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Home My WebLink AboutGUARDIAN SELF STORAGE - PDP190020 - - STORMWATER-RELATED DOCUMENTS 7200 South Alton Way, Suite C400 Centennial, CO 80112 303-740-9393 x Fax 303-921-7320 5475 Tech Center Drive, Suite 235 Colorado Springs, CO 80919 719-593-2593 x Fax 303-921-7320 2900 South College Avenue, Suite 3D Fort Collins, CO 80525 970-491-9888 x Fax 303-921-7320 TECHNICAL MEMORANDUM To:Kevin Cohen, Guardian Storage Fort Collins LLC From:Rebecca Brush, PE Date:February 13, 2020 Subject: Guardian Storage Fort Collins – No Rise Certification Introduction – Purpose and Intent The Guardian Storage project is located on the northeast corner of College Avenue and Fossil Creek Parkway. The proposed development will include the self-storage building, associated drives and parking, as well as the completion of Snead Drive east of the proposed building, from the northern property line to Fossil Creek Parkway at the southeast corner of the site. The proposed development will require work within the Fossil Creek floodplain and floodway and is subject to the requirements of Chapter 10 of the Fort Collins Municipal Code (Chapter 10). Please refer to the attached applicable exhibits for the project, which accompany the Floodplain Use Permit and the No Rise documentation. Applicable Floodplain Ordinance The following sections of Chapter 10 apply to this project: • Section 10-16 – all filling, excavation, grading, or paving operations in the floodway are considered development; • Section 10-27 – development work must be preceded by an approved floodplain use permit, no-rise certification, and supporting documentation; • Section 10-45 – no-rise criteria will be satisfied with appropriate certifications and documentation by a registered P.E. and/or P.L.S.; • Section 10-105 – all non-structural development in a floodway is subject to the no-rise requirements of Section 10-45; • Section 10-105 (5) – outdoor storage of equipment or materials in a floodway is prohibited. Certification Standards and Conditions The attached floodplain exhibit shows that the entire development or disturbed area is within the ineffective flow area and will therefore result in no-rise to the Base Flood Elevation (BFE). A HEC-RAS model of the proposed development was also completed to show no-rise to the effective BFE. A Duplicate Effective (DE) model was created from the Fossil Creek model provided by the City of Fort Collins. The DE model matches 7200 South Alton Way, Suite C400 Centennial, CO 80112 303-740-9393 x Fax 303-921-7320 5475 Tech Center Drive, Suite 235 Colorado Springs, CO 80919 719-593-2593 x Fax 303-921-7320 2900 South College Avenue, Suite 3D Fort Collins, CO 80525 970-491-9888 x Fax 303-921-7320 the City of Fort Collins Fossil