What is the WDA?
The Well Drillers Association consists of companies and individuals engaged in well construction, test pumping, maintenance and rehabilitation. It is not open to manufacturers and materials suppliers but a number of our members act as distributors for well-related equipment including pumps. The Association mainly acts as a forum for members to discuss the industry, technical specifications, contract problems, training and the potential impact of legislation on the industry. It also maintains close contacts with the Environmental Agency (EA), the British Geological Survey (BGS) and the various Water Authorities and Water Companies.
Does the WDA publish a Specification for water well drilling
The WDA web site contains Guidance Notes for the Construction of Boreholes for Water Supply which provides guidance for well drillers and clients on what is good practice from contractual arrangements, technical considerations, related specifications and water resources legislation. The Guidance Notes are not currently binding on WDA members due to the varied nature of site and geological conditions but they are expected to follow them wherever possible.
What does a borehole cost?
The cost of a borehole is dependent on the geological sequence, the nature of the water bearing stratum or aquifer and the depth to standing water in the borehole. It is also dependent on the yield required and the access to the borehole location. Some boreholes require a well screen and a gravel pack to restrict the amount of fine materials pumped through the borehole. Individual members should be approached initially for a guide price and then for a written estimate. Remember to include the cost of the pump, rising main, electrics and discharge in any estimate.
Do I need a Licence to drill a water well
In England and Wales under the Water Act 2003 any borehole or well yielding less than 20 cu metres per day (4400 gallons per day) does not currently require a consent to drill and test pump or to extract water up to that limit. For intended yields in excess of 20 cu metres per day then a Clause 32 Consent is required from the local EA to drill and test pump any borehole and an extraction licence is required to pump the borehole after the test pumping is completed.
In Scotland, under the Water Environment (Controlled Activities) (Scotland) Regulations 2005 (CAR), application to SEPA for authorisation is not required for drilling and abstraction from any borehole intended for the abstraction of less than 10m3/d, intended for the purpose of dewatering or intended for the abstraction of < 150m3/yr where this is for the purpose of test pumping or sampling as this is covered by a general binding rule.
Records of any drilling deeper than 15 metres and the test pump records are required to be send to the BGS at Wallingford. The records should also be retained with any property deeds.
Can you put me in contact with my local well driller.
The WDA web site contains a list of well drilling organisations who are members with details of addresses, telephone, facsimile and e mail references as well as contact names. Most WDA members operate nationally so their office address and the distance to your site is not always relevant. As a trade association the WDA cannot give preference to one Member over another.
How do I draw up a contract and specification for a borehole
The WDA Guidance Notes for the Construction of Boreholes for Water Supply contains information about what is required in a borehole. Any drilling organisation should produce a written estimate fully detailing the construction and expected depth of the borehole, the installation proposed including the method of sealing the borehole against surface contamination and the pump and headworks detail. Any additional work should be detailed and costed in writing during sitework not afterwards.
How big a borehole do I need
A normal domestic borehole usually has a maximum finished diameter of 150mm although boreholes with a finished diameter of 100 or 125mm can be used with certain ground conditions to accommodate a 100mm outside diameter pump and cable. The average depth of a domestic borehole is between 40 and 70 metres depending on the hydrogeological conditions encountered
How much space is needed for the construction of a borehole
Except for the most shallow boreholes the minimum working area required is generally 20 metres by 15 metres with access to the borehole location being suitable for a large lorry mounted drilling rig. Wet drilling slurry must either be disposed of on site or taken away in a skip or by tanker.
How do I get a Hydrogeological Report on my site.
What do I get in a BGS Prognosis
The BGS report will give an appraisal of the likely geology in the area based on known geological maps, memoirs and borehole records. It will also refer to known boreholes in the area with brief details of depth, water levels, yields and the aquifer penetrated. It will give a suggested borehole depth and diameter for your site and the likely flow rate. The Prognosis obviously contains caveats on the report recommendations.
What about borehole contamination
The main source of borehole contamination is from leaking septic and fuel tanks and from animals kept close to the borehole location. All borehole installations must be properly sealed below ground level either by grouting or concreting a steel casing into a clay type zone or into rock head or by sealing any Pvc casing or well screen to at least 5 metres below ground level. The WDA Guidance Notes for the Construction of Boreholes for Water Supply provides good general advice on contamination protection, including the recommended methods for manhole construction. The EA also has two related publications called “Water Supply Borehole Construction and Headworks – Guide to Good Practice” and “Groundwater Source Protection Zones”. SEPA has produced a document on “Water Supply Borehole Construction and Headworks – Guide to Good Practice.
Is the quality and quantity of water guaranteed
The key element to minimise the risk is to obtain as much information as possible prior to committing to a drilling programme, hence the recommendation that a borehole prognosis be obtained. Whilst this is not a guarantee of success, it can highlight risk at an early stage. There will always be an element of risk that no water will be found, and this needs to be fully understood by all parties.
Is treatment necessary
Water must be ‘potable’ ie it must be safe and of drinkable quality. Any new borehole supply should be tested by a local public health laboratory. In many cases the water will require no treatment. However, if there is any evidence of bacterial contamination, an ultraviolet (UV) sterilisation unit and pre-filter should be installed. This uses UV light to kill the bacteria, and make the water safe and does not taint the water. If the water is turbid—muddy or cloudy with suspended particles—in-line filters can be used to provide good clear water. If the general public is likely to drink water from the supply, it is recommended that a UV sterilisation unit is installed to demonstrate that all possible steps have been taken to eliminate possible risks.
Can both a mains and a borehole supply be connected to the property?
Current water supply regulations require that protection must be provided against backflow into a mains water system. This can be achieved by either a total permanent disconnection from the mains water supply or a complete separation of the mains from the borehole supply with no means of interconnection and with both supplies being clearly labelled or an air gap system complying with Section 6 of the Water Supply (Water Fittings) Regulations 1999.
How do I complain about the workmanship of a WDA member (and non members).
Detail the site location, the contractors name and contact and the nature of the problem. Ask whether the contractor has been advised of the complaint and what was his response. Advise the WDA Secretary of the details and the Secretary or the Chairman will respond.
How do I abandon a well
Obtain details of the well location, its depth and diameter, any installation and cross beams and the nature of its construction. If it is a large diameter well advise the client and any contractor not to enter the well without full compliance with Health & Safety Legislation. The EA booklet “Decommissioning Redundant Boreholes and Wells” gives guidance on the abandonment of boreholes. SEPA has a similar document and the Water Environment (Controlled Activities) (Scotland) Regulations 2005 (CAR) General Binding Rules 3 & 4, set conditions for backfilling and sealing boreholes.
Can I learn more about Groundwater
The UK Groundwater Forum (01491 838800) have issued a booklet called “Groundwater our hidden asset” which is a layman’s guide to groundwater.
How do I join the WDA
All Applicants must have a proven record of experience in well drilling and pump installation over a number of years and be sponsored by an existing WDA Member. The application form sets out the criteria for election. After successfully completing the application form which is circulated to existing members the application together with any member’s responses and the Secretary’s report on the Applicant and any visits to their offices is discussed and voted on at the next Quarterly Meeting. If a majority of those Members at the meeting are in favour then the Applicant will be deemed elected.
What is the WDA?