I. DESIGN DATAA. BRIDGE SITE TOPOGRAPHIC MAP Drawn to scale of 1:500 to 1:1000 depending on the width of the river The topographic map should be extended at least 200m upstream and downstream from the centerline of the proposed bridge Location plan showing the existing public and private structures/ utilities that maybe affected by the project. Cross-section at the approaches at 20m interval B. PROFILE ALONG THE CENTERLINE OF THE PROPOSED BRIDGE Showing the elevations of ordinary water level (OWL) and maximum flood level (MFL)C. RIVER CROSS-SECTIONS @ 50m interval 100 to 200 meters upstream and downstream from the proposed bridge indicating the experienced high and ordinary water elevations.D. HYDRAULIS / HYDROLOGIC ANALYSIS Topographic map showing the watershed area and the point of interest Calculation of required waterway opening Scour Analysis Calculation of Design Flood LevelE. BORING DATA WITH SPT and GEOTECHNICAL REPORT Minimum of two deep borings shall be made at each abutment and preferably an additional boring at each pier for multi-span bridges. Boreholes shall have minimum depth of 20 meters below the riverbed in ordinary soil or at least 3.0m in bedrock. Standard Penetration Test at maximum interval of 1.50 m and at every change in soil stratum. Analysis for liquefaction potential. The subsurface exploration should define the following, where applicable: Soil Strata Depth, thickness and variability Identification and classification Relevant engineering properties (i.e., shear strength, unit weight, compressibility, stiffness, permeability, expansion or collapse potential) N-values

Rock Strata Depth of rock Identification and classification Quality (i.e., soundness, hardness, jointing, resistance to weathering if exposed, and solution) Compressive strength (eg., uniaxial compression, point load index) Expansion potentialGround water elevation II. DESIGN CRITERIA & STANDARDSA. DESIGN SPECIFICATIONS AASHTO Standard Specifications for Highway Bridges, 17th Edition, 2002 Department Order No. 75, Series of 1992, re: DPWH Advisory for Seismic Design of Bridges. DPWH Design Guidelines, Criteria and Standards, Volumes 1 & 2 (currently being updated) DPWH Standard Specifications, Vol. II, Highways, Bridges & Airports, 2004 ed.B. LOADING SPECIFICATIONS1. DEAD LOAD Selfweight plus allowance for future superimposed dead loads such as wearing surface and weight of public utilities.2. LIVE LOAD Six Classes of Highway Loadings : (Standard Designations)New AASHTO designationsEquivalent Old AASHTO Designations

M 13.5H 15-44

M 18H 20-44

M22.5

MS 13.5HS 15-44

MS 18HS 20-44

MS 22.5

3. IMPACT Impact , I = 15.24 / ( L + 38)

where : I = impact fraction (maximum of 30%) L = span length in meters

4. SIDEWALK LOADING For spans up to 7.92 m .4070 Pa For spans 7.92 to 30.5 m...2870 Pa For spans > 30.5 m ..p = [ 1435 + 43800 / L ] [ (1.67 - W) / 15.2 ] PaWhere: L = span length, m W = sidewalk width, m5. WIND LOAD Superstructure Design

a. For trusses and arches : 3.59 kPa b. For girders and beams : 2.39 kPa Based on 160 km per hour wind velocity. Substructure Design

a. Force transmitted to the substructure by the superstructure plus the forces applied directly to the substructure by wind load : WL SUBSTRUCTURE = 1.92 kPa ( 40 psf )6. THERMAL FORCE a. Provisions shall be made for stresses or movements resulting from variation in temp.b. Under local condition the range of temperature rise and fall could be taken as : + 12.5 oC

II. DESIGN CRITERIA & STANDARDSA. VERTICAL CLEARANCES1. Navigable rivera. At least 3.75 meters from the design flood level (DFL) 2.Hydraulic a. At least 1.50 meters for streams carrying debris b. At least 1.00 meters for others 3.Highway/Underpass/Tunnel a. At least 4.88 meters

B. GEOMETRICS

1. Bridge Alignment

a. Normal bridge A transverse structure perpendicular to the bank of the river or creek. b. Skew bridge A transverse structure having an angle of less than 900 from the bank of the river creek. c. Curved bridge When the structure or portion of the structure is within and following the horizontal curve alignment of the road.

2. Span Arrangement

a. Odd number of spans shall be preferably used to avoid a pier at the center of river or creek.3. Determination of Bridge Length (see Fig. 3-1)a. Sketch the proposed slopes of the grouted riprap following the slope of the banks as close as possible (1:1 for cut, 1-1/2:1 for fill). b. Determine the top of roadway elevation based on the maximum flood water level, freeboard and depth of girders. c. The intersections of the slopes of grouted riprap and the top of the roadway elevation represent the length of bridge required.

4. Recommended Minimum Lane Width and Number of Girders

C. TYPES / CLASSIFICATION OF BRIDGE SUPERSTRUCTURES

1. According to Materials Used

a. Timber Bridge b. Concrete Bridge Reinforced Concrete Prestressed Concrete

c. Steel Bridge Steel Plate Girder Steel I-Beam Steel Truss Steel Box Girder 2. According to Usage

a. Temporary a bridge designed for a short life span b. Permanent a bridge with a designed life span of at least fifty (50) years before it is completely replaced 3. According to System of Designa. Simple Spans b. Continuous Spans c. Cantilever Span d. Suspension Bridge e. Cabled Stayed

4. Recommended Limits of Span of Different Superstructure in the Philippines

a. Timber Trestle Bridge For span not more than 6.00 meters b. Concrete Bridge Reinforced Concrete Precast Slab or Reinforced Flat Slab - span from 6.00m to 12.00m. Reinforced Concrete Deck Girder (RCDG) span from 8.00m to 24.00m. Reinforced Concrete Box Girder span from 22.00m to 30.00m. Reinforced Concrete Hollow Slab Bridge span from 10.0m to 20.0m.c. Prestressed Concrete Bridge

Channel Beams span from 11.00m to 14.0m. Tee Beams span from 15.00m to 18.00m. I-Beams span from 15.00m to 45.00m. Box Girders span over 30.00md. Steel Bridges Steel I-Beam span from 15.00 to 30.00m. Steel Plate Girder span from 20.00m to 50.00m. Steel Box Girder span from 30.0m to 100m. Bailey Bridge span from 9.00m. to 30.00m. Steel Truss span from 40.00m to130.00m. e. Suspension Bridge span from 70.00m and over. f. Cable Stayed Bridge For span from 70.00m and over.