Creek model but is trimmed down to include only the necessary sections and is used as a base for result comparison. From the DE model a Revised Conditions (RC) model was created which shows the proposed conditions of the development site by revising the associated cross sections (29946, 29876, 29682, 29672, and 29499). The revised conditions model shows no change in any water surface elevation as compared to the DE model. The results and maps are attached. Compliance and Recertification The proposed Guardian Storage development is subject to the recommended condition of approval and satisfies the standards of the following sections of Chapter 10. • Section 10-16 – development; the proposed work is acknowledged herein as floodway development • Section 10-27 –permit, certification, and supporting documentation; this document and attachments as well as the floodplain use permit satisfy this requirement. • Section 10-45 – no-rise; certified by attached documents, design standards, and the certification standards section of this document. • Section 10-105 –non-structural development in a floodway; construction debris will not be deposited in or near the floodway. • Section 10-105 (5) – outdoor storage in a floodway; There will be no construction equipment or materials stored overnight within the boundaries of the floodway during this work. Conclusion Since the entirety of the proposed development is within the ineffective flow area of the Fossil Creek floodplain and the HEC-RAS analysis provided shows that any grading or disturbance from the proposed development will result in no-rise to the Base Flood Elevation (BFE). Please feel free to contact me at rbrush@jrengineering.com or 303-267-6189 if you have any questions or comments. 30177 29946 29682 29499 29262 HEC-RAS Plan: DE_Bridges River: Fossil Creek Reach: Reach 1 Reach River Sta Profile Q Total Min Ch El W.S. Elev Crit W.S.E.G. Elev E.G. Slope Vel Chnl Flow Area Top Width Froude # Chl (cfs)(ft)(ft)(ft)(ft)(ft/ft)(ft/s)(sq ft)(ft) Reach 1 30177 2-Year 244.00 4940.57 4945.16 4942.29 4945.26 0.000731 2.48 98.33 49.26 0.21 Reach 1 30177 5-Year 766.00 4940.57 4946.82 4944.10 4946.97 0.000926 3.06 250.35 54.50 0.24 Reach 1 30177 10-Year 1124.00 4940.57 4947.64 4945.07 4947.87 0.001202 3.84 292.73 56.70 0.28 Reach 1 30177 50-Year 2268.00 4940.57 4950.16 4945.87 4950.61 0.001512 5.37 422.39 385.13 0.33 Reach 1 30177 100-Year 3484.00 4940.57 4953.40 4947.22 4953.94 0.001230 5.89 591.20 602.24 0.31 Reach 1 30062.5 Culvert Reach 1 29946 2-Year 244.00 4940.30 4945.10 4942.58 4945.22 0.002102 2.72 89.78 45.00 0.25 Reach 1 29946 5-Year 766.00 4940.30 4946.48 4944.52 4946.65 0.002541 3.29 238.80 63.18 0.26 Reach 1 29946 10-Year 1124.00 4940.30 4946.99 4945.31 4947.27 0.003828 4.30 271.80 67.82 0.32 Reach 1 