On our Charles Church / Persimmon site there is a public open space, which the builders had to create as a condition of planning consent, which is not suitable for children to use because of an unfenced open watercourse running across it. The grass was sown in March; then there was a dry spell and no-one watered it; then there were several frosts; and then heavy rain washed the seed away. Now, we've had a nasty letter telling us to stop the kids going on it (as if....) so that the grass can bind the quality topsoil they laid down . NB they don't specify what sort of quality - we would say 'poor'.