Has anyone introduced the use of Water Butts as a water collection aid onto any project they hare involved in before? At present we are introducing such items onto a project for consideratiotn in achieving the desired points for sustainability. My only concern is that this has safety implications and stagnent water will become a problem. Has anyone any guidance in relation to Water Butts and requirements for cleaning them out, thus reducing the likelihood of standing water? I have looked at a few guidance docs on standing water, but can obtain v little information that is of relevance to this area. Many thanks