Question:
When one's shoes are wet on Shabbos, is it permissible to walk on the grass, or is one considered to be watering the grass?
Answer:
It is permitted. The reason is since it is being dome mikassek, klachar yad, psik reisha dlo neicha leh, and it is only a minimal insiognificant amount, therefore it is permitted.
Sources:
Horav Y. Cahen Shlit"a