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Home My WebLink AboutDrainage Reports - 11/09/2023C � z i2 Consultants, Inc. � October 17, 2023 Mr. Dan Mogen Development Review Engineer City of Fort Collins Utilities 222 Laporte Avenue Fort Collins, CO 80524 16911 Potts Place, Mead, CO 970.2D.9148 troy@i2-consultants.com City of Fort Collins Approved Plans Approved by: Dan Mogen Date: 11/09/2023 RE: Drainage Letter for the Harmony House Building Addition 3105 E. Harmony Road, Fort Collins, CO Dear Mr. Mogen: We are pleased to present this Drainage Letter for the Harmony House Building Addition for your review and approval. The subject property is located at 3105 E. Harmony Road, Fort Collins, CO. This report has been prepared in general accordance with the Fort Collins Stormwater Criteria Manual, September 2018. INTRODUCTION The subject property is located in the Northwest Quarter of Section 4, Township 6 North, Range 68 West, of the Sixth Principal Meridian, City of Fort Collins, County of Larimer, State of Colorado. The legal description of the subject property is: Lot 2, Harmony Technology Park, First Filing. Lot 2 contains +/-0.99 acres. The studv area for this project is 0.2 acres. The project is in general compliance with the Final Drainage and Project Development for the Harmony Technology Park First Filing, prepared by Sear Brown, dated January 1998. The project will consist of a building addition to the southern portion of the existing building. A small portion of the existing building/covered patio will be removed. A concrete patio will be added as well as a wood deck along the western side of the building addition. Furthermore, a concrete access will be added along the eastern side of the building addition. The improvements to the site will also include a new playground and landscaping. The existing access and parking will not be revised or modified with this project. EXISTING CONDITIONS The subject property currently contains one (1) building, three (3) sheds, concrete walks, a playground, seating area, accesses, parking and landscaping. The accesses and parking c i 2 � Drainage Letter for the Harmony House Building Addition, 3105 E. Harmony Road, Fort Collins October 17, 2023 will not be revised or modified with this project. According to the Drainage and Erosion Control Plan included in the Final Drainage and Project Development for the Harmony Technology Park First Filing, the subject site is located in Basin 6. This basin flows inward towards an existing 15' Type R inlet. Runoff is then conveyed via 29"X45" HERCP to Pond A(existing detention pond), located in the southeastern portion of Harmony Technology Park First Filing. The existing subject site drains in multiple directions. Based on existing topography, the northern portion of the site is relatively flat. The access and parking generally flow from north to south through the existing access to the property to the south. This runoff reaches existing curb and gutter and is conveyed to the west to an existing 15' Type R inlet installed with the First Filing improvements. Furthermore, the southern portion of Lot 2 (generally the study area) drains from north to south and also reaches the existing curb and gutter on the property to the south and eventually the existing 15' Type R inlet. There is an existing 30' Drainage, Access and Utility Easement located south of the subject site that conveys runoff for the subject property. The existing onsite imperviousness within the study area is roughly 25%. This takes into account a portion of the existing building, concrete areas, gravel seating areas, a playground and existing landscaping. The calculated runoff for the study area is 0.2 cfs for the minor (2-year) storm event and 0.92 cfs for the major (100-year) storm event. Please refer to the Appendix for hydrologic calculations as well as an exhibit for existing conditions. PROPOSED CONDITIONS The proposed improvements will include a building addition (roughly 2,500 sf), a concrete patio and walk, playground and landscaping. The accesses and parking will not be revised or modified with this project. The project will also include removal and replacement of landscaping as required for the proposed improvements. Runoff will generally continue to flow in the historic pattern. Runoff will drain from north to south, to the existing curb and gutter located south of Lot 2. The proposed runoff will flow through landscaping prior to reaching the existing curb and gutter. The proposed onsite imperviousness has been calculated to be approximately 