GROUP 8 SHORT ASSESSMENT

What do you call to this casing that is a combination of a larger diameter?

• Microscopic Casing

• Telescopic Casing

• Binary Casing

• Straight Casing

Answer explanation

Telescopic casing is a combination of a larger diameter casing/screen portion and a smaller diameter lower casing/screen portion.

A _________________ cannot always determine in advance the depth at which an adequate water supply will be found. Neighboring wells offer some guidance but not a definite assurance.

Answer explanation

A drilling contractor cannot always determine in advance the depth at which an adequate water supply will be found. Neighboring wells offer some guidance but not a definite assurance.

It is the process of removing fine sediment and drilling fluid from the area immediately surrounding the perforations.

• Drilling

• Well Completion

• Well Development

• Well Head Protection

Answer explanation

• Well development is the process of removing fine sediment and drilling fluid from the area immediately surrounding the perforations.

• This increases the well’s ability to produce water and maximizes production from the aquifer.

It serves as an intake mechanism that allows groundwater to enter while blocking the entry of other substances like sand, gravel, and rocks.

• Well Screen

• Casing Diameter

• Well Depth

• Estimated Well Yield

Answer explanation

Well Screen serves as an intake mechanism that allows groundwater to enter while blocking the entry of other substances like sand, gravel, and rocks.

It is also designed to prevent the walls of a borehole from collapsing, providing a structural support in unstable areas such as loose aquifers.

What do you call to the difference between the static water level and the pumping water level?

Answer explanation

DRAWDOWN is equal to the difference between the static water level and the pumping water level.

How can we calculate flow volume/discharge?

• Flow from a Horizontal Blow-off Pipe Method

• V-Notch Weir Method

• Water Method

• Volumetric Method

Answer explanation

Flows can be determined by measuring volume.

An empty oil drum is used as the container. Determine the yield of the well using the volumetric method.

DATA:

Volume of container used = 250 L

Time to fill the drum = 36 s

• 6.49 lps

• 9.64 lps

• 6.94 lps

• 9.46 lps

Answer explanation

FORMULA:

Q = V/t

Find the flow in a 55 mm pipe flowing full where the drop is 0.43 m (y axis) and the carry is 0.75 meters (x axis).

In two decimal places only and with unit.

Calculate the dropdown where bulb lit when cord measured 10 m before pumping and bulb lit when cord measured 15 m while pumping.

• • - 5 m

• 5 m

• • - 2.5 m

• • 2.5 m

Answer explanation

FORMULA USED:

D = PWL - SWL

Draw an emoji that best represents how you are feeling right now.

Answer explanation

Give yourself a well-deserved pat on the back – you did your best, and that's what truly counts in the journey towards progress and growth.