If your allocation is less than this, you may have to consider shutting the course down. You will need to explain to policy makers and the public that daily irrigation of putting greens is often necessary during the summer to prevent turf loss. Detail how you are matching irrigation to the depth of the root system, and document your other efforts to improve irrigation efficiency. Emphasize that due to the shallow root system of the turf, less water will be used by careful daily irrigation than if higher rates are applied less frequently. You may find that people are more receptive to permitting daily irrigation when they understand the rationale behind it.
Limit carts to paths or roughs to lessen injury from traffic.
Consider the establishment of temporary greens if you expect a total curtailment of water allocation. Syringe just enough to maintain acceptable turf. As before, inspect the irrigation system for proper operation and uniform allocation. Raise the mowing height if you haven't already done so. There's not a whole lot that can be done except pray for rain.