39%. The overall impervious increase is minor considering the entire Lot 2 area. The calculated runoff for the study area is 0.26 cfs for the minor (2-year) storm event and 1.22 cfs for the major (100-year) storm event. The increase in runoff between the existing and proposed conditions is 0.06 cfs for the minor (2-year) storm event and 0.3 cfs for the major (100-year) event. The increase in runoff will not have a significant impact on the existing curb and gutter south of the project or the existing storm system installed with Harmony Technology Park First Filing improvements (described above). c 2 i 2 � Drainage Letter for the Harmony House Building Addition, 3105 E. Harmony Road, Fort Collins October 17, 2023 The net increase in impervious area is roughly 716 s.f. from the existing condition to the proposed condition with this project. Detention and water quality are not provided for this project as the net increase in impervious area is less than 1,000 s.f. Please refer to the Appendix for additional information. Additionally, LID (low impact development) measures have not been added to this project as it is being processed as a Minor Amendment through the City of Fort Collins. CONCLUSIONS The proposed site improvements for the study area are not expected to have a negative impact on downstream conveyances. Furthermore, the existing drainage patterns have been maintained with this proposed project development. Upon completion of the project, the study area drainage will continue to flow off-site to the south in the historic pattern to the existing improvements installed with Harmony Technology Park First Filing. c i 2 � Drainage Letter for the Harmony House Building Addition, 3105 E. Harmony Road, Fort Collins October 17, 2023 APPENDIX This compliance letter includes the following in the Appendix: � Existing Geotechnical Information • Impervious/Runoff Calculations • Drainage Plan • Impervious Area Exhibit � Excerpt from Addendum to the Final Drainage and Erosion Control Study for Harmony Technology Park First Filing, prepared by Sear Brown We look forward to your favorable review of this project and report. Please do not hesitate to contact our office if you have any questions. Sincerely, i2 Consultants, Inc. ;;_:,, ' �r�� '�ril'�� , Troy W. Campbell, PE Senior Project Engineer ENGINEER'S CERTIFICATION I hereby certify that this report for the final drainage design of Harmony House Building Addition, 3105 E. Harmony Road, Fort Collins was prepared by me (or under my direct supervision) in accordance with the provisions of the Fort Collins Storm Drainage Criteria Manual. I understand that the City of Fort Collins does not and will not assume liability for drainage facilities designed by others. � �, �� „ ,,:_�� f ,�� : �+1 1'��? : �, � �� !� T',.�`..10/17/2023 :` ,� � Registered Professional Engineer State of Colorado No. 41159 (Seal) C 4 i 2 � APPENDIX � i 2 � � � 0 498450 40° 31' 24" N I � � -- � � �i � � � �- � �- �- � �- 498460 � � � �.. � � � 40° 31' 20" N ' I I I I -I I 498450 498460 498470 4.98480 4984.90 498500 � � Map S�le: 1:547 iF printed on A portait (8.5" x 11") sheet. � N Meters 0 5 10 ZO 30 � � 0 25 50 100 150 Map projection: Web Mercator Comer coordinates: WG584 Edge dcs: UTM Zone 13N WG584 USDn Natural Resources Web Soil Survey � Conservation Service National Cooperative Soil Survey Soil Map—Larimer County Area, Colorado (Harmony House Bui�ding Addition, Ft. Collins, CO) 498470 498480 498490 498500 I � � „ � � � o A-1 498510 498520 4.98530 I .I 40° 31' 24" N � 0{u:LLJL'LI'/�•�•.� — � � � _ ■ _� �i . III � �� a � _ � � �\ �r♦ � : � � -� „ � �� ' �. � _� 0 �� r. � - - � � -� � � � � � 499510 498520 I- 40° 31' 20" N 498530 3 iv 0 4/10/2023 Page 1 of 3 Soil Map—Larimer County Area, Colorado (Harmony House Building Addition, Ft. Collins, CO) MAPLEGEND Area of Interest (AOI) Area of Interest (AOI) Soils Soil Map Unit Polygons . .