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<br />The City of Santa Ana has a Master Plan of Drainage to guide the <br />construction of adequate drainage facilities in the City. The <br />facilities include a series of underground storm drain systems, <br />open storm drain systems, catch basins and natural drainages. A <br />significant drainage impact can occur when existing rates of <br />surface water runoff are increased and existing drainage <br />facili ties are unable to accommodate the additional rates of <br />runoff. Existing rates of surface water runoff can increase <br />through the introduction of additional amounts of impervious <br />surfaces, or through changes to existing drainage patterns. <br /> <br />Approval of the proposed amendment to the Municipal Code to <br />establish a zoning ordinance for a Specific District and any <br />subsequent construction according to this zoning document would <br />not significantly alter existing drainage patterns or increase <br />existing rates of surface water runoff due to the proj ect' s <br />relatively small scale (less than one acre) . <br /> <br />F. Place housing within a lOO-year floodplain, as mapped on a <br />federal Flood Hazard Boundary or Flood Insurance Rate Map <br />or other flood hazard delineation map? <br />G. Place within a lOO-year floodplain structures which would <br />impede or redirect flood flows? <br />H. Place housing within a lOO-year floodplain, as mapped on a <br />federal Flood Hazard Boundary or Flood Insurance Rate Map <br />or other flood hazard delineation map? <br /> <br />No Impact <br /> <br />The City's General Plan identifies that portions of Santa Ana <br />are within the lOO-year flood Zone. Approval of the proposed <br />amendment to the Municipal Code to establish a zoning ordinance <br />for a Specific District and any subsequent construction <br />according to this zoning document would not cause development to <br />occur within areas subject to lOO-year flood risks. <br /> <br />J. Result in significant alteration of receiving water quality <br />during or following construction. <br /> <br />K. Could the proposed project result in increased erosion <br />downstream? <br /> <br />No Impact <br /> <br />Erosion refers to <br />surfaces by water <br />intensified with an <br /> <br />the removal <br />or wind. <br />increase in <br /> <br />of soil from exposed bedrock <br />The effects of erosion are <br />slope, the narrowing of runoff <br /> <br />7"460 <br />