29946 50-Year 2268.00 4940.30 4948.06 4945.71 4948.74 0.007526 6.79 353.88 128.23 0.47 Reach 1 29946 100-Year 3484.00 4940.30 4948.83 4947.63 4949.97 0.010985 8.83 414.02 143.23 0.57 Reach 1 29876 2-Year 244.00 4941.01 4945.03 4942.76 4945.07 0.000873 1.80 143.47 65.62 0.18 Reach 1 29876 5-Year 766.00 4941.01 4946.34 4944.37 4946.49 0.001795 3.24 250.64 105.50 0.27 Reach 1 29876 10-Year 1124.00 4941.01 4946.77 4944.95 4947.03 0.002527 4.08 294.37 138.64 0.32 Reach 1 29876 50-Year 2268.00 4941.01 4947.71 4946.32 4948.24 0.004155 5.87 423.22 275.04 0.42 Reach 1 29876 100-Year 3484.00 4941.01 4948.37 4947.59 4949.18 0.005489 7.23 517.90 318.96 0.50 Reach 1 29682 2-Year 244.00 4940.22 4944.86 4941.95 4944.90 0.000810 1.68 146.71 62.73 0.17 Reach 1 29682 5-Year 766.00 4940.22 4945.89 4943.39 4946.05 0.002590 3.44 270.38 245.02 0.31 Reach 1 29682 10-Year 1124.00 4940.22 4946.19 4944.22 4946.41 0.003404 4.14 349.34 275.78 0.36 Reach 1 29682 50-Year 2268.00 4940.22 4946.94 4946.42 4947.23 0.004166 5.12 569.38 310.06 0.41 Reach 1 29682 100-Year 3484.00 4940.22 4947.54 4946.87 4947.90 0.004350 5.65 768.05 340.11 0.42 Reach 1 29677.5 Inl Struct Reach 1 29672 2-Year 244.00 4936.69 4941.18 4938.83 4941.28 0.002816 2.54 96.17 36.04 0.27 Reach 1 29672 5-Year 766.00 4936.69 4943.28 4940.86 4943.55 0.004435 4.14 184.99 46.54 0.37 Reach 1 29672 10-Year 1124.00 4936.69 4944.00 4941.74 4944.40 0.006513 5.08 221.42 55.17 0.45 Reach 1 29672 50-Year 2268.00 4936.69 4945.35 4943.64 4946.21 0.011768 7.47 305.83 76.31 0.62 Reach 1 29672 100-Year 3484.00 4936.69 4946.31 4945.25 4947.22 0.011263 8.12 510.08 278.54 0.62 Reach 1 29499 2-Year 244.00 4935.82 4940.70 4938.60 4940.78 0.002913 2.38 102.32 43.70 0.27 Reach 1 29499 5-Year 766.00 4935.82 4942.77 4940.44 4942.90 0.002731 3.05 270.49 117.63 0.29 Reach 1 29499 10-Year 1124.00 4935.82 4943.45 4941.24 4943.61 0.002681 3.40 357.83 142.96 0.29 Reach 1 29499 50-Year 2268.00 4935.82 4944.78 4942.83 4945.03 0.002988 4.31 572.33 248.29 0.32 Reach 1 29499 100-Year 3484.00 4935.82 4945.61 4943.67 4945.95 0.003594 5.19 786.66 424.73 0.36 Reach 1 29262 2-Year 244.00 4936.35 4939.95 4938.55 4940.04 0.003406 2.38 102.45 51.48 0.30 Reach 1 29262 5-Year 766.00 4936.35 4942.02 4939.83 4942.17 0.003748 3.07 250.39 101.76 0.33 Reach 1 29262 10-Year 1124.00 4936.35 4942.73 4940.54 4942.91 0.003556 3.49 332.38 164.86 0.33 Reach 1 29262 50-Year 2268.00 4936.35 4943.99 4942.02 4944.28 0.003931 4.53 568.15 523.50 0.37 Reach 1 29262 100-Year 3484.00 4936.35 4944.74 4943.00 4945.10 0.004343 5.26 779.53 643.14 0.40 Reach 1 29223 2-Year 244.00 4934.50 4939.93 4936.41 4939.99 0.000390 2.02 123.57 37.76 0.17 Reach 1 29223 5-Year 766.00 4934.50 4941.84 4938.45 4942.08 0.000965 4.08 232.90 108.65 0.29 Reach 1 29223 10-Year 1124.00 4934.50 4942.44 