� Soil Map Unit Lines � Soil Map Unit Points Special Point Features U Blowout ' ` Borrow Pit tt Clay Spot Clased Depression Gravel Pit Gravelly Spot Landfill Lava Flow _ Marsh or swamp Mine or Quarry Miscellaneous Water Perennial Water Rock Outcrop Saline Spot Sandy Spot _ Severely Eroded Spot Sinkhole . Slide or Slip 0o Sodic Spot Spoil Area Stony Spot Very Stony Spot - Wet Spot Other . Special Line Features Water Features Streams and Canals Transportation ,+. Rails ti Interstate Highways US Routes Major Roads Local Roads Background � Aerial Photography MAP INFORMATION The soil surveys that comprise your AOI were mapped at 1:24,000. Warning: Soil Map may not be valid at this scale. Enlargement of maps beyond the scale of mapping can cause misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed scale. Please rely on the bar scale on each map sheet for map measurements. Source of Map: Natural Resources Conservation Service Web Soil Survey URL: Coordinate System: Web Mercator (EPSG:3857) Maps from the Web Soil Survey are based on the Web Mercator projection, which preserves direction and shape but distorts distance and area. A projection that preserves area, such as the Albers equal-area conic projection, should be used if more accurate calculations of distance or area are required. This product is generated from the USDA-NRCS certified data as of the version date(s) listed below. Soil Survey Area: Larimer County Area, Colorado Survey Area Data: Version 17, Sep 7, 2022 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Jul 2, 2021—Aug 25, 2021 The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident. I'V, USDn Natural Resources Web Soil Survey 4/10/2023 � Conservation Service National Cooperative Soil Survey Page 2 of 3 Soil Map—Larimer County Area, Colorado Harmony House Building Addition, Ft. Collins, CO A-3 Map Unit Legend Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI 74 Nunn clay loam, 1 to 3 percent slopes 1.3 100.0% Totals for Area of Interest USDA Natural Resources Web Soil Survey � Conservation Service National Cooperative Soil Survey 1.3 100.0% 4/10/2023 Page 3 of 3 � � 0 498450 40° 31' 24" N I � � � � 0 � � 498460 � Hydrologic Soil Group—Larimer County Area, Colorado � (Harmony House Bui�ding Addition, Ft. Collins, CO) � 0 A-4 498470 498480 498490 498500 498510 498520 4.98530 I I I ,, I I .I 40° 31' 24" N 40° 31' 20" N ' I I I I -I I 498450 498460 498470 4.98480 4984.90 498500 � � Map S�le: 1:547 iF printed on A portait (8.5" x 11") sheet. � N Meters 0 5 10 ZO 30 � � 0 25 50 100 150 Map projection: Web Mercator Comer coordinates: WG584 Edge dcs: UTM Zone 13N WG584 USDn Natural Resources Web Soil Survey � Conservation Service National Cooperative Soil Survey � ��r�''�f� — � �IiL•llilllll'�I �� 1 � � I � � �II 0 � � _ � � �I � I � _ � 0 � � � � � � � � � � 499510 498520 I- 40° 31' 20" N 498530 3 iv 0 4/10/2023 Page 1 of 4 Hydrologic Soil Group—Larimer County Area, Colorado (Harmony House Building Addition, Ft. Collins, CO) MAPLEGEND Area of Interest (AOI) Area of Interest (AOI) Soils Soil Rating Polygons � A � A/D 0 B � B/D 0 C 0 C/D � D � Not rated or not available Soil Rating Lines ;•ti� A o � � C/D Q D � Not rated or not available Water Features Streams and Canals Transportation ,+. Rails ti Interstate Highways US Routes Major Roads Local Roads Background � Aerial Photography ,,�,y A/D N B „y B/D . � C �y C/D ,•�y D .. Not rated or not available Soil Rating Points O A o �o ■ B � s/� MAP INFORMATION The soil surveys that comprise your AOI were mapped at 1:24,000. Warning: Soil Map may not be valid at this scale. Enlargement of maps beyond the scale of mapping can cause misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed scale. Please rely on the bar scale on each map sheet for map measurements. Source of Map: Natural Resources Conservation Service Web Soil Survey URL: Coordinate System: Web Mercator (EPSG:3857) Maps from the Web Soil Survey are based on the Web Mercator projection, which preserves direction and shape but distorts distance and area. A projection that preserves area, such as the Albers equal-area conic projection, should be used if more accurate calculations of distance or area are required. This product is generated from the USDA-NRCS certified data as of the version date(s) listed below. Soil Survey Area: Larimer County Area, Colorado Survey Area Data: Version 17, Sep 7, 2022 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Jul 2, 2021—Aug 25, 2021 The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident. A-5 USDn Natural Resources Web Soil Survey 4/10/2023 � Conservation Service National Cooperative Soil Survey Page 2 of 4 Hydrologic Soil Group—Larimer County Area, Colorado Harmony House Building Addition, Ft. Collins, CO � � Hydrologic Soil Group Map unit symbol Map unit name Rating Acres in AOI Percent of AOI 74 Nunn day loam, 1 to 3 C percent slopes Totals for Area of Interest Description 1.3 1.3 Hydrologic soil groups are based on estimates of runoff potential. Soils are assigned to one of four groups according to the rate of water infiltration when the soils are not protected by vegetation, are thoroughly wet, and receive precipitation from long-duration storms. The soils in the United States are