Drainage channels - Patent 0928850

(19)

(11)

EP 0 928 850 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	27.10.1999 Bulletin 1999/43

(43)	Date of publication A2:
	14.07.1999 Bulletin 1999/28

(21)	Application number: 98310210.4

(22)	Date of filing: 11.12.1998

(51)	International Patent Classification (IPC)⁶: E03F 3/04, E01C 11/22

(84)	Designated Contracting States:
	AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
	Designated Extension States:
	AL LT LV MK RO SI

(30)

Priority:

09.01.1998 GB 9800473

(71)	Applicant: HODKIN & JONES (SHEFFIELD) LIMITED
	Dronfield, Sheffield S18 6XP (GB)

(72)	Inventor:
	Monks, David William Hope Valley, Derbyshire S32 1BQ (GB)

(74)	Representative: Knott, Stephen Gilbert et al
	MATHISEN, MACARA & CO. The Coach House 6-8 Swakeleys Road Ickenham Uxbridge UB10 8BZ Ickenham Uxbridge UB10 8BZ (GB)

(54)	Drainage channels

(57) A drainage channel section has an interior flow-confining surface including an elongate planar floor (12) having spaced parallel side edges. Two side walls (14) project outwardly from respective side edges of the floor (12) and each side wall is formed by an upper wall portion (15) and a lower wall portion (16). The lower wall portions (16) extend upwardly and outwardly from the floor (12) at an angle α. The width of the floor (12) may be between

and

where W is the width of the channel between the outer edges of the lower side wall portions (16). The height of these edges above the floor may be

where α is between 45° and 75°. This provides good flow capacity and sediment transportation. It also allows the sections to be free standing and to be stacked in pairs with one section of the pair inverted and the side wall of the inverted section located between the side walls of the other section.

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