Page 134 - SMM2 eBOOK

SECTION V

DRAINAGE

Generally

V.1 Information

1. Work beyond the boundary of the site shall be so described and any restriction regarding
access, etc. shall be stated.

2. The natUre of the groUnd in which the excavations are to be made shall be given in
accordance with claUse D.1.

Drains

V.2 Excavation

1. Excavating pipe trenches shall be given in metres stating the starting level, the depth-
range in increments of 2.00m and the average depth within the depth-range to the nearest
0.25m.

2. Excavating curved trenches shall be so described irrespective of radius.

3. Trenches to receive pipes not exceeding 200mm nominal size may be groUped together
and so described. Trenches to receive pipes exceeding 200mm nominal size shall be
given separately stating the size of the pipe.

4. Excavating trenches to receive sUrface water drains stating the starting level (measured
the width of the foundations of the surface water drains therein) shall be classified as
follows:

a. Trenches not exceeding 0.30m in width shall be given in metres stating the average
depth to the nearest 0.25m.
b. Trenches exceeding 0.30m in width shall be given in cubic metres in accordance
with Section D.

5. Earthwork support, treating bottoms, filling in, compaction and disposal of surplus spoil
shall be given in the description.

6. Excavation below ground water level shall be given as extra over the trench in which it
occurs and any adjustment to earthwork support shall be deemed to be included.

7. Trenches next to roadway, next to existing buildings or in unstable ground shall each be
so described.

8. Trenches in rock as deEned in clause D.12.2 shall be described. Alternatively rock may
be given in metres as extra over the trench in which it occurs.

9. Breaking up concrete, reinforced concrete, brickwork, tarmacadam and the like shall each
be given separately in metres as extra over the trench in which it occurs stating the pipe
diameter as clause V.2.3.

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