assigned to four groups (A, B, C, and D) and three dual classes (A/D, B/D, and C/D). The groups are defined as follows: Group A. Soils having a high infiltration rate (low runoff potential) when thoroughly wet. These consist mainly of deep, well drained to excessively drained sands or gravelly sands. These soils have a high rate of water transmission. Group B. Soils having a moderate infiltration rate when thoroughly wet. These consist chiefly of moderately deep or deep, moderately well drained or well drained soils that have moderately fine texture to moderately coarse texture. These soils have a moderate rate of water transmission. Group C. Soils having a slow infiltration rate when thoroughly wet. These consist chiefly of soils having a layer that impedes the downward movement of water or soils of moderately fine texture or fine texture. These soils have a slow rate of water transmission. Group D. Soils having a very slow infiltration rate (high runoff potential) when thoroughly wet. These consist chiefly of clays that have a high shrink-swell potential, soils that have a high water table, soils that have a claypan or clay layer at or near the surface, and soils that are shallow over nearly impervious material. These soils have a very slow rate of water transmission. If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is for drained areas and the second is for undrained areas. Only the soils that in their natural condition are in group D are assigned to dual classes. Rating Options Aggregation Method: Dominant Condition Component Percent Cutoff:� None Specified 100.0% 100.0% USDA Natural Resources Web Soil Survey 4/10/2023 � Conservation Service National Cooperative Soil Survey Page 3 of 4 Hydrologic Soil Group—Larimer County Area, Colorado Harmony House Building Addition, Ft. Collins, CO � Tie-break Rule: Higher uSDn Natural Resources Web Soil Survey 4/10/2023 � Conservation Service National Cooperative Soil Survey Page 4 of 4 Runoff Coeffecients Sub-Basins Project: Harmony House Building Addition Location: 3105 E. Harmony Road Fort Collins, CO Project Number:1068-3 Date: 7/19/2023 I� Consultants, Inc. 16911 Potts PIacE. MEad, CO 970.217.9148 troy@i2-consultants.com All calculations presented are based upon the criteria set forth in Citv of Fort Collins Storm Drainaqe Desiqn Criteria 9/1 /2018 Existinq (ac) (sq.ft) (%) Design Point Surface Improvement Area Area C I Comments 1 % of site area Lawns, Sandy soil (flat <2%) 0.13 5456.0 0.15 2.00 61.0°/o Playground 0.03 1308.0 0.50 25.00 14.6% Curb & gutter and walks 0.03 1092.0 0.95 100.00 12.2% Gravel/Deck 0.02 680.0 0.50 40.00 7.6% Roofs 0.01 409.0 0.95 90.00 4.6% Avg. 0.36 24.24 100.0% Total Area 0.21 0.36 24.24 Proposed (ac) (sq.ft) (%) Design Point Surface Improvement Area Area C I Comments 1 % of site area Lawns, Sandy soil (flat <2%) 0.11 4740.0 0.15 2.00 53.0% Playground 0.02 720.0 0.50 25.00 8.0% Curb & gutter and walks 0.02 985.0 0.95 100.00 11.0°/o Gravel/Deck 0.00 0.0 0.50 40.00 0.0% Roofs 0.06 2500.0 0.95 90.00 27.9% Avg. 0.49 39.24 100.0% Total Area 0.21 0.49 39.24 Increase/Decrease in Impervious Area (ac) (sq.ft) Design Point Surface Improvement Area Area Comments 1 Playground Curb & gutter and walks Gravel/Deck Roofs Avg. -0.01 -588.0 0.00 -107.0 -0.02 -680.0 0.05 2091.0 Reduction in area Reduction in area Reduction in area Increase in area Total Area 0.02 716.00 Netlncrease � • CASA_I mperv.xlsx\Su b-Basi ns 7/ 18/2023 TIME OF CONCENTRATION - 2-YEAR PROJECT, CALCULATED BY: Cf = 1.00 Harmony House Building Addition i2 Consultants, Inc. DATE: 7/19/2023 � �. RURAL OR NON URBANIZED SUB-BASIN INITIAL/OVERLAND TRAVEL TIME tc CHECK FINAL REMARKS DATA TIME (To�) (t�) (URBANIZED) tc BASIN DP AREA C C�Cf Length Slope t� Length Slope R V tt to Total L t� ID Ac Ft % min Ft (fUft) Ft fps min min ft min min (0) (1) (2) (3) (4) (5) (6) (7) (8) (8a) (9) (10) (11) (12) (13) (14) H-A 1 0.21 0.36 0.36 20 2.0 4.9 75 0.020 1.0 1.5 0.8 5.7 95 10.5 5.7 Use Tc = 5.7 mins A 1 0.21 0.49 0.49 45 2.0 6.1 50 0.02 1.0 1.5 0.6 6.6 95 10.5 6.6 Use Tc = 6.6 mins � z 3 4 5 6 7 Equations: Non-urban Tov 1. 87(1.1-CC f) �D^ v2 tt = L S �1/3 6�V V=CVSW0.5 (1) (2) or Fig. 3-3 Velocity V (1.4/n)*(R^2/3))*0.5) S in fUft, R= Area/Wetted Perimeter in ft, n= Roughness Coeff. Urbanized t� _ (L/180)+10 (3) TIME OF CONCENTRATION -100-YEAR PROJECT.