The daily water loss of about 1% was near the expected range of 0.5–10% reported previously The total annual water demand to maintain the system was 36.9 m3 in 2013 and 35.0 m3 in 2014. Comparing between years, there were natural variations in the amount of monthly water use, for example May 2013 had less water use than May 2014. The need for water addition was greater in warmer months than cooler months, and relatively similar between the two years in the study period