under NYC code rules a plumbing stack draining 550 sanitary

under NYC code rules, a plumbing stack draining 550 sanitary fixture units must be sized at a minimum of
a. 2\"
b. 3\"
c.4\"
d.5\"

a 4\" horizontal storm drain pitched at 1/2\" per foot can carry how many equivalent square feet of roof area by NYC code
a. 1500
b. 2120
c. 3000
d. 5320

Solution

Under NYC rules-

a) A plumbing stack draining 550 sanitary fixture must be sized at minimum of 4\'\'. Hence option c.

b) b = 2120