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The Control of Pollution (Silage, Slurry and Agricultural Fuel Oil) Regulations 1991

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Regulation 4(1)


1.  The requirements which have to be satisfied in relation to a slurry storage system are as follows.

2.  The base of the slurry storage tank, the base and walls of any effluent tank, channels and reception pit and the walls of any pipes shall be impermeable.

3.  The base and walls of the slurry storage tank, any effluent tank, channels and reception pit and the walls of any pipes shall be protected against corrosion in accordance with paragraph 7.2 of the code of practice on buildings and structures for agriculture published by the British Standards Institution and numbered BS 5502: Part 50: 1989(1).

4.  The base and walls of the slurry storage tank and of any reception pit shall be capable of withstanding characteristic loads calculated on the assumptions and in the manner indicated by paragraph 5 of that code of practice.

5.—(1) Any facilities used for the temporary storage of slurry before it is transferred to a slurry storage tank shall have adequate capacity to store the maximum quantity of slurry which (disregarding any slurry which will be transferred directly into a slurry storage tank) is likely to be produced on the premises in any two day period.

(2) Where slurry flows into a channel before discharging into a reception pit and the flow of slurry out of the channel is controlled by means of a sluice, the capacity of the reception pit shall be adequate to store the maximum quantity of slurry which can be released by opening the sluice.

6.—(1) Subject to sub-paragraph (2) below, the slurry storage tank shall have adequate storage capacity for the likely quantities of slurry produced from time to time on the premises in question having regard to—

(a)the proposed method of disposal of the slurry (including the likely rates and times of disposal); and

(b)the matters mentioned in sub-paragraph (3) below.

(2) Where it is proposed to dispose of the slurry on the premises by spreading it on the land nothing in sub-paragraph (1) above shall require the tank to have a greater storage capacity than is adequate, having regard to the matters mentioned in sub-paragraph (3) below, to store the maximum quantity of slurry which is likely to be produced in any continuous four month period.

(3) The matters to which regard is to be had under sub-paragraphs (1) and (2) above are—

(a)the storage capacity of any other slurry storage tank on the premises in question;

(b)the likely quantities of rainfall (including any fall of snow, hail or sleet) which may fall or drain into the slurry storage tank during the likely maximum storage period; and

(c)the need to make provision for not less than 750 millimetres of freeboard in the case of a tank with walls made of earth and 300 millimetres of freeboard in all other cases.

7.  No part of the slurry storage tank or any effluent tank, channels or reception pit shall be situated within 10 metres of any inland or coastal waters which slurry could enter if it were to escape.

8.  The slurry storage tank and any effluent tank, channels, pipes and reception pit shall be designed and constructed so that with proper maintenance they are likely to satisfy the requirements of paragraphs 2 to 4 above for a period of at least 20 years.

9.  Where the walls of the slurry storage tank are not impermeable, the base of the tank shall extend beyond its walls and shall be provided with channels designed and constructed so as to collect any slurry which may escape from the tank and adequate provision shall be made for the drainage of the slurry from those channels to an effluent tank through a channel or pipe.

10.—(1) Subject to sub-paragraph (2) below, where the slurry storage tank, any effluent tank or reception pit is fitted with a drainage pipe there shall be two valves in series on the pipe and each valve shall be capable of shutting off the flow of slurry through the pipe and shall be kept shut and locked in that position when not in use.

(2) Sub-paragraph (1) above does not apply in relation to a slurry storage tank which drains through the pipe into another slurry storage tank of equal or greater capacity or where the tops of the tanks are at the same level.

11.  In the case of a slurry storage tank with walls which are made of earth the tank shall not be filled to a level which allows less than 750 millimetres of freeboard.


The International Standard Book Number (ISBN) in respect of BS 5502: Part 50: 1989 is 0 580 172112.

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