Single span portal culvert

Hi, I have designed the single span portal culvert as per AASHTO 17th Edition and used for some of the project. Please send your comments if any and help me to prepare better calculation report. Thanks Mangesh.

DESIGN CALCULATION FOR PORTAL CULVERT                            
1.0 GENERAL  
 1.0 Introduction      
 1.1 Scope:      
 1.2 Codes & Referances:      
The latest edition of the following codes and standards have been used for the design.
BS 4449 Carbon Steel Bars for the Reinforcement of Concrete
BS 4483 Steel Fabric for the Reinforcement of Concrete
BS 8004 Code of practice for foundations
BS 8110 Structural use of concrete - Code of practice for design and construction
2.0 DESIGN DATA  
 2.1 BUILDING DESCRIPTION 
 2.2 SITE LOCATION 
 2.3 MATERIAL PROPERTIES 
 2.4 SOIL CONDITION 
 2.5 DESIGN LOAD 
3.0 DESIGN CALCULATIONS  

Calculation Reference

AASHTO

Reinforced Beam Design

Concrete Designer