CISEC EXAMS SCRIPT ALL QUESTIONS AND
ANSWERS SURE A+
✔✔What factors impact rainfall erosion? - ✔✔-Climate events
-Soil erodibility
-The length of flow over a distance/ How Far
-Rate of flow
-The angle of the slope
-Vegetative cover
-Erosion and Sediment controls (BMPs)
✔✔What is Sediment? - ✔✔The eroded material that settles in water or air.
✔✔What is sedimentation? - ✔✔The process by which eroded soil particles in water or
air are deposited in NEW locations.
✔✔Rate soils from Most Erodible to Least. - ✔✔1. Silt = big particle/more erodible
k~0.57
2. Sand/Loam = medium
3. Clay = very small particles/least erodible k~0.10
✔✔Which direction does water flow? - ✔✔High points to low.
Through the mouth of the "V" from the back- up.
✔✔Basin divides - ✔✔Separates flows
-water that goes from low point to high. To extend the time of concentration
✔✔What is a hydrograph? - ✔✔a "picture" of runoff
x-axis = time in minutes
y-axis = flow in cubic ft/sec
, The volume of runoff is everything under the curve (somewhat bell-shaped) - similar to a
sedigraph
Sedimentation occurs at tail-end when flows are decreasing
✔✔Flocculants - ✔✔chemicals added to a mixture to make suspended particles clump
together
created larger particles that fall rapidly
method for reducing turbidity
Types of flocculants:
Cationic = dangerous for fish/can suffocate
Anionic = ok for fish
✔✔Who decides the necessary BMPs in a SWPPP/for a project? - ✔✔The
DEVELOPER (not inspector)
✔✔ Types of Sediment Control BMPs - ✔✔- silt fences
- vehicle tracking pads
- SCS (sediment containment systems) / Filter Bags
- inlet barriers in front of "sump" D.I. or rocks around an Area Drain
- fiber rolls
- compost berms / compost socks
- bale / straw bale barriers
- rock check structure / riprap
- filter bags
✔✔Types of Erosion Control BMPs - ✔✔- placement of pavement
- installing landscaping materials
- establishing vegetation (native) / seeding
- contrustion of homes
- culverts/slope drains
- diversion channels
- ECB and TRMs
✔✔Types of Wind Erosion Control BMPs - ✔✔- Fences w/ slats or openings
- Vegetative strips / Establishing Vegetation
- Soil roughening
- Liquid applications (water or chemical soil binders)
✔✔What is the minimum number of required inspections? - ✔✔Once every 14 days.
ANSWERS SURE A+
✔✔What factors impact rainfall erosion? - ✔✔-Climate events
-Soil erodibility
-The length of flow over a distance/ How Far
-Rate of flow
-The angle of the slope
-Vegetative cover
-Erosion and Sediment controls (BMPs)
✔✔What is Sediment? - ✔✔The eroded material that settles in water or air.
✔✔What is sedimentation? - ✔✔The process by which eroded soil particles in water or
air are deposited in NEW locations.
✔✔Rate soils from Most Erodible to Least. - ✔✔1. Silt = big particle/more erodible
k~0.57
2. Sand/Loam = medium
3. Clay = very small particles/least erodible k~0.10
✔✔Which direction does water flow? - ✔✔High points to low.
Through the mouth of the "V" from the back- up.
✔✔Basin divides - ✔✔Separates flows
-water that goes from low point to high. To extend the time of concentration
✔✔What is a hydrograph? - ✔✔a "picture" of runoff
x-axis = time in minutes
y-axis = flow in cubic ft/sec
, The volume of runoff is everything under the curve (somewhat bell-shaped) - similar to a
sedigraph
Sedimentation occurs at tail-end when flows are decreasing
✔✔Flocculants - ✔✔chemicals added to a mixture to make suspended particles clump
together
created larger particles that fall rapidly
method for reducing turbidity
Types of flocculants:
Cationic = dangerous for fish/can suffocate
Anionic = ok for fish
✔✔Who decides the necessary BMPs in a SWPPP/for a project? - ✔✔The
DEVELOPER (not inspector)
✔✔ Types of Sediment Control BMPs - ✔✔- silt fences
- vehicle tracking pads
- SCS (sediment containment systems) / Filter Bags
- inlet barriers in front of "sump" D.I. or rocks around an Area Drain
- fiber rolls
- compost berms / compost socks
- bale / straw bale barriers
- rock check structure / riprap
- filter bags
✔✔Types of Erosion Control BMPs - ✔✔- placement of pavement
- installing landscaping materials
- establishing vegetation (native) / seeding
- contrustion of homes
- culverts/slope drains
- diversion channels
- ECB and TRMs
✔✔Types of Wind Erosion Control BMPs - ✔✔- Fences w/ slats or openings
- Vegetative strips / Establishing Vegetation
- Soil roughening
- Liquid applications (water or chemical soil binders)
✔✔What is the minimum number of required inspections? - ✔✔Once every 14 days.