� CALCULATED BY. Cf = 1.25 Harmony House Building Addition i2 Consultants, Inc. DATE: 7/19/2023 RURAL R N N URBANIZED SUB-BASIN INITIAL/OVERLAND TRAVEL TIME tc CHECK FINAL REMARKS DATA TIME (To�) (tt) (URBANIZED) tc BASIN DP AREA C C'Cf Length Slope t� Length Slope R V h tc Total L tc ID Ac Ft % min Ft % Ft fps min min ft min min (0) (1) (2) (3) (4) (5) (6) (7) (8) (8a) (9) (10) (11) (12) (13) (14) H-A 1 0.21 0.36 0.45 20 2.0 4.3 75 0.02 0.0 1.5 0.8 5.1 95 10.5 5.1 Use Tc = 5.1 mins A 1 0.21 0.49 0.61 45 2.0 4.9 50 0.02 1.0 1.5 0.6 5.4 95 10.5 5.4 Use Tc = 5.4 mins � � z 3 4 5 6 Equations: Non-urban Tov 1.87(1.1-CC�)'D^v2 tt= L S �1/3 6�V V=CVSW0.5 (1) (2) or Fig. 3-3 Velocity V (1.4/n)*(R^2/3))*0.5) S in ft/ft, R= Area/Wetted Perimeter in ft, n= Roughness Coeff. Urbanized t� _ (L/180)+10 (3) � 1 Rational Method Direct Runoff - 2-YR A-11 Project: Harmony House Building Addition Location: 3105 E. Harmony Road Fort Collins, Colorado Project Number 1068-3 Date: 7/19/2023 �� Consultants, Inc. 16911 Potts Place, Mead, CO 970.2D.9148 troy@i2-consultants.com Rational Method: Q= C,CIA Q: Q: Runoff in cfs (peak) C: C: Runoff Coefficient Cf: Cf: Frequency Adjustment Factor I: I: Rainfall Intensity (in/hr) for design event A: A: Basin Area (acres) 2-YEAR Design Point Basin ID Area C CfC t� I QZ 1 H-A 0.21 0.36 0.36 5.7 2.72 0.20 1 A 0.21 0.49 0.49 6.6 2.58 0.26 C:\Users\troy�Dropbox�I2�Projects\1068-3 CASA\Documents\Drainage\CASA rational.xlsx 7/18/2023 Rational Method Direct Runoff - 100-YR A-12 Project: Harmony House Building Addition Location: 3105 E. Harmony Road Fort Collins, Colorado Project Number 1068-3 Date: 7/19/2023 �� Consultants, Inc. 16911 Potts Place, Mead, CO 970.2D.9148 troy@i2-consultants.com Rational Method: Q= C,CIA Q: Q: Runoff in cfs (peak) C: C: Runoff Coefficient Cf: Cf: Frequency Adjustment Factor I: I: Rainfall Intensity (in/hr) for design event A: A: Basin Area (acres) 100-YEAR Design Point Basin ID Area C CfC t� I Q,00 1 H-A 0.21 0.36 0.45 5.1 9.89 0.92 1 A 0.21 0.49 0.61 5.4 9.69 1.22 C:\Users\troy�Dropbox�I2�Projects\1068-3 CASA\Documents\Drainage\CASA rational.xlsx 7/18/2023 FORT COLLINS STORMWATER CRITERIA MANUAL Hydrology Standards (Ch. 5) 3.0 Rational Method Table 3.2-2. Surface Type - Runoff Coefficients Surface Type Runoff Coefficients Hardscape or Hard Surface Asphalt, Concrete 0.95 Rooftop 0.95 Recycled Asphalt 0.80 Gravel 0.50 Pavers 0.50 Landscape or Pervious Surface Lawns, Sandy Soil, Flat Slope < 2% 0.10 Lawns, Sandy Soil, Avg Slope 2-7% 0.15 Lawns, Sandy Soil, Steep Slope >7% 0.20 Lawns, Clayey Soil, Flat Slope < 2% 0.20 Lawns, Clayey Soil, Avg Slope 2-7% 0.25 Lawns, Clayey Soil, Steep Slope >7% 0.35 3.2.1 Composite Runoff Coefficients Drainage sub-basins are frequently composed of land that has multiple surface types or zoning classifications. In such cases a composite runoff coefficient must be calculated for any given drainage sub-basin. The composite runoff coefficient is obtained using the following formula: „ � (c,xA� ) c = __� A, Where: C= Composite Runoff Coefficient C; = Runoff Coefficient for Specific Area (A;), dimensionless A; = Area of Surface with Runoff Coefficient of C;, acres or square feet n= Number of different surfaces to be considered At= Total Area over which C is applicable, acres or square feet 3.2.2 Runoff Coefficient Frequency Adjustment Factor Equation 5-2 The runoff coefficients provided in Table 3.2-1 and Table 3.2-2 are appropriate for use with the 2-year storm event. For any analysis of storms with higher intensities, an adjustment of the runoff coefficient is required due to the lessening amount of infiltration, depression retention, evapotranspiration and other losses that have a proportionally smaller effect on high-intensity storm runoff. This adjustment is � �� 3.2 Runoff Coefficients r,�t CO��IC1S Page 5 �� FORT COLLINS STORMWATER CRITERIA MANUAL Hydrology Standards (Ch. 5) 3.0 Rational Method applied to the composite runoff coefficient. These frequency adjustment factors, Cf, are found in Table 3.2-3. Table 3.2-3. Frequency Adjustment Factors Storm Return Period Frequency Adjustment (years) Factor (Cf) 2, 5, 10 1.00 25 1.10 50 1.20 100 1.25 CxCF PRODUCT OF CxCF CANNOT EXCEED THE VALUE OF 1 3.3 Time of Concentration 3.3.1 Overall Equation The next step to approximate runoff using the Rational Method is to estimate the Time of Concentration, T�, or the time for water to flow from the most remote part of the drainage sub-basin to the design point under consideration. The Time of Concentration is represented by the following equation: T�=T;+Tt Where: T� = Total Time of Concentration, minutes T; = Initial or Overland Flow Time of Concentration, minutes Tt = Channelized Flow in Swale, Gutter or Pipe, minutes 3.3.2 Overland Flow Time Overland flow, T;, can be determined by