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Land Use, Natural Storage, Vegetative Cover, and Soil Property Information. Description of the Drainage Features of the Watershed. Rainfall Observations and Statistics of the Precipitation. Streamflow Observations and Statistics of the Streamflow.
TxDOT uses the drainage practices and design standards described in this manual for designing drainage facilities and flood control works associated with transportation projects. They are also used for evaluating the design, construction, and performance of projects in TxDOT’s right-of-way.
Overview. This section discusses project elements typically designed by the drainage engineer. Tasks fall into categories of hydraulic design, drainage details, and storm water pollution prevention plan preparation. Drainage design requires continuous coordination with roadway design activities.
Non-Freeway Rehabilitation (3R) Design Criteria 1. Purpose. ♦ Overview; ♦ Design Guidelines 2. Design Characteristics. ♦ Pavement Design; ♦ Geometric Design; ♦ Design Values; ♦ Alignment; ♦ Design Speed; ♦ Side and Backslopes; ♦ Lane Widths 3. Designing for Safety. ♦ Overview; ♦ Safety Design; ♦ Basic Safety Improvements ...
The designer should examine the source of the flooding to make sure the project will not trap flood waters or block drainage. The design may require relief structures in any elevated roadway or extended bridge approaches.
This chapter describes the hydraulic aspects of culvert design, construction and operation of culverts, and makes references to structural aspects only as they are related to the hydraulic design.
Description of the Drainage Features of the Watershed. Channels, ponds, reservoirs, culverts, and other natural or constructed drainage features in a watershed affect the runoff from the watershed. Thus data that describe those must be collected.
The locations and sizes of proposed cross-drainage structures (bridges and culverts) must be determined early in the preliminary design phase because of their potential to affect the roadway profile and other elements of the preliminary design of the project.
Typically, TxDOT requires the designer to: Select an appropriate frequency for the event that will be the basis for design or evaluation, considering the risk of capacity exceedance. The event selected may range from one with a 50% AEP (2-year event) to one with a 1% AEP (100-year event).
This manual identifies those policies, standard practices, criteria, guidance and references approved for use in carrying out the hydraulic design responsibilities in TxDOT. In this regard, the following definitions will be used: Anchor: #PEMIMENH.