4939.43 4942.80 0.001329 5.10 313.77 160.86 0.35 Reach 1 29223 50-Year 2268.00 4934.50 4942.55 4942.53 4943.90 0.004965 9.97 331.97 170.42 0.68 Reach 1 29223 100-Year 3484.00 4934.50 4944.04 4943.19 4944.87 0.003144 9.06 801.80 777.48 0.56 0 200 400 600 800 1000 4940 4945 4950 4955 4960 FossilCreek Plan: DE_Fossil Creek Floodplains_ Bridges 2/13/2020 RS = 30177 U/S College Avenue King Survey Data STA 585.85 - 939.12 Station (ft)Elevation (ft)Legend EG 100-Year WS 100-Year EG 50-Year WS 50-Year EG 10-Year WS 10-Year Crit 100-Year EG 5-Year WS 5-Year Crit 50-Year EG 2-Year WS 2-Year Crit 10-Year Crit 5-Year Crit 2-Year Ground Ineff Bank Sta .035 . 0 3 5 . 0 4 0 200 400 600 800 1000 4940 4945 4950 4955 4960 4965 FossilCreek Plan: DE_Fossil Creek Floodplains_ Bridges 2/13/2020 RS = 30062.5 Culv College Avenue - Downstream culvert inverts based on measuredown Station (ft)Elevation (ft)Legend EG 100-Year WS 100-Year EG 50-Year WS 50-Year Crit 100-Year EG 10-Year WS 10-Year EG 5-Year Crit 50-Year WS 5-Year EG 2-Year WS 2-Year Crit 10-Year Crit 5-Year Crit 2-Year Ground Ineff Bank Sta .035 . 0 3 5 . 0 4 0 200 400 600 800 1000 1200 4940 4945 4950 4955 4960 4965 4970 FossilCreek Plan: DE_Fossil Creek Floodplains_ Bridges 2/13/2020 RS = 30062.5 Culv College Avenue - Downstream culvert inverts based on measuredown Station (ft)Elevation (ft)Legend EG 100-Year EG 50-Year WS 100-Year WS 50-Year Crit 100-Year EG 10-Year WS 10-Year EG 5-Year WS 5-Year Crit 50-Year EG 2-Year WS 2-Year Crit 10-Year Crit 5-Year Crit 2-Year Ground Ineff Bank Sta .035 . 0 5 2 .04 0 200 400 600 800 1000 1200 4940 4945 4950 4955 4960 4965 FossilCreek Plan: DE_Fossil Creek Floodplains_ Bridges 2/13/2020 RS = 29946 D/S College Avenue King Survey Data STA 856.34 - 913.76 Station (ft)Elevation (ft)Legend EG 100-Year WS 100-Year EG 50-Year WS 50-Year Crit 100-Year EG 10-Year WS 10-Year EG 5-Year WS 5-Year Crit 50-Year Crit 10-Year EG 2-Year WS 2-Year Crit 5-Year Crit 2-Year Ground Ineff Bank Sta .035 . 0 5 2 .04 0 200 400 600 800 1000 1200 4940 4945 4950 4955 4960 FossilCreek Plan: DE_Fossil Creek Floodplains_ Bridges 2/13/2020 RS = 29876 King Survey Data STA 716.57 - 856.1 Station (ft)Elevation (ft)Legend EG 100-Year WS 100-Year EG 50-Year WS 50-Year Crit 100-Year EG 10-Year WS 10-Year EG 5-Year WS 5-Year Crit 50-Year EG 2-Year WS 2-Year Crit 10-Year Crit 5-Year Crit 2-Year Ground Ineff Bank Sta .035 . 0 5 2 .04 0 200 400 600 800 1000 4940 4945 4950 4955 4960 4965 FossilCreek Plan: DE_Fossil Creek Floodplains_ Bridges 2/13/2020 RS = 29682 Top of Grade Control Structure. King Survey Data STA 409.54 - Station (ft)Elevation (ft)Legend EG 100-Year WS 100-Year EG 50-Year WS 50-Year Crit 100-Year Crit 50-Year EG 10-Year WS 10-Year EG 5-Year WS 5-Year EG 2-Year WS 2-Year Crit 10-Year Crit 5-Year Crit 2-Year Ground Ineff Bank Sta .035 . 