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<br /> - 16 - <br /> TABLE 4 <br /> HYDROLOGY S~Y <br /> l- <br /> I-- <- storm Centered On <br /> Design MITCAT WITH BASE FLOW PEARSON LOG 111* Basin Below Tarn <br /> Point ...1Q.... ...li.. IRF SPF ...1Q.... ...li.. lRF SPF ...1Q.... ...li.. IRF ~ <br />Blue River Into Tarn 650 1100 1340 1780 440 484 527 555 <br />Blue River out of Tarn 450 800 900 1200 440 484 527 555 90 90 90 90 <br />Blue River at Lehman 450 800 900 1300 500 540 590 625 291 335 668 840 <br />Blue River at Illinois 450 800 900 1400 500 600 660 700 301 345 678 850 <br />Blue River at Sawmill 470 800 900 Mill! 550 617 673 708 306 350 683 855 <br />Blue River at French 500 850 1200 1900 1QQ 746 812 855 311 355 688 860 <br />Blue River North Barton 520 ( 8.50'; 1200 ;1950 I 75("--" 828 902 948 331 325 708 880 <br />at <br />Blue River at Swan(at Gage}580 900 1245 1980 1050 1150 1250 1320 376 390 723 2381 <br /> *Area Reduction Factor (:1 0.8 <br /> <br />NOTES: 1. Pearson Log III is a combination of rainfall/snowmelt runoff occurring during months of Mayor <br />June. Peak usually occurs mid-June;until that time rainfall falling on the snow reduces runoff. <br />After peak snowmelt runoff. rainfall increases stream flow. Goose Pasture Tarn has little or <br />effect on attenuating this storm due to the long duration hydrograph. <br />J\.cc""" <br />2. MITCAT storm is in basin above Tarn. Storm is summer thunderstorm type of short duration and <br />high intensity. Tarn effective in attenuating this type of storm. storm assumed to occur in <br />July or August when Blue River has moderate base flow. <br /> <br />3. The storm below Tarn is either MITCAT derived thunderstorm event'or statistical analysis reduction <br />whichever controlled, and OCCU30ver only one of the tributary basins of.the Blue River below Tarn. <br />A base flow is included. <br /> <br />4. The type of event which produced the maximun runoff for the frequency indicated is underlined and <br />was used as the design flow for flood plain delineation. <br />