Shared Flashcard Set

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Erosion & Sediment Control
E&SC facts
50
Civil Engineering
Graduate
03/02/2015

Additional Civil Engineering Flashcards

 


 

Cards

Term
Construction site erosion factors (4):
Definition
-rainfall energy
-soil erodibility
-site topography
-surface cover
Term
NEPA mandates that all federal agencies must complete a(n) ______ or ______ on their activities.
Definition
environmental assessment / environmental impact statement
Term
CWA (1972) classifies sediment releases as ________.
Definition
criminal acts
Term
Construction activities must comply with state regulations and programs addressing ________.
Definition
non-point source pollution
Term
In the CWA, Federal Enforcement is Section ___ and NPDES is Section ___.
Definition
Federal Enforcement: 309
NPDES: 402
Term
MS4 stands for _____________.
Definition
Municipal Separate Stormwater Sewer System
Term
A notice of intent (NoI) includes (4):
Definition
-BMPs
-measurable goals
-implementation schedule
-responsible persons
Term
Non-numeric limitations of the ELG apply to sites greater than or equal to _____.
Definition
1 acre
Term
Principles of NPDES qualifying programs (5):
Definition
1. good site planning
2. minimize soil movement
3. capture sediment
4. good housekeeping
5. mitigation of post-construction SW discharges
Term
State NPDES programs include (4):
Definition
-SWPPPs
-inspections by site operators
-E&SC
-post-construction soil stabilization
Term
General requirements for Construction General Permits (3):
Definition
-NOI
-SWPPP
-NOT
Term
A SWPPP includes (3):
Definition
-potential SW pollution sources -lists and describes E&S controls -operator procedures for CGP compliance
Term
Design objectives of SWPPP (7):
Definition
-stablilize site ASAP
- protect channels & slopes
-reduce impervious surfaces
-control site perimeter
-protect receiving waters
-follow PP measures
-minimize duration & area of exposed soils
Term
ADEM qualifying storm (inches):
Definition
3/4 "
Term
ADEM water quality based effluent limitations: less than ____ below background
Definition
<50NTU below background
Term
ADEM maintenance requirements for major repairs (days):
Definition
5 days
Term
Additional protections applies within ____ feet of a surface water.
Definition
50 feet
Term
E/S control design requirements are for a __yr,__hr storm event
Definition
2yr,24hr
Term
If within 50ft of a surface water, must provide a natural buffer; otherwise achieve an equivalent ____________.
Definition
sediment load reduction
Term
For perimeter controls, sediment must be removed prior to ____ of the above ground height.
Definition
half
Term
ADEM stabilization requirements after earth-disturbing activities cease (days):
Definition
13 days
Term
ADEM vegetative cover density:
EPA vegetative cover density:
Definition
85% / 70%
Term
Sites discharging into Tier 2/2.5/3 waters must stabilize soils within __ days.
Definition
7 days
Term
Sediment basins must be able to store for a _______ storm event.
Definition
2yr 24hr
Term
Site inspections must be once a month or after a qualifying event of ___ inches.
Definition
3/4 in
Term
If substantial work is needed, ADEM requires work completed in _ days.
Definition
5 days
Term
SWPPP modification and corrective action must take place in _ days.
Definition
7 days
Term
NOT is submitted after (3):
Definition
-all earth disturbing activities completed
-uniform perennial veg. cover established
-permanent stabilization measures used
Term
Groups who use SWPPPs (4):
Definition
-owner
-designer
-subcontractors
-inspectors
Term
Records must be retained for ___ years from the termination date.
Definition
3 years
Term
Before starting work (3):
Definition
- submit NOI
- obtain NPDES permit
- make a SWPPP
Term
Hydrological cycle components (5)
Definition
-precipitation
-infiltration
-runoff
-evaporation/transpiration
-GW & stream flow
Term
Typical USGS topo map scale is _:_____
Definition
1:24,000(in:in)
Term
Two main factors affecting peak rate of runoff:
Definition
- duration & intensity of a storm
Term
Storms are described by IDF curves, which stands for:
Definition
intensity, duration, & frequency
Term
Time of concentration (Tc) is time for runoff to travel to a pt of interest from _______.
Definition
the hydraulically most distant point
Term
When channels are straightened, Tc ______.
Definition
decreases
Term
When overland flow is diverted, Tc ______.
Definition
decreases
Term
Design storm duration must equal ___.
Definition
Tc
Term
50% of annual erosion potential in Alabama ranges from __ to __ (inches).
Definition
1.75" to 2.75"
Term
What size storm events are used in E&SC plans?
Definition
2yr, 24hr
Term
Rainfall Distribution Type for most of Alabama (Roman Numeral):
Definition
III
Term
Two types of reaches (WinTR-55):
Definition
channel & storage
Term
Rills are generally less than __ inches deep.
Definition
2"
Term
Different erosion types (6):
Definition
-splash
-sheet flow
-rill
-gully
-stream banks
-shoreline
Term
The most important rain parameter in erosion is:
Definition
kinetic energy
Term
The most important soil parameter in erosion is:
Definition
shear strength
Term
The RUSLE equation can be used to predict rill erosion, but not _________.
Definition
channel scour
Term
K factor is dependent upon (3):
Definition
texture, structure, & permeability
Term
Erosion rate is directly proportional to _____&_____ of cover.
Definition
type & density
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