Class D 400 cover and frame to BS EN 124 600 x 600 clear opening (see note 6)

10 (min) to 15 (max) cement mortar bed and surround to designation (i) to SHW series 2400

X 225 brickwork 2-3 courses (See Note 7) E

Reinforced precast concrete cover LO r-slab (Heavy Duty) on 10 mortar --------+- (0

bed to designation (i) to SHW r;:::::;;:::=;;=~Fl---~---7r------7F~~;.:;:::;;;:::;il--- Geotextile filter material series 2400 to be wrapped over stone fill

0 U) LO ._

Step rungs to BS 1247 NO (See Note 15)

Flexible joints to be as shown on catchpit detail 0 0

Hole to be made good around pipe

0 0

Precast concrete perforated chamber rings

0 0

Void to be lined with geotextile filter material and filled with 40 nominal size clean stone

0 0

10 mortar bed to designation (i) to SHW series 2400

GEN 3 concrete base with--------¼P~N""-,.._ 0 LO N Section A-A formed hole in centre

Base of excavation to be lined with Geotextile material lapped

225 300 min 150 mm up sides of excavation

Bottom step to be within 400 mm of base concrete

Drawing Number

so 500 BC Notes

1. All dimensions are in millimetres.

2. Chamber size to be the largest possible in the area available.

3. Storage capacity to be based on 100% run-off from surrounding impermeable area.

4. Soakage tests in accordance with BRE Digest 365 are required prior to construction. Soakage rate for the trial to be three times the design rate.

5. No part of the soakaway may fall beneath the carriageway or footway.

6. Cover and frame to be Class D400 Badgemarked, HD, and Kitemarked and have a protective coating complying with BS EN 124: 1994. In areas of block paving an 'infill' type cover may be required.

7. Bricks to be Engineering Class B laid in English bond in mortar to designation (i) to SHW series 2400.

8. Precast concrete chambers shall comply with BS 5911 Part 200.

9. Perforations to be 40 dia at 450 centres.

10. Top ring may be unperforated.

11. Finish to internal concrete to be F1 on formed surfaces and U2 on unformed surfaces.

12. Ends of pipes shall be neatly built into chamber and finished flush with Class 1 mortar.

13. The nearest joints to chamber shall not be restricted by concrete.

14. Petrol interceptors may be required where soakaways are used.

15. Chambers more than 3m deep must be provided with galvanised ladders.

16. Surface level tolerance +0 -6 in paved areas. + 15 -15 in verges.

Do not scale this drawing

C APR 19 Updated title block NR B Jun 13 Concrete grade revised KPT A Mar 11 Various minor amendments KPT

Rev Date Checked

Drawing No.

SD/500/BC Scale NOT TO SCALE Date MAY 04

Department of Place, Planning & Regeneration

~~ tJI Bracknell ,-A Forest

Council

Project

Title

STANDARD DRAWINGS

SOAKAWAY PRECAST CONCRETE CONSTRUCTION