Deck 12: Storm Sewer Design

Question 1

A useful topographic map can be prepared by a combination of aerial and ground surveys.

Answer 1

True

Question 2

The three principal components of a storm sewer system are the ____________________, the pipe, and the outflow headwall.

Answer 2

inlet

Question 3

The headwall conveys stormwater toward a receiving stream.

Answer 3

False

Question 4

Inlets or manholes must be placed at each point where the ____________________ or size of the pipe changes.

Question 5

What is the most fundamental element of a storm sewer design?

A)choosing a pipe with sufficient size and grade
B)calculating the velocity of flow
C)calculating slope
D)choosing metal pipe

Question 6

An energy dissipator can be used to ____.

A)collect water for temporary storage
B)increase water velocity exiting a sewer outfall
C)get the water directly from the outfall to the stream
D)control erosion at a storm sewer outfall

Question 7

____________________ is a lining of heavy rocks covering the vulnerable ground to protect the ground surface and slow the discharging velocity at the same time.

Question 8

Type of pipe material has no bearing on pipe capacity.

Question 9

The principal goal of hydraulic design is to determine ____.

A)pipe size
C)site layout
B)discharge
D)the design storm

Question 10

The purpose of a(n) ____________________ is to protect the soil around the discharge pipe from erosion and keep the slope in place.

Question 11

If a channel exists downstream of the outlet, the riprap width is dictated by the ____________________ of the channel.

Question 12

Which is the first step in a storm sewer design investigation?

A)project meeting
B)topographic map
C)site reconnaissance
D)local land development ordinance

Question 13

Discharge exiting from the outfall is in concentrated form and, therefore, potentially damaging to unprotected ground.

Question 14

Rectangular wire mesh baskets filled with rocks and placed on the ground as a protective lining are called ____.

A)riprap
C)erosion control mats
B)gabions
D)sod

Question 15

Inlets for a storm sewer system should be placed very far apart.