The following may affect which equipment is offered. The site. Location of treatment plant within the site.
● ● ●
Invert depth of installation (where possible, locate to permit gravity flow into and out of the system).
Pumping equipment. Installation requirements.
Refer to manufacturer’s specifications and installation manual.
Access for maintenance and servicing.
Refer to manufacturer’s specifications and maintenance instructions.
● ● ●
The need for a sample chamber. Discharge point. Soil percolation area or other tertiary treatment.
14 Caravan Sites
Establish nature of communal blocks, i.e. toilet, shower usage, laundry, etc.
Where laundry equipment is installed, count the number of machines on site and period of use. Where possible, identify specific commercial machine details for volume and wash cycle duration.
Hydraulic loads of 100 litres per hour for 12 hours are not unusual.
Loading figures quoted assume that wastes from chemical toilets do not enter the system as they must not be allowed to enter into the treatment plant.
A cesspool may be installed to receive chemical toilet waste for separate disposal.
16 Documentation Records of the loads used to select and recommend the type and size of treatment systems should be maintained by the specifier and the customer. A typical example follows.
Package Plant Enquiry Sizing Sheet Our Ref. 123456 Date 10th August 2003 Site ABC Hotel 3★ Hotel Client New Architects & Consultants
FLOW LITRE / DAY
BOD GRAMS / DAY
SOURCE OF WASTE Description
No of rooms Occupancy
Domestic washing machine for tea towels only
Rooms Bar drinkers Non resident luxury meals Staff, full-time day staff Staff, part-time Laundry – all sent off site
30 mg/l SS
3 20 mg/l NH N
Total load(s) Effluent Quality Requested
50340 20 mg/l BOD
Suggested type of plant: XYZ. Invert: 1.0m. Power: 3-phase. Surface water: all to be excluded from foul sewer. Consent to discharge: to be obtained from the Regulator. Waste Disposal Units: assumed that none are fitted. Grease trap: required size “125”.
Notes Swimming pool – present, used for guests onl , all backwash wastes to be excluded. No function rooms or catering
Further information and guidance can be obtained from the British Water website – www.britishwater.co.uk
Company contact details are in the member list on the British Water website www.britishwater.co.uk
Copyright British Water 2005
First edition published 2004; revised 2005
Tel: +44 (0)20 7957 4554 e:firstname.lastname@example.org