11-27-2017 Council Packet - Laserfiche WebLink

Home Search

Comprehensive Stormwater Management Plan Northeast Lino Lakes Drainage Improvement Project WSB Project No. 2929-79 Page 13 INFOSWMM NODE RCWD 2014 INVERT ELEV RCWD 2014 INITIAL WSEL ELEV. REVISED INVERT ELEV REVISED INITIAL WSEL ELEV. JMT_004 883.25 886.11 883.25 886.11 JMT_005 883.64 886.114 883.64 886.114 JMT_006 884.49 886.357 884.49 886.357 Finally, the inflow hydrograph from the URC model node LEAVING_SYSTEM2 was input at junction node JM_016 in the HWC model as ACD72_LEAVE2_100YR. The HWC model was re-run and the total inflow hydrograph at junction JMT_001 was exported from InfoSWMM and imported into the existing conditions HEC-RAS model at RS 125004.6. Table 3-7. Hardwood Creek Model Outflow Summary [cfs] HWC NODE 2-YR 24-HR 10-YR 24-HR 100-YR 24-HR 100-YR 10-DAY JMT_001 RCWD 2014 80.7 202.5 685.6 932.0 Revised Existing 99.8 214.3 669.3 903.2 Difference [cfs] 19.1 11.7 -16.3 -28.8 3.5 Rice Creek HEC-RAS The existing conditions HEC-RAS model was updated with the inflow hydrographs from all the InfoSWMM models and re-run to establish the existing water surface elevations in Peltier Lake for the CSMP study and the results are summarized in Table 3-8. Table 3-8. Peltier Lake Stage Summary [ft] 2-YR 24-HR 10-YR 24-HR 100-YR 24-HR 100-YR 10-DAY PELTIER LAKE STAGE RCWD 2014 885.73 886.28 887.20 887.53 REVISED EXISTING 885.76 886.41 887.22 887.51 DIFFERENCE [FT] 0.03 0.13 0.02 -0.02 Due to the relatively minor changes in stage at Peltier Lake, it was assumed that re-importing the stage hydrograph into the InfoSWMM models would result in negligible changes to the overall InfoSWMM results. As a result, the Peltier Lake stage data was not updated in the revised existing conditions InfoSWMM modeling and the models presented above were used as the baseline existing conditions. Detailed input and result tables from the existing conditions modeling may be found in Appendix B.