0 5 2 .04 0 200 400 600 800 1000 4940 4945 4950 4955 4960 4965 FossilCreek Plan: DE_Fossil Creek Floodplains_ Bridges 2/13/2020 RS = 29677.5 IS Irrigation Diversion Structure Station (ft)Elevation (ft)Legend EG 100-Year WS 100-Year EG 50-Year WS 50-Year EG 10-Year WS 10-Year EG 5-Year WS 5-Year EG 2-Year WS 2-Year Ground Ineff Bank Sta .035 . 0 5 2 .04 0 200 400 600 800 1000 4935 4940 4945 4950 4955 4960 4965 FossilCreek Plan: DE_Fossil Creek Floodplains_ Bridges 2/13/2020 RS = 29672 Bottom of Grade Control Structure. King Survey Data STA 425 - Station (ft)Elevation (ft)Legend EG 100-Year WS 100-Year EG 50-Year WS 50-Year Crit 100-Year EG 10-Year WS 10-Year Crit 50-Year EG 5-Year WS 5-Year Crit 10-Year EG 2-Year WS 2-Year Crit 5-Year Crit 2-Year Ground Ineff Bank Sta .035 . 0 5 7 .04 0 200 400 600 800 1000 4934 4936 4938 4940 4942 4944 4946 4948 4950 4952 FossilCreek Plan: DE_Fossil Creek Floodplains_ Bridges 2/13/2020 RS = 29499 King Survey Data STA 521.61 - 610.14 Station (ft)Elevation (ft)Legend EG 100-Year WS 100-Year EG 50-Year WS 50-Year Crit 100-Year EG 10-Year WS 10-Year EG 5-Year Crit 50-Year WS 5-Year Crit 10-Year EG 2-Year WS 2-Year Crit 5-Year Crit 2-Year Ground Ineff Bank Sta .035 . 0 5 7 .04 0 200 400 600 800 1000 1200 4936 4938 4940 4942 4944 4946 4948 4950 4952 FossilCreek Plan: DE_Fossil Creek Floodplains_ Bridges 2/13/2020 RS = 29262 Station (ft)Elevation (ft)Legend EG 100-Year WS 100-Year EG 50-Year WS 50-Year Crit 100-Year EG 10-Year WS 10-Year EG 5-Year Crit 50-Year WS 5-Year Crit 10-Year EG 2-Year WS 2-Year Crit 5-Year Crit 2-Year Ground Ineff Bank Sta .035 . 0 5 7 .04 1000 1200 1400 1600 1800 2000 2200 4934 4936 4938 4940 4942 4944 4946 4948 FossilCreek Plan: DE_Fossil Creek Floodplains_ Bridges 2/13/2020 RS = 29223 DOWNSTREAM STUDY LIMIT FOR FOSSIL CREEK DRIVE TRAIL - Effective Station (ft)Elevation (ft)Legend EG 100-Year WS 100-Year EG 50-Year Crit 100-Year EG 10-Year WS 50-Year Crit 50-Year WS 10-Year EG 5-Year WS 5-Year EG 2-Year WS 2-Year Crit 10-Year Crit 5-Year Crit 2-Year Ground Ineff Bank Sta .045 . 0 3 5 .045 HEC-RAS Plan: RC River: Fossil Creek Reach: Reach 1 Reach River Sta Profile Q Total Min Ch El W.S. Elev Crit W.S.E.G. Elev E.G. Slope Vel Chnl Flow Area Top Width Froude # Chl (cfs)(ft)(ft)(ft)(ft)(ft/ft)(ft/s)(sq ft)(ft) Reach 1 30177 2-Year 244.00 4940.57 4945.16 4942.29 4945.26 0.000731 2.48 98.33 49.26 0.21 Reach 1 30177 5-Year 766.00 4940.57 4946.82 4944.10 4946.97 0.000926 3.06 250.35 54.50 0.24 Reach 1 30177 10-Year 1124.00 4940.57 4947.64 4945.07 4947.87 0.001202 3.84 292.73 56.70 0.28 Reach 1 30177 50-Year 2268.00 4940.57 4950.16 4945.87 4950.61 0.001512 5.37 422.39 385.13 0.33 Reach 1 30177 100-Year 3484.00 4940.57 4953.40 4947.22 4953.94 0.001230 5.89 