In U.S. customary units, the Rational Method peak-runoff equation used in ASCE urban stormwater design is Q = CiA. What do C, i, and A represent?
Stormwater Management
Question · Easy
How deep before you need a trench box?
Short
A 4.0-acre paved industrial pad has a runoff coefficient of 0.90. For a design intensity of 3.5 inches per hour, what is the Rational Method peak discharge?
Question · Medium
On a flood-control project, what is the primary functional difference between a detention basin and a retention basin?
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Time of concentration for a Rational Method design is best defined as the time required for:
All else equal, which land-cover change most increases the Rational Method runoff coefficient C?
The longest way home
In urban stormwater quality practice, the "first flush" refers to:
Under the EPA Construction General Permit framework used in New Mexico, a Stormwater Pollution Prevention Plan (SWPPP) is required when construction disturbs:
A combination curb-and-grate inlet is selected at a sag on an urban street. What is the principal hydraulic reason for using both openings together?
For the same diameter and slope, why does a corrugated metal pipe (CMP) carry less discharge than a smooth concrete pipe when both flow full?
Never enter a tank before testing the air
A long concrete box culvert under a fill is flowing full with a high tailwater. Which statement correctly describes the hydraulic control?
Question · Hard
Why is the Rational Method generally not used by itself to size a detention pond?
During excavation of a storm-sewer trench beside a paved street, which construction BMP is the most direct control for keeping sediment out of an existing curb inlet?
On a newly graded basin side slope, runoff that moves as a thin film without a defined channel is called:
A dry extended-detention pond on a GF-4 flood-control site is designed so that the post-development 10-year peak leaving the outlet is no greater than the pre-development 10-year peak. What is the contractor's most important construction implication?
Under OSHA 29 CFR 1926.652, a protective system is required for a trench that is 5 feet deep or greater unless:
Osha Safety
OSHA 1926.651(c)(2) requires a stairway, ladder, ramp, or other safe means of egress in a trench that is 4 feet deep or more so that no employee has more than how much lateral travel to the egress?
Unless a retaining device is used, excavated spoil and equipment that could fall or roll into an excavation must be kept at least how far from the edge?
Who must inspect a storm-sewer trench, the adjacent area, and the protective system before the shift starts and after a rainstorm?
For a simple slope excavation less than 20 feet deep in Type C soil, OSHA Subpart P Appendix B allows a maximum slope of:
A cohesive soil has an unconfined compressive strength of 1.8 tsf, but it was previously excavated and recompacted last year. How must a competent person classify it for OSHA sloping?
A 22-foot-deep excavation for a concrete outlet structure will be sloped or shored. What additional OSHA requirement applies at this depth?
Before employees enter a 5-foot-deep storm-sewer manhole excavation where a hazardous atmosphere could reasonably be expected, OSHA 1926.651(g) requires testing. Oxygen is acceptable when it is at least:
In trench and excavation work, the leading cause of death that Subpart P protective systems are written to prevent is:
Free water is seeping from the face of a 7-foot storm-drain trench in otherwise firm silty clay. What is the correct OSHA implication?
Match the OSHA unconfined compressive strength ranges to soil type for cohesive soils.
On a construction schedule, the critical path is the sequence of activities that:
Project Management
A superintendent finds that the plan invert of a box culvert conflicts with an existing 8-inch water main. The correct first contract communication is:
Total float on a noncritical activity is best described as the amount of time the activity may be delayed:
Liquidated damages in a public drainage contract are best understood as:
A superintendent's daily report on a GF-4 job should, at minimum, record:
A hydraulic excavator with a 2.0 loose-cubic-yard bucket operates at 80 percent bucket fill, 90 seconds per cycle, and 50 productive minutes per hour. What is the approximate production in loose cubic yards per hour?
Shop drawings for a precast box culvert are submitted so that the engineer can:
On a public drainage contract that includes a SWPPP, the contractor's project-management duty is to:
A channel excavation is estimated at 8,000 bank cubic yards (BCY). The soil has 25 percent swell. How many loose cubic yards (LCY) should be planned for haul?
The invert (flowline) elevation of a storm sewer or culvert is the elevation of:
Surveying Layout
A project benchmark is:
Station 12+50 on a drainage alignment is how many feet from station 10+00?
A grade stake at a basin bottom reads "C 2.4." Existing ground is above the design grade. What should the grader do?
Slope stakes on a channel or embankment are set to mark:
A 24-inch storm drain has invert 5,248.50 feet at station 10+00 and invert 5,246.10 feet at station 12+00. What is the pipe slope?
After a flood-control basin is built, as-built (record) drawings should show:
Under New Mexico 811 and NMSA 1978 Chapter 62, Article 14, an excavator must give advance notice of at least:
New Mexico One Call
New Mexico 811 requires excavators to keep the cutting edge of mechanical equipment, including mechanical boring, at least how far from the marked edge of an underground facility until the line is exposed by hand or vacuum?
Under the APWA Uniform Color Code used in New Mexico, white markings indicate:
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