Site Work DD

Question 1

runoff

Answer 1

stormwater that accumulates on site in excess of what can be absorbed by ground

Question 2

above ground drainage system

Answer 2

porous paving, sheet flows, gutters, swales, channels

Question 3

underground drainage system

Answer 3

drains, enclosed storm sewers to carry runoff off site

Question 4

capacity of drainage system

Answer 4

based on size of area, runoff coefficient (fraction of water not absorbed)

Question 5

minimum slope of sewer pipe

Answer 5

0.5%-2%, depends on size of pipe

Question 6

road slope

Answer 6

10%

Question 7

crown

Answer 7

gradual cross slope on road for runoff

Question 8

typical lane road dimension

Answer 8

12’w

Question 9

typical double road dimension

Answer 9

24’w

Question 10

typical radius of cul de sac

Answer 10

40’r

Question 11

pedestrian circulation walkway dimension & rules of thumb

Answer 11

5’ MIN, 6’-8’ better
provide lighting
don’t make cross busy roads
8% max slope, 6% is beter

Question 12

typical slope of parking lot

Answer 12

1.5%-2%

Question 13

ideal pitch away from building

Answer 13

2%

Question 14

recreation area slope

Answer 14

3% max

Question 15

building site slope

Answer 15

10%MAX, 4% preferred

Question 16

ramp max slope

Answer 16

8%, 1:12

Question 17

slope of site to be planted with grass

Answer 17

less than 25%

Question 18

slope of site that must be terraced

Answer 18

25%-50%