Bridge Hydraulics Practice Flashcards

This flashcard set covers the fundamental definitions, survey requirements, hydrologic and hydraulic analysis formulas, and protection methods for bridge hydraulics.

From a hydraulic perspective, a bridge is part of a stream crossing system that includes the approach roadway across the floodplain and any __________.

openings

For a topographic/hydrographic survey of a new bridge, the limit of the profile is a minimum of 500m or __________ times the width of the channel, whichever is larger.

5

When surveying for a new bridge, a minimum of five cross sections should be taken at a distance of __________ meters upstream and downstream.

20

The borehole log for BH-01 (Abutment A) at the DRT-San Jose Bypass Road project indicates an end depth of __________ meters.

40

The most commonly used formula for determining the time of concentration ($t_c$) is the __________ Formula.

Kirpich

In the Kirpich formula for $t_c$, the variable $H$ represents the __________ from the highest to lowest elevation of the river.

difference in elevation

The Rational Formula for discharge is identified as $Q = \frac{CIA}{3.6}$, where the variable $I$ is the __________.

rainfall intensity

The Rational Formula for hydrologic analysis is used if the catchment area is less than __________ $km^2$.

20

Hydraulic considerations for bridge planning and design involving water levels, velocities, and scour often utilize the software __________.

HEC-RAS

Local pier scour is primarily caused by __________ and wake vortices around a cylindrical element.

horseshoe

The vertical clearance between the Design Flood Level ($DFL$) and the lowest member of the bridge superstructure must be at least __________ meters for rivers carrying debris.

1.50

For navigable channels, vertical clearance is calculated using the formula $HWL + HV + K$, where $K$ is a constant allowance of __________ meter(s).

1

The height of the water level in the river under normal conditions is termed the __________ (OWL/NWL).

Ordinary Water Level or Normal Water Level

According to Design Flood Frequencies (Table 3.2.5-1), a National Road bridge requires a Design Flood frequency of __________ years.

50

For both Expressways and National Roads, the Check Flood frequency for hydraulic scour is __________ years.

500

Types of bridge pier protection include loose boulder aprons, articulated blocks, and __________.

gabions and mattresses

Common methods for bridge abutment protection include boulder riprap, gabions, reinforced concrete, and __________ riprap.

grouted