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AS I3U1LT DETENTION VAULT CALCULATI(�NS <br /> To check the detention vault size for this project,the runoff for this project was <br /> calculated for the 100- year design storms using the Santa Bazbara Unit Hydrograph <br /> methodology (SBUH), using the Stormshed2g computer program by Engenious Systems. <br /> A summary of the existing and developed basin breakdowns are included below. <br /> Refer to the following pages and Sheet C4 of the As-builts for more details. <br /> Evcrett Office Building—Detcntiou Vault <br /> DETENTION SUMMARY CHART <br /> STORM LIVE STORAGE VOLUME(CF)* DEAD STORAGE VOLUME(CF� RELEASE RATE(CFS) <br /> EVENT Required Designed As-built Required Designed As-built Required Designed As-built <br /> 2-yca: 7,276 7>277 _ 7>486 _ N/A 6,402 __ 6,082 0.02 0.02 0.03 <br /> 10-year 7,G40 7,G40 7,653 N/A 6,402 6,082 0.11 0.1 I _ 0_I 1_ <br /> 100-year 8,40G 8,408 8,497 N/A 6,402 6,082 0.26 0.26 0.28 <br /> Design Impervious area—6,100 Sf• Includes 42% factor of safety <br /> Rcfer to the following pages for more details. <br /> , � <br /> � <br />