How much water can I get through my screen

One question I get asked reguarly is this.

“How much water can I get through my screen”?

This can be calculated, so I designed a online calculator on the web site that can easily help you
get the answer you need plus  there are charts where the calculation has been done for you.

The link to the calculator is

The Data sheet

Let me explain the difference between flow and velocity.

Flow is the amount of water coming through the pipe, the larger the pipe the more flow you can have.
can be expressed as “litres per second”

Velocity is the speed of the water flowing through the pipe.
Meters per second.

An Example is, if you are standing in front of a large pipe and the water is flowing out slowly, you could stand in front of this, and get knocked down possible, but if it flows at a great velocity
it would knock you down quickly and no chance of getting up.

A fire truck water hose has a lower flow but massively high velocity, this is why you will often see 2
fireman holding the hose, as it would fling one person.

If your slotting pattern or pipe size is not on the data sheet then please use the calculator.

In part 2 on this topic, which will be sent next week, we will look at the factors needed,
when designing the screen for your bore.


Quote of the Week


“Those who stand for nothing

fall for everything”


By  Alexander Hamilton

Ps I still have a couple of the 100mm cl12 swj screens on special.

if you are interested let me know.

PSS. Just warning you december is looming

we will be closed from the 22nd to 3rd of Jan

Warmest Regards

vic b.gif

Victor Little


Email –

Ph- 1300 133 000

Mob- 0457 819 610

Fax – 03 59 414 148

Bore Screen Names

It’s always hard for everyone when a product has more than one name and that name is also associated to a completely different product.

This is the case with bore screens, this specialized product in its standard formation , is made from UPVC pressure pipe and is slotted with horizontally around the pipe, standard slotting is 0.8mm wide slots with 10mm between the slots and between 3 and 8 rows around the pipe.


Some of the different names and types, that people use, plus the different spelling are


Bore Screen

PVC slotted Pipe

Slotted pipe


Slotted casing

Standpipe piezometer

Pvc screen

Screened casing

Sand screen

Sand spear

Wedge wire screens

Johnson Screen


Well screens

Filter pack

Monitoring screen

Wire wrapped screen

Wire mesh screens

Perforated or punched screens

Wrapped wire screens

Machine slotted screens

Well points

Lowering spears

Water   Bore screens

Happy New Year


Wishing you a Happy and Successful New Year,

2015 is here and the pace of work Is slowly building up already.

When I was home enjoying the break, I was thinking about 2015 and what I needed to do and what I would like to do

I knew that I didn’t want to make any sill new year resolutions that get broken immediately, but I knew that I needed to change things to ensure that

My plans would happen.


How do you make a good plan when there is an event that could change your life and your not in charge.


It’s a bit like when a worker gets seriously hurt and you’re the manager, your life gets turned upside and possible Jail.


Next week I go to court over my Grandkids, and who knows what the judge will do, so until then my plans are put on hold.


This has not stopped me looking ahead and planning areas that I am still in  control off, In the next news letter which will be a Jan – feb issue

I will have some links to slides and handouts that will help you look at 2015 in a new way and may be change your thinking of setting goals.

Setting goals may be hurting you not helping you.


With DTH closing we are looking at ways to fill this hole that has been left by them and looking at better ways how we can help you.


If you have any specific needs please feel free to contact us and see if we can be of assistance to you.


Look out for our Australia Day specials coming soon





Brooke’s quote of the week

“Always assume that your opponent is going to be

Bigger, stronger and faster than you: so that you learn to rely on technique, timing

And leverage rather than brute strength”

Helio gracie

App of the week

Bill Guard –

connects to your online credit card statements and flags  merchants who frequently charge for products and services.

You never forget who you are financially committed to.

Enjoy !

Product of the week


A cellulose based product that is used to improve borehole stability by improving  invasion control,

Seepage and other loss control situations.

Advantages –

Control seepage loss

Stabilises unconsolidated sand formations

Stabilises  coal beds

Prevents  stuck pipes

Compatible with most drilling fluid additives

Reduces  torque and drag

Environmentally friendly

Helps minimize formation damage resulting in high reverse

Permeability and increased production.


Special of the week

PVC 100cl12 screens swj 6m

1.5mm slots

2 packs available

PVC Pipe Buyers Beware – Is your pipe AS1477 Approved ?

The pipe you used on your last project, Do you know where it was made?

If you get a call tomorrow that the pipe has just broken under ground and your client is yelling down the phone

“fix it fix it”. Who will you be calling if the pipe was the failing component?