591.20 602.24 0.31 Reach 1 30062.5 Culvert Reach 1 29946 2-Year 244.00 4940.30 4945.10 4942.58 4945.22 0.002102 2.72 89.78 45.00 0.25 Reach 1 29946 5-Year 766.00 4940.30 4946.48 4944.52 4946.65 0.002541 3.29 238.80 63.18 0.26 Reach 1 29946 10-Year 1124.00 4940.30 4946.99 4945.31 4947.27 0.003828 4.30 271.80 67.82 0.32 Reach 1 29946 50-Year 2268.00 4940.30 4948.06 4945.71 4948.74 0.007526 6.79 353.88 128.23 0.47 Reach 1 29946 100-Year 3484.00 4940.30 4948.83 4947.63 4949.97 0.010985 8.83 414.02 143.23 0.57 Reach 1 29876 2-Year 244.00 4941.01 4945.03 4942.76 4945.07 0.000873 1.80 143.47 65.62 0.18 Reach 1 29876 5-Year 766.00 4941.01 4946.34 4944.37 4946.49 0.001795 3.24 250.64 105.50 0.27 Reach 1 29876 10-Year 1124.00 4941.01 4946.77 4944.95 4947.03 0.002527 4.08 294.37 138.64 0.32 Reach 1 29876 50-Year 2268.00 4941.01 4947.71 4946.32 4948.24 0.004155 5.87 423.22 275.04 0.42 Reach 1 29876 100-Year 3484.00 4941.01 4948.37 4947.59 4949.18 0.005489 7.23 517.90 318.96 0.50 Reach 1 29682 2-Year 244.00 4940.22 4944.86 4941.95 4944.90 0.000810 1.68 146.71 62.73 0.17 Reach 1 29682 5-Year 766.00 4940.22 4945.89 4943.39 4946.05 0.002590 3.44 270.38 245.02 0.31 Reach 1 29682 10-Year 1124.00 4940.22 4946.19 4944.22 4946.41 0.003404 4.14 349.34 275.78 0.36 Reach 1 29682 50-Year 2268.00 4940.22 4946.94 4946.42 4947.23 0.004166 5.12 569.38 310.06 0.41 Reach 1 29682 100-Year 3484.00 4940.22 4947.54 4946.87 4947.90 0.004350 5.65 768.05 340.11 0.42 Reach 1 29677.5 Inl Struct Reach 1 29672 2-Year 244.00 4936.69 4941.18 4938.83 4941.28 0.002816 2.54 96.17 36.04 0.27 Reach 1 29672 5-Year 766.00 4936.69 4943.28 4940.86 4943.55 0.004435 4.14 184.99 46.54 0.37 Reach 1 29672 10-Year 1124.00 4936.69 4944.00 4941.74 4944.40 0.006513 5.08 221.42 55.17 0.45 Reach 1 29672 50-Year 2268.00 4936.69 4945.35 4943.64 4946.21 0.011768 7.47 305.83 76.31 0.62 Reach 1 29672 100-Year 3484.00 4936.69 4946.31 4945.25 4947.22 0.011263 8.12 510.08 278.54 0.62 Reach 1 29499 2-Year 244.00 4935.82 4940.70 4938.60 4940.78 0.002913 2.38 102.32 43.70 0.27 Reach 1 29499 5-Year 766.00 4935.82 4942.77 4940.44 4942.90 0.002731 3.05 270.49 117.63 0.29 Reach 1 29499 10-Year 1124.00 4935.82 4943.45 4941.24 4943.61 0.002681 3.40 357.83 142.96 0.29 Reach 1 29499 50-Year 2268.00 4935.82 4944.78 4942.83 4945.03 0.002988 4.31 572.33 198.32 0.32 Reach 1 29499 100-Year 3484.00 4935.82 4945.61 4943.67 4945.95 0.003594 5.19 786.66 378.50 0.36 Reach 1 29262 2-Year 244.00 4936.35 4939.95 4938.55 4940.04 0.003406 2.38 102.45 51.48 0.30 Reach 1 29262 5-Year 766.00 4936.35 4942.02 4939.83 4942.17 0.003748 3.07 250.39 101.76 0.33 Reach 1 29262 10-Year 1124.00 4936.35 4942.73 4940.54 4942.91 0.003556 3.49 332.38 164.86 0.33 Reach 1 29262 50-Year 2268.00 4936.35 4943.99 4942.02 4944.28 0.003931 4.53 568.15 523.50 0.37 Reach 