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WorksheetsStormwater & Sub-soil drainage
Total questions: 23
Worksheet time: 19mins
Pump? (2)
Grinder
Up the jam
Mutrator
Bicycle 🚲
What are two approved points of discharge for a stormwater system?
Street kerb & Gutter
100mm pvc pipe through the fence to your neighbour's garden
Stormwater drain or easement
The ground
Pre-cast or in-situ pits can be installed at intersections or changes in direction.
True that
Na
What is used to move large pre-cast concrete tanks/chambers into place? (2)
Lifting and loading equipment such as chains, slings, trolleys and jacks
2 cans of monster and a bit of elbow grease
Excavator
Biggest meanest bloke on site, as long as he bends at the knees
What are three types of sumps and wells?
Stormwater pits
Wet wells
Arrestors
Charge and dump sump
What three are common terms for the authority-approved location of discharge for stormwater?
LPD
Approved point of discharge
Legal point of discharge
Water go here pipe
A chamber with an inlet that permits the entry of stormwater to a stormwater drain and allows access to the drain for maintenance, is?
Inlet pit
Stormwater pit
Inspection opening
Chamber of secrets
A chamber constructed within a stormwater drain or stormwater main to provide access for inspecting, testing or clearance of obstructions, is?
Inlet pit
Stormwater pit
Inspection opening
Look-in-it pit
A below-ground chamber for the collection of sewage or wastewater and fitted with a pumping device to raise the contents to a suitable disposal point, is?
Inlet pit
Sumper dumper
Inspection opening
Wet well
A pit formed in the floor of a structure or sunk below the general base of an excavation to collect unwanted water to facilitate its removal, is?
Sunk-it pit
Pump pit
Sump
Wet well
Apparatus designed to intercept and retain silt, sand, oil, grease, sludge or other substances that are a prohibited discharge to the sewerage or drainage system, is?
Arrestor
Silt filter
Inspection opening
Wet well
What is the minimum diameter for a stormwater drain serving a building on an allotment less than 1000 m²?
DN 90mm
DN 100mm
DN 150mm
DN 100m
Inlets and outlets of pits should be pointed towards each other where practical, and have a fall of ____mm?
50
20
25
All the
What can be done if you can't get the correct fall to the approved point of connection?
Fall all the stormwater drainage to a pit/well and install a submersible pump to discharge the stormwater to a point of gravity drainage
Snap a crowbar clean in half, then walk off
Dig the approved connection lower
Landscape the whole site so the fall can be achieved
Why should hard hats be worn in trenches?
Because loose debris such as rocks and soil may fall from above and cause serious injury
In case you bump your head on the trench ceiling
Because they look really cool and are very comfortable
To stop your head getting sunburnt.
What are three functions of a stormwater pit, other than receiving surface water, in a stormwater drainage system?
Junction connections
For clearing blockages in the drain
Change in direction and grade of the pipework
Somewhere for mosquitos to mingle
What standard is relevant to stormwater drainage?
AS/NZS 3500:1
AS/NZS 3500:3
AS/NZS 3500:2
AS/NZS 3500:4
If the staff reading at the upstream end of a trench excavation is 2.100, calculate the staff reading at the downstream end if there is a 200mm fall to that point.
2.300
2.400
1.900
2.100
Match
Designed to remove excess ground water
Sub-soil drainage system
Minimum cover for buried piping
Depth of cover
Authorised point of discharge such as a street kerb
Approved point of discharge
Access to a drainage system to clear blockages
Inspection opening and covers
How does a float switch control a submersible pump? (2)
When the water reaches a pre-set level, the float switch turns the pump on
When the water reaches a pre-set level, the float switch turns the pump off
When the water level falls below the pre-set level, the pump turns off
When the water level falls below the pre-set level, the pump turns on
What is the difference between a pre-cast and an in-situ concrete pit? (2)
Pits cast in-situ arrive on site as a finished product
Pre-cast pits arrive on site as a finished product
Pre-cast pits involve pouring concrete into a pit formed on site
Pits cast in-situ involve pouring concrete into a pit formed on site
What is an advantage of in-situ pits?
More cost effective using same batch of concrete for multiple pits
Time-consuming
Need to install formwork
Arrive ready made
What are disadvantages of in-situ pits? (2)
Concrete costs more
Time-consuming
Need to install formwork
Only available in certain sizes