I would like to share with you 3 important tips that will help ensure complete success with the added bonus of

backup service by Deps should you need it.

Live on YouTube


Is your PVC Pipe meeting AS1477

Hi its Brooke from Deps here.

Today I would like to share with you 3 important things that could make or break your up coming project and as we all know delays in pipe manufacturing, delays in delivery to site can cost tens of thousands of dollars that’s what we want to avoid here.  So my top 3 tips for you before you begin your project Is to investigate, investigate and research were your pipe comes from and how and were it is manufactured.

Here at Deps we pride ourselves on 3 things and this is a question we ask all our customers who are buying pipe from elsewhere, we like them to be informed of what they are purchasing.

Does your pipe meet As1477 standard this is an Australia standard of pipe manufacturing.
Lots of manufacturers in Australian create quality products and quality pipe but over recent years we have found there to be an influx of imported pipe.
This pipe is manufactured overseas, we are unaware of the standards it is manufactured too and we don’t know its capabilities, Australia has very tough underground terrain that we need to be aware of so we need quality pipe going under ground. Australian manufacturers are aware of this and manufacture there pie to meet these standards, they re always continuing to grow there product range and improve on there quality when ever any issues come up, imported pipe has no standards it is not tested when it comes into Australia and you don’t know how it has been manufactured or where it is coming from. And if its coming from Australia your always guaranteed where it has come from.

* How can you tell if your pipe is imported.
There are some key components on every piece of pipe that is put in the ground there should be a stamp on it, with the manufacturer, the standard that it meets and the time and date it was manufactured this wont be on the imported pipe there will be none of this, so times there will be a discolouration in colour, standard PVC pipe is a sharp white, a lot of your imported pipe can be an off white colour, when you purchase pipe your manufacturer should be able to supply you with a certification certificate this certification certificate will be an Australian standard AS1477 and if they cant provide you with this then the pipe is not Australian made

Your client may require a special slot pattern so this is my second tip.

A lot of imported pipe cannot be slotted that’s not to say it all cant be, we have come across some that can be slotted when it gets to Australia, but 9 times out of 10 when you get your pipe from Australia you can slot it you can thread it to what ever pattern you like…….. (to be continued)

Case Study 49 – Sub Soil Drains

Case Study 49 – Sub Surface Drains

Sub surface drains are installed in permeable and porous soil to collect and convey drainage water. They are especially installed deeply underneath the ground to evacuate excess water from permeable soil. If the drains are installed carefully with proper planning, then they will provide problem free service for several years with minimum maintenance.

Although subsurface drains are expensive and costly, they are effective in controlling stormwater as well as lowering groundwater table. They are extensively used to improve soil atmosphere for vegetative growth and avoid water seepage in wet areas. They are helpful in controlling ground water in irrigated areas and removing excess water from ponds, high-rise buildings, parks, sports stadiums, railway stations and airports.

They will reduce the soil erosion and improves stability in soil. They are also known as relief drain, tile, underground drain, drainage tile and interceptor drain. They are not limited to wet lands, but can be used in all types of lands, but the soil must have sufficient deepness and permeability to allow easy installation and maintenance of subsurface drains.

Subsurface drains are usually installed, where excess ground water in the soil causes soil erosion and landslides. In order to stabilize slopes, toughen construction foundation and strengthen retaining walls, subsurface drains are ideal.  They usually consist of subsurface main drain and outlet. Water is collected and conveyed through the main drain and sometimes, water is collected through laterals.

The installation should be carefully planned to limit the damage caused by soil infiltration, floating ice, rodents, etc. Base drainage layer, filter layer, collector pipe and outlet pipe are the components of the subsurface drains. In addition, they are of four types:

  1. Corrugated and PVC slotted subsurface pipes
  2. Mole drainage
  3. Interceptor drains
  4. Ground water pumps

The minimum diameter of the subsurface drains should be 4 inches and maximum diameter depends of the condition of the soil and particular area, where the drains are supposed to be installed. Filter material like geo-textile fabric is used around the drains for proper blockade of filtration of soils. The outlet drain should have 10-foot section of cast iron or PVC pipe without perforations to limit water clogging and jamming.

The subsurface drains should be inspected on regular basis for any accidental pipe breaks, soil infiltration and water clogging. The debris should be removed immediately and if the pipe is broken, replace the particular section right away. If they are installed beneath highways, where heavy vehicles passes regularly, then they should be inspected on regular basis for proper functioning.