3.1.5 Drainage Plan Sheets – for culverts, storm sewer and inlets

Refer to the
PS&E QC Milestone Checklist
for information to include on the Drainage Plan Sheets.
Refer to TxDOT’s
Hydraulic Design Manual
for information on drainage design details.
3.1.5.1 Drainage Area Maps
Drainage area maps are drawn at an appropriate scale to include all the drainage areas of the project. The purpose of this sheet is to document the size and location of the watersheds used to size each of the culvert, storm sewer and inlet drainage structures and/or appurtenances
Refer to
DES – Hydrology and Hydraulics Section
 for example drainage area maps.
3.1.5.2 Hydraulic Calculations
Hydraulic calculations for culverts, storm sewer systems and inlets are documented in a runoff computation table and a hydraulic calculation table if those appurtenances are included in the plans. These tables are included on the Hydraulic Calculations Sheets to verify structure design and to document calculations.
Refer to
DES – Hydrology and Hydraulics Section
 for example plan sheets, standard calculation tables for the culvert, storm sewer, and inlet computation that may be used in the plans.
Each bridge classification stream crossing (including bridge class culverts) will have its own Bridge Hydraulic Data Sheets. See
Section 3.1.7.1
for further information on Bridge Hydraulic Data Sheets.
3.1.5.3 Cross Drainage Culvert Layouts
Each cross-drainage culvert included in the proposed work should have a plan and cross section which shows the work to be done, and the description of the culvert. Bridge class culvert layouts should be developed according to TxDOT’s
Bridge Detailing Guide
.
3.1.5.4 Storm Drain Plan and Profile Layouts
When storm drain and inlets are part of the proposed project, plan and profile layouts should be developed to indicate the location, type and construction of the appurtenances.
3.1.5.5 Miscellaneous Drainage Details
Include Miscellaneous Drainage Details for items such as:
  • Inlet modifications;
  • Pipe bedding details;
  • Rebar layout and cross sections for non-standard designs;
  • Support slab layouts;
  • Concrete collar details;
  • RC pipe connections; and
  • Flume or channel details.
3.1.5.6 Drainage Standards
These include standards such as for single and multiple box culverts, wingwalls, headwalls for pipe culverts, safety end treatments, etc. Drainage standard sheets can be found on TxDOT’s
Bridge Standards webpage
.