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DocuSign Envelope ID:Al FOD76C-8E37-4295-AO8C-9A99498B56F7 <br /> 11 : <br /> haLff <br /> ■00000■ <br /> I nr7i l=;rrl I riy l r I(v(I 21� <br /> Ipid I e ,ir7('irl______ �u v7v mii m <br /> �u P ni Vw�, r'n uu n ti,vw W <br /> MO IN <br /> o TI B P V tl 7D — <br /> OPv Mu iii ;uwi 4u a uuy ��� <br /> i <br /> w <br /> ✓� a �� Hnur�,H�itiro�n, � � � � w rr <br /> e <br /> i" <br /> �r„ �li�,nV <br /> �(9 h Iln i ps Y GI 6wY <br /> ��� 8"�a Wd 7" d°i;�iu iGPJ wirVu u,r v uflu r¢ <br /> ,,,, <br /> 'roll <br /> iii. Aconcept uaIassess meInt HEC-RAS21D hydrauIicanalysiswiII be performed to determine local <br /> drainage patterns and flood risk within the airport based on the 25- and 100-year return <br /> events with Atlas 14 rainfall, 24-hour storm durations. The extents of the 2D hydraulic <br /> analysis of the airport will be as outlined in red in the figure below. This analysis will focus <br /> on existing condition overland flow utilizing LiDAR and breakline features. This assessment <br /> may include limited detention, culverts, or other drainage infrastructure of existing <br /> conditions. The conceptual assessment will evaluate existing condition runway and lot <br /> drainage.The initial flood risk areas will be further vetted in the next task. Halffshall obtain <br /> approval from the City Project Manager prior to beginning this analysis. <br /> 5 1 P <br />