the following equation: 1.87(1.1—CxCf)� T, 3� Where: C= Runoff Coefficient, dimensionless Cf = Frequency Adjustment Factor, dimensionless L= Length of Overland Flow, feet S = Slope, percent City of F�t`�` Equation 5-3 Equation 3.3-2 OVERLAND FLOW LENGTH L=200' MAX IN DEVELOPED AREAS L=500' MAX IN UNDEVELOPED AREAS 3.3 Time of Concentration Page 6 FORT COLLINS STORMWATER CRITERIA MANUAL Hydrology Standards (Ch. 5) 3.0 Rational Method Table 3.4-1. IDF Table for Rational Method Duration Intensity Intensity Intensity (min) 2'Year 10-year 100-year (in/hr) (in/hr) (in/hr) 5 2.85 4.87 9.95 6 2.67 4.56 9.31 7 2.52 4.31 8.80 8 2.40 4.10 8.38 9 2.30 3.93 8.03 10 2.21 3.78 7.72 11 2.13 3.63 7.42 12 2.05 3.50 7.16 13 1.98 3.39 6.92 14 1.92 3.29 6.71 15 1.87 3.19 6.52 16 1.81 3.08 6.30 17 1.75 2.99 6.10 18 1.70 2.90 5.92 19 1.65 2.82 5.75 20 1.61 2.74 5.60 21 1.56 2.67 5.46 22 1.53 2.61 5.32 23 1.49 2.55 5.20 24 1.46 2.49 5.09 25 1.43 2.44 4.98 26 1.4 2.39 4.87 27 1.37 2.34 4.78 28 1.34 2.29 4.69 29 1.32 2.25 4.60 30 1.30 2.21 4.52 31 1.27 2.16 4.42 32 1.24 2.12 4.33 33 1.22 2.08 4.24 34 1.19 2.04 4.16 35 1.17 2.00 4.08 36 1.15 1.96 4.01 37 1.16 1.93 3.93 38 1.11 1.89 3.87 r�-t,�� Duration Intensity Intensity Intensity 2-year 10-year 100-year (min) (�n/hr) (in/hr) (in/hr) 39 1.09 1.86 3.8 40 1.07 1.83 3.74 41 1.05 1.80 3.68 42 1.04 1.77 3.62 43 1.02 1.74 3.56 44 1.01 1.72 3.51 45 0.99 1.69 3.46 46 0.98 1.67 3.41 47 0.96 1.64 3.36 48 0.95 1.62 3.31 49 0.94 1.6 3.27 50 0.92 1.58 3.23 51 0.91 1.56 3.18 52 0.9 1.54 3.14 53 0.89 1.52 3.10 54 0.88 1.50 3.07 55 0.87 1.48 3.03 56 0.86 1.47 2.99 57 0.85 1.45 2.96 58 0.84 1.43 2.92 59 0.83 1.42 2.89 60 0.82 1.4 2.86 65 0.78 1.32 2.71 70 0.73 1.25 2.59 75 0.70 1.19 2.48 80 0.66 1.14 2.38 85 0.64 1.09 2.29 90 0.61 1.05 2.21 95 0.58 1.01 2.13 100 0.56 0.97 2.06 105 0.54 0.94 2.00 110 0.52 0.91 1.94 115 0.51 0.88 1.88 120 0.49 0.86 1.84 3.4 Intensity-Duration-Frequency Curves for Rational Method Page 8 FORT COLLINS STORMWATER CRITERIA MANUAL Hydrology Standards (Ch. 5) 3.0 Rational Method Figure 3.4-1. Rainfall IDF Curve — Fort Collins io.00 . 9.00 8.00 7.00 � 0 � 6.00 N N L C �+ 5.� �N C d C C 4.00 � �._ �_ � � � \ ♦ \ \ 3.00 � -� � �� ♦ �� ` � 2.00 � � � � �� 1.00 — � � � � � � � �� _ _ _ _ � � � � � �� ` I�'�� 0.00 . 0 10 20 30 40 50 60 70 80 90 100 110 120 Storm Duration (minutes) c�tyof 3.4 Intensity-Duration-Frequency Curves for Rational Method F�tf Page 9 FORT COLLINS STORMWATER CRITERIA MANUAL Hydrology Standards (Ch. 5) : � � ►I ►� Table 4.1-2. Land Use - Percent Impervious Percent Impervious Land Use (%) Residential Urban Estate 30 Low Density 50 Medium Density 70 High Density 90 Commercial Commercial 80 Industrial 90 Undeveloped Open Lands, Transition 20 Greenbelts, Agriculture 2 Offsite Flow Analysis (when Land Use not defined) 45 Reference� For further guidance regarding zoning classifications, refer to the Land Use Code, Article 4. For Final Plan (FP) submittals, impervious values must be based on the proposed land surface types. Refer to Table 4.1-3 for recommended percent impervious values. Table 4.1-3. Surface Type — Percent Impervious Percent Impervious Surface Type (%) Hardscape or Hard Surface Asphalt, Concrete 100 Rooftop 90 Recycled Asphalt 80 Gravel 40 Pavers 40 Landscape or Pervious Surface Playgrounds 25 Lawns, Sandy soil 2 Lawns, Clayey soil 2 r�t�� 4.1 Input Parameters Page 11 � 1 ' ' , 1 ' ' ' ' ' ' ' , ' ' ' ' ' :y . �y :a J('�'' °� r :� � .�s� itti�� . xl�;1.,, r 4 r.� • • • •• • -. ' - . �.�a � . �.. . :.. �� 'l*r � i I i , .. Addendum to the Final Drainage and Erosion Control Study for Harmony Technology Park First Filing Fort Collins, Colorado Prepared for: MAV Development 303 Detroit Street, Suite 301 Ann Arbor, Michigan 48104 Prepared by: Stantec Consulting, Inc. 209 South Meldrum Fort Collins, Colorado 80521 (970)482-5922 ad � / � 5�11�C 1 1 1 ' ,l �J ' 1 , ' LJ ' t ' ' ' ' 1 1 APPENDIX B EXCERPTS FROM FINAL DRAINAGE AND PROJECT DEVELOPMENT REPORT FOR HARMONY TECHNOLOGI�' PARK FIRST FILING ' ' :1 ' , 1 1 ' ' 1 ' ' ' ' ' , 1 ' ' 1 Job Name: Harmony Technology Park Client: Celest�ca Date: 11 /12/97 By: The Sear Brown Group Job Number 785-001 File Name: celestica drainage.dat OMPOSITE RUNOFF COEFFICIE�iTS 0 Basin Area Imperv. Pervious C C Comp. Percent # (A�) _ Area (Ac) Area (Ac) Imperv. Pervious C Impervious 1 3.77 " 3.51 0.26 0.95 0.2 0.90 93.10 3 1.97 1.6 0.37 0.95:. `-- : 0.2 . 