1 29262 100-Year 3484.00 4936.35 4944.74 4943.00 4945.10 0.004343 5.26 779.53 643.14 0.40 Reach 1 29223 2-Year 244.00 4934.50 4939.93 4936.41 4939.99 0.000390 2.02 123.57 37.76 0.17 Reach 1 29223 5-Year 766.00 4934.50 4941.84 4938.45 4942.08 0.000965 4.08 232.90 108.65 0.29 Reach 1 29223 10-Year 1124.00 4934.50 4942.44 4939.43 4942.80 0.001329 5.10 313.77 160.86 0.35 Reach 1 29223 50-Year 2268.00 4934.50 4942.55 4942.53 4943.90 0.004965 9.97 331.97 170.42 0.68 Reach 1 29223 100-Year 3484.00 4934.50 4944.04 4943.19 4944.87 0.003144 9.06 801.80 777.48 0.56 0 200 400 600 800 1000 4940 4945 4950 4955 4960 FossilCreek Plan: RC_Fossil Creek Floodplains_ Bridges 2/13/2020 RS = 30177 U/S College Avenue King Survey Data STA 585.85 - 939.12 Station (ft)Elevation (ft)Legend EG 100-Year WS 100-Year EG 50-Year WS 50-Year EG 10-Year WS 10-Year Crit 100-Year EG 5-Year WS 5-Year Crit 50-Year EG 2-Year WS 2-Year Crit 10-Year Crit 5-Year Crit 2-Year Ground Ineff Bank Sta .035 . 0 3 5 . 0 4 0 200 400 600 800 1000 4940 4945 4950 4955 4960 4965 FossilCreek Plan: RC_Fossil Creek Floodplains_ Bridges 2/13/2020 RS = 30062.5 Culv College Avenue - Downstream culvert inverts based on measuredown Station (ft)Elevation (ft)Legend EG 100-Year WS 100-Year EG 50-Year WS 50-Year Crit 100-Year EG 10-Year WS 10-Year EG 5-Year Crit 50-Year WS 5-Year EG 2-Year WS 2-Year Crit 10-Year Crit 5-Year Crit 2-Year Ground Ineff Bank Sta .035 . 0 3 5 . 0 4 0 200 400 600 800 1000 1200 4940 4945 4950 4955 4960 4965 4970 FossilCreek Plan: RC_Fossil Creek Floodplains_ Bridges 2/13/2020 RS = 30062.5 Culv College Avenue - Downstream culvert inverts based on measuredown Station (ft)Elevation (ft)Legend EG 100-Year EG 50-Year WS 100-Year WS 50-Year Crit 100-Year EG 10-Year WS 10-Year EG 5-Year WS 5-Year Crit 50-Year EG 2-Year WS 2-Year Crit 10-Year Crit 5-Year Crit 2-Year Ground Ineff Bank Sta .035 . 0 5 2 .04 0 200 400 600 800 1000 1200 4940 4945 4950 4955 4960 4965 FossilCreek Plan: RC_Fossil Creek Floodplains_ Bridges 2/13/2020 RS = 29946 D/S College Avenue King Survey Data STA 856.34 - 913.76 Station (ft)Elevation (ft)Legend EG 100-Year WS 100-Year EG 50-Year WS 50-Year Crit 100-Year EG 10-Year WS 10-Year EG 5-Year WS 5-Year Crit 50-Year Crit 10-Year EG 2-Year WS 2-Year Crit 5-Year Crit 2-Year Ground Ineff Bank Sta .035 . 0 5 2 .04 0 200 400 600 800 1000 1200 4940 4945 4950 4955 4960 FossilCreek Plan: RC_Fossil Creek Floodplains_ Bridges 2/13/2020 RS = 29876 King Survey Data STA 716.57 - 856.1 Station (ft)Elevation (ft)Legend EG 100-Year WS 100-Year EG 50-Year WS 50-Year Crit 100-Year EG 10-Year WS 10-Year EG 5-Year WS 5-Year Crit 50-Year EG 2-Year WS 2-Year Crit 10-Year Crit 5-Year Crit 2-Year Ground Ineff Bank Sta .035 . 