General Questions
|
1
|
|
Who is responsible for management of the stormwater network?
|
|
|
a
|
Operation and maintenance?
collection network
water quality improvement devices
|
|
|
b
|
Compliance (e.g. water quality y)
|
|
|
c
|
What contractors are involved and what is the scope of their services?
|
|
2
|
|
Check that the relevant staff/ contractors are on the interview schedule
|
|
3
|
|
What do you see as the biggest risks associated with the stormwater network?
|
|
4
|
|
Have you experienced any flooding events? What were the impacts?
|
|
5
|
|
Does the stormwater discharge to an environmentally sensitive area?
|
|
6
|
|
Do you have any contingency plans in place?
|
|
7
|
|
Do you have any major asset renewals planned over the next few years?
|
|
Catchments
|
1
|
|
Please describe the topography and flow paths within the base (mark up a site plan)
|
|
2
|
|
Is there any flow from upstream of the base?
|
|
3
|
|
Has any flow monitoring been undertaken on site?
|
|
4
|
|
Have any stormwater hydraulic models been developed for the site?
|
|
5
|
|
Are you aware of any flood studies that have been undertaken in your area by other organisations (state or local government)?
|
|
Network Configuration
|
1
|
|
Can you describe the stormwater network?
|
|
|
a
|
Are there any channels and where do they exist?
|
|
|
b
|
Where does it discharge to? (how many discharge points and confirm the local authority/ water utility)
|
|
|
c
|
Can you draw up a simple schematic of the system?
|
|
|
d
|
Are there any areas of the site that do not have a stormwater collection network?
|
|
2
|
|
Is the site services plan spatially accurate?
|
|
|
a
|
What is the level of confidence in the data?
|
|
|
b
|
Does the plan include any recent developments (extensions, augmentations or renewals)
|
|
|
c
|
Has the location and level of the pits been surveyed (and when)?
|
|
|
d
|
Are the invert levels known and what is the level of confidence/accuracy?
|
|
3
|
|
What are the ground conditions across the various parts of the base – clay, sand, rock etc. ?
|
|
Network Development
|
1
|
|
What is the history of the system?
|
|
|
a
|
When was it originally built and have there been any major additions over the years?
|
|
|
b
|
Are there any new areas that may not be on the site services plan?
|
|
|
|
Service Levels
|
|
1
|
|
What is the level of satisfaction with the stormwater system?
|
|
2
|
|
Are there any areas subject to stormwater inundation/ flooding? What is the frequency and impacts?
|
|
3
|
|
What is the cause of this flooding? network capacity? building levels? outlet constraints?etc?
|
|
4
|
|
Have any remedial actions been undertaken (successful/ less successful)
|
|
5
|
|
Are there any known network capacity issues?
|
|
6
|
|
Have you undertaken any hydraulic modelling to assess the capacity of the system? Can we obtain a copy of the model and any accompanying reports?
|
|
Pipes and Channels
|
1
|
|
What materials are used?
|
|
|
a
|
Do you have a feel for the proportion of each (i.e. what is the most common material)
|
|
|
b
|
Were they generally installed at a similar time?
|
|
|
c
|
Are the materials accurately reflected on the site services plan?
|
|
2
|
|
Are pipe diameters accurately shown on site services plan?
|
|
3
|
|
Have there been any widespread recent works such asrelining or replacements?
|
|
4
|
|
Do you know what sort of condition the pipes and are in?
|
|
|
a
|
Have you undertaken any CCTV inspections and/or pit/ maintenance hole inspections
|
|
|
b
|
Can you provide us with the relevant reports
|
|
|
c
|
Are there any known problem areas? (sketch on plan)
|
|
|
d
|
What is the nature of these problems (blockages, breaks) what is the likely cause? Is it related to pipe age, material, depth or location or are the stormwater mains beneath heavily-treed areas
|
|
|
e
|
Do you have any reports prepared on these problems?
|
|
|
f
|
How have you addressed these problems in the past – what has succeeded, what has failed?
|
|
|
g
|
Are failures recorded in DEMs or other system?
|
|
5
|
|
Do you undertake any planned maintenance e.g.
|
|
|
a
|
Proactive cleaning/ jetting of pits, pipes and channels
|
|
|
b
|
CCTV inspections
|
|
6
|
|
Do you have any reports on capacity, condition or compliance?
|
|
Pits and Maintenance Holes
|
1
|
|
Do you know the condition of the maintenance holes?
|
|
|
a
|
What are the reasons for any poor condition (age, material etc)?
|
|
|
b
|
How often are they inspected?
|
|
|
c
|
What material – in-situ concrete or precast?
|
|
|
d
|
What types of maintenance holes cause you problems
|
|
Water Quality
|
1
|
|
Do you have any water quality improvement devices on site?
|
|
|
a
|
What are they and where are they located?
|
|
|
b
|
How do they perform?
|
|
|
c
|
What is the level of maintenance undertaken?
|
|
|
d
|
Are there any additional devices planned for installation?
|
|
2
|
|
Have you undertaken any monitoring of stormwater quality or quality of the receiving waters?
|
|
|
a
|
What were the reasons for the monitoring?
|
|
|
b
|
Could we please have a copy of the results
|
|
Questions for the Local Authority
|
1
|
|
Any issues in relation to stormwater discharge creating flooding on adjacent sites.
|
|
2
|
|
Adjacent existing development and future development that may affect flow from external catchments entering or impacting on the Defence site.
|
|
