continually developing. Virginia department of transportation, drainage manual, april 2002. Drainage design of existing facilities shall not be modified unless a flooding problem is identified or if the existing design is incompatible.
Bridge design bridge design books for bs 5400 and eurocodes. In considering a costefficient drainage design, the initial cost should be considered, but facility longevity and future maintenance costs and legal and environmental constraints should be considered also. This means that our units have been proven to withstand the d400 load test without the need for concrete haunching to achieve structural strength. The washington state department of transportation wsdot makes these documents available on an as is basis. The manual also stresses the advantages of designing to minimize the complexity of bridge deck drainage systems. Bridge standard detail sheets change transmittal pdf summary of revisions pdf support. When deck drainage interceptors are needed, a storm sewer collection system will be necessary to discharge. As spread of water from the curb increases, the risks of traffic accidents and delays, and the nuisance and possible hazard to pedestrian traffic increases. Revised reference to the tollway drainage design manual from section 10. Some highway runoff is treated by structural or nonstructural systems best management practices.
If decks cannot be made integral then the fixed abutment should be positioned at the low end to minimise any surface. Produced in any size to suit your design and compliant at point of purchase 100% recyclable. Scuppers are the recommended method of deck drainage because they can reduce the problems of. Added load rating is required when a new feature is added to a bridge that increases or redistributes the existing permanent loads on a bridge. Any size and type can be produced with any combination of width, depth, upstand and profile. Characterization of stormwater runoff from a bridge deck and. Likewise, where catch basins are used, the outlet from the basins shall be designed to properly discharge to the wash. Where it is necessary to intercept deck drainage at intermediate points along the bridge, the design of interceptors shall conform to hec21 procedures. This manual is intended to provide general guidance, and not solutions that are specific to any project.
The current practice for bridge deck drainage assessment is formally accepted as the departments best practice. From a hydraulic point of view, inlets should be large and widely separated. Deck drainage impacts are to be considered at the bridge conceptual design. Secondly, it is to minimize the amount of flow over the joints at the ends of the bridge. Fastflow bridge deck drainage systems expansion joints. Envirodeck and envirobridge are simple and effective bridge drainage systems with advantages both during construction and throughout the lifetime of the bridge. Fastflow bridge deck drainage provides a complete drainage solution for both bridges and standard. Appendix e bridge deck drainage calculations appendix f mot drainage calculations appendix g cost calculations appendix h correspondence and report excerpts such as existing bridge plans, bridge inspection reports, flood insurance study, original fema model, hydrology and hydraulic reports from other sources.
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