water quality is an issue, things to look out for are sediment runoff, excessive nutrients eg. from animal waste or fertilizers, salinity problems and pesticide runoff.
water quantity is an issue especially during times of drougt. irrigation has to be carefully planned, since if done irresponsibly, a majority of the water can be lost through evaporation.
government legislations are put into place to help manage the use of water. water licenses are required to extract water from catchments, but it's allocations that matter. allocations dictate how much water a farmer can use during a year based on their license. sometimes they might not be allocated any at all, but have to pay license fees anyway
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