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1. The contour interval measurement is the - ANSWER vertical distance
between contour lines
2. to find the elevation of a point on the map - ANSWER Find the
numbered index contour line nearest the point.
3. to find the slope - ANSWER take the contour lines to determine
elevation change (rise) and divide by the horizontal distance associated with
the slope being measured ((run) Use scale on drawing)
4. Steep slopes - ANSWER have lines closer together
5. slope percentage - ANSWER (Contour lines(Run)*Contour
interval(Rise))/Drawing scale
6. Gentle slopes - ANSWER have larger spaces between contour lines
,7. a 45 degree slope is - ANSWER 1 horizontal unit to 1 vertical unit
8. Flow is always perpendicular to - ANSWER the contour lines
9. training is - ANSWER one of the most effective tools in the prevention of
pollutants leaving the site
10.Targeted pollutants of existing vegetation - ANSWER sediment,
nutrients, hydrocarbons, turbidity
11.Hydroseed limitation - ANSWER seasonal mixes, seasonal application,
difficult on steep slopes, traffic, winds
12.Mulching limitations - ANSWER not suitable on steep slopes,
concentrated flows, or high wind areas, invasive species mixed in, needs re-
application, traffic
13.Rolled erosion control products limitations - ANSWER traffic hazard, not
good in rocky areas, areas that will be mowed, or high fire areas, blankets
are UV degradable, small animals get caught in material
14.Seeding targeted pollutants - ANSWER sediment, nutrients,
hydrocarbons, pH, turbidity
,15.sediment basin targeted pollutants - ANSWER sediment, trash,
hydrocarbons, turbidity, metals
16.sediment basin limitations - ANSWER require large area, mosquitoes
17.sediment traps targeted pollutants - ANSWER sediment, trash/debris,
hydrocarbons
18.Sediment trap limitations - ANSWER only remove large sediment
particles, may not be placed in flowing streams
19.turbidity curtain limitations - ANSWER not one size fits all, consult local
regs, not good in high flow water
20.diversion limitations - ANSWER downstream flooding, freezing weather,
violation of run off regs, topographic features.
21.swale targeted pollutants - ANSWER sediment, nutrients
22.swale limitations - ANSWER not for large drainage areas, needs lots of
maintenance, not to be used as sed. trap
23.wet ponds targeted pollutants - ANSWER sediment, nutrients, trash,
metals, organics, hydrocarbons, temperature
, 24.Multi purpose basin targeted pollutants - ANSWER sediment, nutrients,
trash, metals, organics, petroleum
Multi purpose basin limitations - ANSWER only remove small portion of
particles suspended in water, require a large area, mosquitoes
permeable surfaces limitations - ANSWER flooding, lower load capacity than
pavement, frequent maintenance, fire access areas.
infiltration pond targeted pollutants - ANSWER nutrients, organics, sediment,
metals, petroleum
Infiltration pond limitations - ANSWER karst areas, cold weather, not suitable
for clay soils
Bioretention limitations - ANSWER not good for cold climates, infiltration
must be well analyzed, vegetation must be considered carefully
vegetative filter strip limitations - ANSWER difficult to maintain sheet flow
(short circuited), maintenance of vegetation, should not receive highly
contaminated runoff, may increase water temp, mosquitoes
dry pond limitations - ANSWER large space required, not a one size fits all
solution, re-suspension of pollutants