0.81 81.22 � 4 - 0.52: ' 0 , 0.52 0.95 ' 0.2 0.20 0.00 5 1.8 0 1.8 � 0.95 0.2 0.20 0.00 6' 3.35 -:'=`1.82�°�- 1.53 0.95 0.2 0.61 54.33 � 1.34 1.28 0.08 0.95 0.2 0.91 94.03 8 1.41 1.31 0.1 0.95 0.2 0.90 92.91 9 2.68 2.3 0.38 0.95 0.2 0.84 85.82 10 2.93 2.93 0 0.95 0.2 0.95 100:00 11 8.07 0 8.07 0.95 0.2 0.20 0.00 OS-1 1.45 0.54 0.91 0.95 0.2 0.48 37.24 OS-2 2.21 1.36 0.85 0.95 0.2 0.66 61.54 OS-3 2.31 1.08 1.23 0.95 0.2 0.55 46.75 �S-4 0.94 0.18 0.76 0.95 0.2 0.34 19.15 � • OS-1=WEST PART OF HARMONY RD. OS-2=TECHNOLOGY PARKWAY OS-3=EAST SIDE OF COUNTY RD. 9 OS-4=EAST PART OF HARMONY RD. ot tin Utt�c�ai Lopy . a � � � � � � � � � � � � � � � � � ■� � � � ob Name Harmuny Tech Park Client CelesUca Date ,,,,:,., Time of Concentration (10 year) By The Sear Brown Group Job Number 785-001 Ti = Tc =(1.87(1.1 - C x C�D^0.5)!S^(1/3) File Na e Celestica Drainage dal Cf = 1.0 Sub-Basin Data Initial/Overland Time Travel Time Composite C Final Remarks Desig Area C Length Slope Ti Length Slope Velocdy Tt Calculations Tc �a0� lhl (%) (min) (ft) TVPe (%) (ft/s) (min) (min) � 3�� 050 18 500 094 670 p 7.gp 25 q4� SAO 3 � g� � B1 6� 2 00 3 34 300 P 2.30 1 6 3.13 6A7 4 0 52 0?0 20 ?5 00 2.57 140 G 070 2 �� 5.00 Use a 5 minute mimmum 5 � 8 020 25 25A0 2.88 300 G 070 2 2.50 5 38 6 3.35 0 61 60 2A0 5.66 390 P 1.gp 2 325 8.91 7 1.3a 0 91 10 2A0 0.91 235 P 2.30 1.6 2.45 SAO Use a 5 minute mimmum 8 � 41 � 90 �4 2 00 0.95 205 P 2.4� 22 �,55 5.00 Use a 5 mmute minimum 9 2 68 0. 84 20 2.00 1. )0 930 P 0.80 2 775 10 2 93 0 95 5 9.45 2.00 0.50 400 P 2 80 i.6 4.17 � 1 B 07 5.00 Use a 5 minute mmimum 0 20 320 0 70 33.97 500 G 0.60 22 3 �g OS-1 1 45 0 48 ? 37 70 � 1.23 4 B4 610 P 7.80 2.5 4.07 OS-2 2 21 0 66 8.91 20 1 23 3.42 750 P 1.8 1.95 6 41 OS-3 2 31 0 55 ? 9.83 � 1 23 4.29 1080 P 1.90 1 B 10A0 OS-4 0 94 0 34 ?p � � 1429 3 5.90 560 P 1 8 2 5 3.73 9 64 � � � � � � � � � . � � � � � � � � � � � Jub Name: Hannony Tech Park ' ; � Client: Celestica � � Date: ,�nz�9� Time of Concentration (100 year) ' By: The Sear Brown Group Job Nu 785-001 TI = TC =(1.87(1.1 - C x C�D"0.5)/S^(1/3) File Name: Celestica drainage.dat � Cf = 1.25 Sub-Basin Data Initial/Overland Time Travel Time Composite C Final Remarks , Desig: Area C Length Slope Ti Length Slope Velocity Tt Calculations Tc (ac) (h) (%) (min) (h) (%) (�s) (min) _ i � 3.77 0.90 �g (min) , 5.00 0.46 670 1.90 2.5 4.47 5.00 3 1.97 0.81 60 2.00 1.02 300 2.30 1.6 3.13 ' 5.00 Use a 5 minute minimum � 4 0.52 0.20 � 20 25.00 2.43 140 0.70 2 1.17 5.00, Use a 5 minute minimum 5 1.8 0.20 ' 25 25.00 2.72 300 0.70 z � 2.50 5.22 6 3.35 0.61 60 2.00 3.92 390 1.90 2 3.25 7 1.34 0.91 10 7.17 4 2.00 0.47 235 2.30 1.6 2.45 5.00 Use a 5 minute minimum 8 1.41 0.90 10 2.00 0.47 205 2.40 2.2 1.55 1 5.00 Use a 5 minute minimum � 9 2.68 0.84 20 2.00 0.30 930 0.80 2 7.75 8A5 10 2.93 0.95 5 2.00 0.33 400 2.80 1.6 4� � 5.00 Use a 5 minute minimum 11 8.07 0.20 320 0.70 32.02 500 0.60 ' 2.2 3.79 35.81 . � OS-1 1.45 0.48 20 1.23 3.91 610 1.80 2.5 4.07 � OS-2 � 2.21 0.66 7.98 � E 20 1.23 2.13 750 1.80 1.95 6.41 � ' OS-3 2,31 8.54 ` 0.55 20 1.23 3.21 1080 1.90 1.8 10.00 OS-4 O.gq 13.21 . 0.34 20 1.23 5.23 560 1.80 2.5 3.73 _ 8.97 � � � � � � �:• � � � � � � � � � � � � � e � r ., Job Name: Harmony Tech. Park � - � Client: Celestica . Date: StOR11 Drainage System Preliminary Design Data BY The Sear Brown Group Job Number: 785-001 File Name: Storm 10 yea� Cf = 1 A - Celestica drainage.dat _ , - . �� 00_�__� ��_�__- s�a�� s�s� �. �� sa� ., �� .�� ___ ��1 _�___ ��_��___ ��_�___ ��_�=__ ��_�___ ��■��..�. C C z Dinct Ww � ToW Stra�l C IntanMV Mu Rundl RwwR RunoM Slop� C�W I�NA�) fac) ldal Ich) lcis) (%) Ich OBO SIB 3.7! 18.16 18.�8 oe� s.�2 �.e� e.ie aie o m s e o.0 o.se o.se ozo ss ie �.ee i.ee oe� �e 3.is e3a e.3e oai 58 ts� e.�o e.�e 0.90 � S.B � �� v �. -"' •.a [.a0 10.17 oes s.e z.a� �e.ss 0.20 2.3 B 07 3J7 O.W �.B 1.15 3.70 0.88 /,1 2.21 8.13 O55 ' 3A 2.91 1.83 0 50 - 5 8 275 osa .o ..e 077 IB B� 7�OB 10.17 1.83 �ar ao. Sbps Siz� 1%) 6N . "m ��ps � RemaAit �D^ Valociry Owpn V�kc�1y . (c1s) (Itla) (ds) (Ns) - CUH6 CUT TO POND A CURB CUT TO PoNO B aor+o e u� FONO A AREA - TVPE'R' INIEf IN SUMP AREA INLET TRENCH DRAIN CURB CUT TO SWALE BUIIDING ROOF OPEN MEA HARMONY RD TYPE R INLETS TO R��< T'PE R wLE7 30' RCP lo �� Job Name: Harmony Tech Park � Cliant: Celestica . �aie: - Storm Drainage System Preliminary Design Data BY The Sear Brown Group Job Number 785-001 File Name: Celestica Drainaye.dat Storm 100 year Cf = 1.25 �� ao� ,. �� aa� .. �� ao��i oa��m■�� ao� �� ■_�___ �m_�___ �� ___ ��_�___ _� �___ ��_�_=� ■��m�� ..- ann om.r rorai snen C InWisrty Ana Runolt Rumll Rurroll Slope Gpu (�tl lac) (ctal (cic) 1c1a1 (%1 (ch O.BO Y.00 3.77 33.83 93.83 O.Bt Q00 t.B7 17.73 17.73 � 010 8.00 0.57 1.17 1.17 . o zo e.eo �.e � o� �.oi 061 B.ZO 3.35 20.88 20.88 . 