Reducing the level of clay subsoil base at the Kirkstall Lane end of the outfield
Because of the thickness and stability of the turf, it was agreed that the club could hold three consecutive days of pre-season friendly games on the outfield, the first of these starting just five days after the final turf had been laid
Installation of new pipe drains
around 2,000m³ of surplus cut material that had to be carted off site to a tip. Some of this material was used for local filling purposes, mainly to the east of the square, but the bulk of the material, which comprised clay subsoil, was stockpiled at the south-west corner of the outfield before being removed. On completion of the regrading works,
the next requirement was to install a total of 3,000m of ducting for the future floodlighting system. This necessitated installing clusters of 150mm diameter twin walled plastic pipe, with each section comprising between two and five pipes running around the outer edges of the outfield. Once laid, the trenches for these ducts were backfilled to the sub- base level with a “fill” sand.
In addition, a single general purpose duct was laid around the very edge of the
outfield, together with replacement ducts for the CCTV/alarm cabling running along the southern boundary. It was only at this stage that a start could then be made on installing the new pipe drainage system.
An early decision was taken to install the drains after grading and prior to returning the topsoil, which goes against normal convention. However, the risk of returning the topsoil on the exposed clay sub-base without any drainage being present was considered too great, owing to the timing of the works during the late winter period.
A network of 80mm lateral drains was
therefore installed at 4m intervals over the entire outfield (excluding the central square), and these were connected up to a series of 125mm collecting drains via strategically placed silt chambers. The
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