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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />APPENDIX I I I-A <br />HYDROLOGICAL APPENDIX <br /> <br />RAINFALL <br /> <br />Depth-duration-frequency curves were developed for the basin to represent <br />the various frequencies of design rainfall. These curves were determined <br />from the isohyetal maps present in the Rainfall Section of the ORCOG <br />Storm Drainaqe Criteria Manual and are shown in Figure I II-A. The time <br />incremented rainfall is derived from these curves, rearranged to a design <br />rainfall for the various frequency events and presented in Table II I-A. <br /> <br />TABLE III-A <br /> <br />INCREMENTAL RAINFALL DATA <br />(All Values in Inches) <br /> <br />.Time Incremental Rainfall For Various Frequencies <br />(Minutes) 5-Year 10-Year 50-Year 100-Year <br />0 0 0 0.00 0.00 <br />10 0.03 0.04 0.06 0.06 <br />20 0.06 0.08 0.09 0.10 <br />30 0.14 0.22 0.25 0.25 <br />40 0.59 0.80 0.95 1.04 <br />50 0.19 0.30 0.30 0.36 <br />60 0.09 0.10 0.15 0.28 <br />70 0.08 0.10 0.12 0.17 <br />80 0.05 0.06 0.08 0.09 <br />90 0.04 0.05 0.06 0.09 <br />100 0.04 0.05 0.06 0.08 <br />110 0.04 0.05 0.05 0.08 <br />120 0.03 0.04 0.05 0.08 <br />130 0.03 0.04 0.05 0.07 <br />140 0.02 0.04 0.04 0.07 <br />150 0.02 0.02 0.04 0.04 <br />160 0.02 0.02 0.03 0.03 <br />170 0.02 0.02 0.02 0.02 <br />180 0.01 0.02 0.02 0.02 <br /> <br />III-A <br />