0 91 Y.Op 1 3r 12.OE 12.08 0 GO . . 0.� 1.�1 12.BB 0.� 7.� 2.68 71.17 0.95 8.00 Z.B3 38.37 O.X� 970 8.07 7.�8 0.18 7.80 1.�5 B.eE O.6b I]0 2.77 1107 0.� 8 � 3.31 10.10 0.3/ 7.E0 0.&1 3.07 O u B 7.7$ 2�.7$ o� �e .a ��. 0 �, �.8 B.� 80.58 0.71 9.35 5.08 1B.)] 28�97 7.18 10�10 9.07 fi0�_SB 28.72 RariwNs �W Sii� t+y nm Dssipn VNocM �+Wn VNocny t�l lws7 l�l �w.i CURB CLfT TO POND A CURB CUi TO PONO B POND B AREA VONO A AREA NPE'R' INLET IN SUMP AREA W�f TRENCH ORAIN CUq6 CUf TO SWALE BUILDING ROOF OPEN AREA HARMOryY RD TYPE R IN�EfS TO RETENit( _ TVPE R WLEf �; . � . ,�� . 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'_ _ _ __ -_-� - __ __ .. _ _ __ ' '_ _ _ - __ � _ �-_"__' — "� — — ' '_-- —1 � �- � _� .'_. _. ____ _ _ _ _ _ � �--�--- _ _ _ ` �— -- — — D50 - 13� RIFRRF_. — �I \ � PUCE W/IN WINCWALLS — � � — sJ � — 49?g f . _ _ _ � 34_CDOT CLA55 A BEDO�rvC = I I _ — - � T � J —. — f— .- _... \J __ y . . _ .. _ . . - I r = __ _ � � — ______ ___ -'I�I __. ,y �A i . �-_ - HARMONY ROAD - - -- '- " _ -... / �,. . a �, � }I i �n kf F � (� li II � r , I ` li � �. �a tv t� ` ' �,.:.. y - } . ` +'+22� 1 J' � �'.' .1 1.� ___. �9�� _ __- _� _ NEW iB� STqiM 'H' �� SE�T C-RS � � � "__� t-�--: -� ._ _ ...._ . � � �-T _ � . r �. . _ /nA11 �� .. �� - ��_ � E%IS11NG iB� --_— - - - } M RAIN ��^ti � .. � - �-.�� — STINt D �i � . ��D�S..SS��/ ` — 92/ 1<W] .� 15�W 16�00 % 1]�CO ' TGNELEVI9YL]2 �IB I 1�. ' � 19W '.= � ' STRIBKO � _— }}} � I-1 — �_ , -f— —� '� �f� —� � CFFSET�.R<OR -� —} - - ... 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". .. ,- � HEWLETTPACKARD --. _-- Q __-(4919) --- -''- . �� (4915) - - w = _ == =- -_ � _- � -- - , - _ - _ - _ � _�_ _ _ --" . _ _—'_- _ _- _ _- ___ - -_-_--�. . -. __ - __ _-- _ _-s- . � ._.. _ -- _ '- . .. - _ _ _ __ - � � — . . _ - __ . � _.._ _- ". � - -^g � .. . ' � � � _. . " _ __ _-' , _ _ _ i - _ ��- ..— - — -"f"to_- � .__ NEW�' STORM'H�- _ "' . . - - .. . _ ._ �I . - 1 } SEE SHEEt C 135 � � � Efl0901J CON1R0. FABRIC � � " - � / / \ �I D50 - 6' BURIED RIPRPG �I NAG 95 �\ � / 5' Loxc x Y oEPiH x 5' MOE -- / � 5[[ SHEET C-t2t 3 % _�--� I 1� .- 12' C�OT ClASS A BEDOING � / P /eq � -�� ___ . ��9 �4� ib91g� h _ -. _ - � �—�� . _ _ -- - ___. .. . . . . . _ ___ _- ---' -- HARMONY ROAD - � � - _ --_ _ _____� . ______. . . —� —� ..'_ ____ ___ —_ .- ' __ _ _ _ _ - � . . _— . � _____-=1. . . . -__ - -- - _ �� 9� _ 9 / _ . B .._. -� - - 0 — — -�.,��>9� 2] N�N i .. 35�N 2EN ]YO� �-.]9W'J — — - N W — I � _ _ _ _ .. . I � - " � - _ �' ` ' . 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" .. , _ _ . .___-__�� _ _ � -.' _ - — _ - _ _ - _ _ �- I _ _ _ g � ' �� _ Z _ ^ J 2 . � - _ _..-�. _. .. � � _ . . - � � � �, - E �I � '��1 �. nuoisnaeeonaensnaeroeeseeoeo nuo Mu�cHeo.iHcwoirvc aecr+noeo s�oaEs nvo aoNo naews 2 CONTMCTORSHALLPROVIOETEMPOMRY IRRIGPTION IN NON-IRRIWTE� GFASS SEEO AREAS FOF ESTABLISHMENt OF GMSSES. ] STOCH PhES NOT TO E%LEE� 10' HIGH SOII. l BLLOFFSREAflEP5015NfiBEoOURING CONSTFOCTION A0.E TO9E RENEGETFtEO AN� RETVRNED TO A$IMILAR CONOITION l�5 PRIOR TO GONSiqUCTION - I W1IGNSIPANDHYMVLM�65%� � EROSIONCONLPOLiABRIC � STMWBPIECHECK�PM 'y � {� €'d . p� s [ 3' �4'S� J��fr}!� ��S � �gY 6 w"- $. m e � a"� F� _ ?e Ya �' �[`��¢55e. �5ns�a j,� 4��`a°c r^_P, v��C Y L,�II�IIY I I�I�I�I�I� I� 4 S ��4,� g m'� g �'� � E o (I8 I I �I �I �I � I I� Illl�i � STMWBPLEINLETFlIiEP I I I � �� DiXECTIONOF0.0W I I� tiF X� SILIFENCE C� iOW iOGOFWNH a O Z y � oH � Jg �D o cu� unury rvonFicanory U a¢>. � ceHrEROFw�oano0 '" �a �a 1-800-922-1987 " � � � " E¢� Oz E � o � Ta o U � roA a^'o i E� O M.MeEA��.�rEs m p E �po ` rnU' a s � U O O Ciry of Fort Collins, Colorado �� LL� LL w¢ UTILITV PLAN APPROVAL � F 'IFPROVEO. Cry Engmmr �a�� Pe�mit5eal CNELNEO 4Y WNer h Wmtewoler Otlty Do[e CHECKm 9Y Stormrn[er V[I�ly Dote cnecKm er. po* g R �a oaie PRELIMINARY CHECNEO HY: NOTFORCONSTRl1CTIpN iroKc E g Oab oalnioe CHECKED BE Date MESE FIANS IV��E BEEN FEYIFMED 8Y iHE LOClL EMIIT i0R CONCEW ONLY. iHE REVIEW WES NOi IMPIX HESPoNSIBIt11Y H! iNE FEVIEWING OEPIAINEM, TVE LOCA EH�tt ENGMEER. OR ME �� LOGL EMIIY fOP I�CCURPLY NID CORPECiNESS OG ME CALCOIATONS. NftMERNORE, iHE RENEY/ D�ES .:mowa �aee� NOi IMPLY i1Ni OURNII11E5 OF IlEMS ON 1HE PlANS Mf. lHE LINRL OIIM'TIIIFS REOUIRE�. iHE RMEW - - SWLLL NOT BE CON51RUE0 IN ANT RE/SON PS pp� � �" o� RCCEM�fICE OG RKWCVL HESPONSIBILIIY BY iME pr 'ngNan C-120 LOGL EMIIT GOfl AO�IIIOWL OI1PMfIlES �G IIEMS SHOWN 11UT NAY BE FEOIIIRED DUkINC iHE ftevision SM1ael CONSIPIICtION MiSE. Q 6 0l 18 P�i � G�'� � v