Lot Coverage. No more than thirty percent of the lot is covered by permanent buildings, and no more than twenty-five percent of the lot shall be covered by a sports court. No more than sixty-five percent of the lot shall be covered by any hardscape including permanent structures such as buildings, swimming pools, spas, gazebos, sports courts, bath houses, patios and pool decking, as well as driveways and walkways. If the city council finds that the proposed coverage will have an adverse impact on the city’s storm drain system, the permit may be denied notwithstanding the fact that the lot coverage requirement has been met.