CPESC AU Question with Complete
Solutions
shredded mulch doesn't float but breaks down fast
staw bales last 2-3 mo. at most and must be keyed into ground
5% slope weir height of 18", spacing of check dams 30 ft
12% slope 10ft run, heigh of weir in inches 14.5 in.
outfanking cutting around. CPESC or PE designer need proper design to place silt
fencing in concentrated flows, but should also ensure it will not be outflanked
active / passive treatment active=pumps and flocculants or electro-coagulation,
passive=floc logs weirs etc.
, composite samples vs. grab samples composite-mixes of different samples. grap-one
sample
Most plants are useful for erosion control, but some are more desirable than others due to:
adaptability to physical and climatic site conditions
For a given amount of water, which has the more kinetic energy rainfall at 100mm/hr
(more than water running off in rills)
The definition for hydraulic radius is the ratio of a cross-sectional area to the
corresponding wetted perimeter
a factor that can afffect stormwater runoff volume is the hydrolic soil group
when specifying a legume in a seed mixture for revegetation one should specify the
legume inoculation rate
which one of the following sediment basin shapes has the greatest potential for being most
effective in removing suspended particles for a coarse grained soil: a rectangular basin
having a length :width ration = 8:1
Solutions
shredded mulch doesn't float but breaks down fast
staw bales last 2-3 mo. at most and must be keyed into ground
5% slope weir height of 18", spacing of check dams 30 ft
12% slope 10ft run, heigh of weir in inches 14.5 in.
outfanking cutting around. CPESC or PE designer need proper design to place silt
fencing in concentrated flows, but should also ensure it will not be outflanked
active / passive treatment active=pumps and flocculants or electro-coagulation,
passive=floc logs weirs etc.
, composite samples vs. grab samples composite-mixes of different samples. grap-one
sample
Most plants are useful for erosion control, but some are more desirable than others due to:
adaptability to physical and climatic site conditions
For a given amount of water, which has the more kinetic energy rainfall at 100mm/hr
(more than water running off in rills)
The definition for hydraulic radius is the ratio of a cross-sectional area to the
corresponding wetted perimeter
a factor that can afffect stormwater runoff volume is the hydrolic soil group
when specifying a legume in a seed mixture for revegetation one should specify the
legume inoculation rate
which one of the following sediment basin shapes has the greatest potential for being most
effective in removing suspended particles for a coarse grained soil: a rectangular basin
having a length :width ration = 8:1
