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pumps underground water from water wells pump ground water remaining seven water wells City's distribution system. 21 water wells. Fourteen of the into small surface reservoirs. The pump underground water into the Approval of the proposed general plan amendments would not impact underground supplies, in that the proposed amendments would not involve any activities that would encroach into the underground water basin, impact the quality of underground water supplies or prevent the recharge of underground water supplies. C. Substantially alter the existing drainage pattern of the site or area, including through the alteration of the course of stream or river, or substantially increase the rate or amount of surface runoff in a manner, which would result in flooding on or off-site? D. Create or contribute runoff water which, would exceed the capacity of existing or planned stor.m water drainage systems or provide substantial additional sources of polluted run-off? L. Result in increased impervious surfaces and associated runoff? M. Create a significant adverse environmental impact to drainage patterns due to changes in runoff flow rates or volumes. No Impac t The City of Santa Ana has a Master Plan of Drainage to guide the construction of drainage facilities in the City. The existing drainage facilities in the City include a series of underground storm drain systems, open storm drain systems, catch basins and natural drainages. A significant drainage impact can occur when existing rates of surface water runoff are increased and existing drainage facilities are unable to accommodate the additional rates of runoff. Existing rates of surface water runoff can increase through the introduction of additional amounts of impervious surfaces, or through changes to existing drainage patterns. Approval of the proposed general plan element amendments would not increase existing rates of surface water in the City, in that the proposed amendments would not introduce additional amounts of impervious surfaces into the City or result in changes to existing drainage patterns. Therefore, the approval of the proposed general plan element amendments would not result in significant drainage impacts. 12 7l)t):1t)