Reservoir, Kirnie Law

Boving & Co, London (hydraulic engineers), Melville Dundas and Whitson (contractors) and J Sharp (consulting engineer) for Henry Ballantyne and Sons, Limited; started 1919 - operational 1922. Free standing, square-plan reservoir with subterranean 12in. cast-iron pipe leading to tall square-plan tower containing surge tank. Ferro-concrete with cast-iron pipes, all steel riveted.

RESERVOIR: square-plan, ferro-concrete reservoir with tapered side walls (8 in. thick at top tapering to 14 in. in the upper 10 ft. 6 in before broadening to 21 in. at base) with reinforced concrete base. SE elevation formerly with advanced concrete lettering reading HENRY BALLANTYNE AND SONS, LTD KIRNIE LAW RESERVOIR (hole now blown through centre); overflow/sluice ramp to left of lettering; to far left, iron ladder leading to concrete viewing platform to top of angle (further ladder on other side leading down into reservoir). All other elevations plain except for a projecting concrete lean-to (which housed electrical recording appliances connected with the Barograph Recorder in the mill and showed, amongst other things, height of water in reservoir) at S angle and the outlet and inlet valve.

INTERIOR: 192 feet square by 15 ft. 6 in. deep reservoir. 9 in. thick concrete floor slab (light reinforcement near upper surface) increasing to 18 in. thick approximately 6 ft. from inner face of walls; floor slab continues to form 2 ft. thick toe to exterior of wall (slab 21 in. thick under wall to 9 in. thick at outer point). Side walls heavily reinforced and tied to floor slab and given a fine plaster finish.

SURGE TANK: tall square-plan ferro-concrete tower with projecting angle margins encasing surge tank; 9 inch steel riveted high pressure pipeline set within ground to front with pair of access man-holes with cast-iron covers (one now missing), lesser pipe adjacent to left.