0 5 2 .04 0 200 400 600 800 1000 4940 4945 4950 4955 4960 4965 FossilCreek Plan: RC_Fossil Creek Floodplains_ Bridges 2/13/2020 RS = 29682 Top of Grade Control Structure. King Survey Data STA 409.54 - Station (ft)Elevation (ft)Legend EG 100-Year WS 100-Year EG 50-Year WS 50-Year Crit 100-Year Crit 50-Year EG 10-Year WS 10-Year EG 5-Year WS 5-Year EG 2-Year WS 2-Year Crit 10-Year Crit 5-Year Crit 2-Year Ground Ineff Bank Sta .035 . 0 5 2 .04 0 200 400 600 800 1000 4940 4945 4950 4955 4960 4965 FossilCreek Plan: RC_Fossil Creek Floodplains_ Bridges 2/13/2020 RS = 29677.5 IS Irrigation Diversion Structure Station (ft)Elevation (ft)Legend EG 100-Year WS 100-Year EG 50-Year WS 50-Year EG 10-Year WS 10-Year EG 5-Year WS 5-Year EG 2-Year WS 2-Year Ground Ineff Bank Sta .035 . 0 5 2 .04 0 200 400 600 800 1000 4935 4940 4945 4950 4955 4960 4965 FossilCreek Plan: RC_Fossil Creek Floodplains_ Bridges 2/13/2020 RS = 29672 Bottom of Grade Control Structure. King Survey Data STA 425 - Station (ft)Elevation (ft)Legend EG 100-Year WS 100-Year EG 50-Year WS 50-Year Crit 100-Year EG 10-Year WS 10-Year Crit 50-Year EG 5-Year WS 5-Year Crit 10-Year EG 2-Year WS 2-Year Crit 5-Year Crit 2-Year Ground Ineff Bank Sta .035 . 0 5 7 .04 0 200 400 600 800 1000 4935 4940 4945 4950 4955 4960 FossilCreek Plan: RC_Fossil Creek Floodplains_ Bridges 2/13/2020 RS = 29499 King Survey Data STA 521.61 - 610.14 Station (ft)Elevation (ft)Legend EG 100-Year WS 100-Year EG 50-Year WS 50-Year Crit 100-Year EG 10-Year WS 10-Year EG 5-Year Crit 50-Year WS 5-Year Crit 10-Year EG 2-Year WS 2-Year Crit 5-Year Crit 2-Year Ground Ineff Bank Sta .035 . 0 5 7 .04 0 200 400 600 800 1000 1200 4936 4938 4940 4942 4944 4946 4948 4950 4952 FossilCreek Plan: RC_Fossil Creek Floodplains_ Bridges 2/13/2020 RS = 29262 Station (ft)Elevation (ft)Legend EG 100-Year WS 100-Year EG 50-Year WS 50-Year Crit 100-Year EG 10-Year WS 10-Year EG 5-Year Crit 50-Year WS 5-Year Crit 10-Year EG 2-Year WS 2-Year Crit 5-Year Crit 2-Year Ground Ineff Bank Sta .035 . 0 5 7 .04 1000 1200 1400 1600 1800 2000 2200 4934 4936 4938 4940 4942 4944 4946 4948 FossilCreek Plan: RC_Fossil Creek Floodplains_ Bridges 2/13/2020 RS = 29223 DOWNSTREAM STUDY LIMIT FOR FOSSIL CREEK DRIVE TRAIL - Effective Station (ft)Elevation (ft)Legend EG 100-Year WS 100-Year EG 50-Year Crit 100-Year EG 10-Year WS 50-Year Crit 50-Year WS 10-Year EG 5-Year WS 5-Year EG 2-Year WS 2-Year Crit 10-Year Crit 5-Year Crit 2-Year Ground Ineff Bank Sta .045 . 0 3 5 .045 A Westrian CompanyCity of Fort Collins, Colorado UTILITY PLAN APPROVAL DateCity Engineer DateWater & Wastewater Utility DateStormwater Utility DateParks & Recreation DateTraffic Engineer Date DateEnvironmental Planner Date 29,825 GSF EEE E E X:\3970000.all\3973701\Drawings\Sheet Dwgs\Prel PDP- Utility Plans\3973701FP01-C.dwg, FLOODPLAIN PLAN, 2/13/2020 3:48:44 PM, FC