CBRM Floodwater Containment and Mitigation Project ​

The purpose of this interview is to objectively summarize the Phase 1 report submitted to the CBRM entitled 'Wash Brook Floodwater Containment and Intensity Mitigation Project'. Lead Engineer for the Project, Alexander Wilson of CBCL answers questions regarding scope and capacity of the project. 

Intro/Question 1

What are the goals of the project, and boundaries of the watershed?

Question 5

How do native soil and geology conditions in the watershed impact flood reduction initiatives?

Question 9

What was the October 'Thanksgiving Storm' classified as on the 'return period storm scale'?

Question 13 

What are the differences between structural and non-structural floodwater mitigation measures? 

Question 17

In general, how do berms operate and are they difficult to maintain?

Question 21

What will Phase 2 of the project consist of?  

Question 2

What is the Flood Risk  Investment Program for Nova Scotia? 

Question 6

How does climate change impact flooding in the Washbrook watershed?

Question 10

What were the causes of the 'Thanksgiving Storm'?

Question 14

What structural mitigation measures did you determine to be the most effective?


Question 18

Could measures such as bioswales, rain gardens, detention tanks and trees help in the Washbrook?

Question 22

What approvals and assessments are required prior to construction? 

Question 3

How do engineers measure how much water moves though the watershed and infrastructure? 

Question 7

Can you explain what 'return frequency storm' classifications mean?

Question 11

How much of the surface flooding can be attributed to runoff from impermeable surfaces? 

Question 15

Can you explain the levels of effectiveness compared to stakeholder acceptance of options 5A and 5B? 

Question 19 

What non-structural flood risk mitigation measures were recommended for CBRM? 

Question 23

How does natural water retention from mature forest compare to man-made structures? 

Question 4

Did the study consider seasonal impacts such as snow melt, frozen ground, etc.? 

Question 8 

Why were 1 in 20 and 1 in 100 return period of storm used in this study?

Question 12

Which areas of the Washbrook were determined to be the most vulnerable to flooding? 

Questions 16

Will the Baille Ard trail system still be accessible to the public if Pond 5 is constructed?

Question 20

What are some things home owners can do to flood proof their homes? 

Question 24

Will the Washbrook watershed  flood again?