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Home My WebLink AboutBREEZE THRU HEADQUARTERS - PDP - PDP180013 - SUBMITTAL DOCUMENTS - ROUND 1 - DRAINAGE RELATED DOCUMENTCorporate Headquarters 112 N. Rubey Drive Golden, Colorado 80403 Ph 303.940.9966 Fax 303.940.9959 Northern Colorado 4007 S. Lincoln Avenue, Suite 405 Loveland, Colorado 80537 Ph 970.353.7600 Fax 866.242.9106 Denver 3001 Brighton Boulevard, Suite 651 Denver, Colorado 80216 Ph 303.940.9966 Fax 303.940.9959 Rocky Mountains 419 Oak Street, PO Box 770152 Steamboat Springs, Colorado 80477 Ph 970.879.1825 Fax 866.242.9106 08/31/2018 City of Fort Collins Engineering 281 North College Avenue Fort Collins, CO 80524 RE: 6464 South College Avenue Breeze Thru Headquarters Drainage Conformance Letter This letter and the accompanying appendices are presented for verification that the proposed improvements to this project site are in conformance with Fort Collins storm drainage criteria and specifications. The proposed improvements for this site consist of the vertical expansion of an existing structure to provide 10 new apartments as well as the addition of a 2400sqft, detached garage and access drive in the northeast corner of the site. In the area directly west of the existing structure, the asphalt will be removed with limited regrading to accommodate a grassed frontage area. The area directly south of the new structure will be regraded slightly to allow for the new access drive. The existing parking lot will also require minor regrading to bring existing ADA stalls up to current standards. Several landscape islands will be added to the parking area as well. Runoff from the new structure will be routed via roof drains and a trench drain to a water quality LID grassed linear bioswale that runs north along the east side of the structure to the northeast property corner. Runoff from the new access drive will also be routed to the grass swale via a curb cut and trench drain. See the grading / drainage plan and appendices for calculations and further information on new site runoff and water quality treatment. Historically roof flows are collected through gutters and are dispersed into the parking area through roof drains. Site runoff then travels southwest to northeast overland and is ultimately conveyed to a drainage way to the east of the site. Stormwater is conveyed north in this drainage way to the Fossil Creek Drainage Basin. Runoff from the existing structure and parking area will maintain historic drainage patterns for the site. The overall imperviousness for this site has been reduced from 83% to 78%. Because this site’s overall imperviousness has been reduced, new runoff has been accounted for and treated, and historic drainage patterns have been maintained, no additional improvements to the drainage infrastructure are required for the development of this site other than that which is proposed within this drainage conformance package and accompanying plans. Baseline Engineering Corp Noah Nemmers, PE Colorado PE No. 39820 VICINITY MAP United States Department of Agriculture A product of the National Cooperative Soil Survey, a joint effort of the United States Department of Agriculture and other Federal agencies, State agencies including the Agricultural Experiment Stations, and local participants Custom Soil Resource Report for Larimer County Natural Area, Colorado Resources Conservation Service June 28, 2018 Preface Soil surveys contain information that affects land use planning in survey areas. They highlight soil limitations that affect various land uses and provide information about the properties of the soils in the survey areas. Soil surveys are designed for many different users, including farmers, ranchers, foresters, agronomists, urban planners, community officials, engineers, developers, builders, and home buyers. Also, conservationists, teachers, students, and specialists in recreation, waste disposal, and pollution control can use the surveys to help them understand, protect, or enhance the environment. Various land use regulations of Federal, State, and local governments may impose special restrictions on land use or land treatment. Soil surveys identify soil properties that are used in making various land use or land treatment decisions. The information is intended to help the land users identify and reduce the effects of soil limitations on various land uses. The landowner or user is responsible for identifying and complying with existing laws and regulations. Although soil survey information can be used for general farm, local, and wider area planning, onsite investigation is needed to supplement this information in some cases. Examples include soil quality assessments (http://www.nrcs.usda.gov/wps/ portal/nrcs/main/soils/health/) and certain conservation and engineering applications. For more detailed information, contact your local USDA Service Center (https://offices.sc.egov.usda.gov/locator/app?agency=nrcs) or your NRCS State Soil Scientist (http://www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/contactus/? cid=nrcs142p2_053951). Great differences in soil properties can occur within short distances. Some soils are seasonally wet or subject to flooding. Some are too unstable to be used as a foundation for buildings or roads. Clayey or wet soils are poorly suited to use as septic tank absorption fields. A high water table makes a soil poorly suited to basements or underground installations. The National Cooperative Soil Survey is a joint effort of the United States Department of Agriculture and other Federal agencies, State agencies including the Agricultural Experiment Stations, and local agencies. The Natural Resources Conservation Service (NRCS) has leadership for the Federal part of the National Cooperative Soil Survey. Information about soils is updated periodically. Updated information is available through the NRCS Web Soil Survey, the site for official soil survey information. The U.S. Department of Agriculture (USDA) prohibits discrimination in all its programs and activities on the basis of race, color, national origin, age, disability, and where applicable, sex, marital status, familial status, parental status, religion, sexual orientation, genetic information, political beliefs, reprisal, or because all or a part of an individual's income is derived from any public assistance program. (Not all prohibited bases apply to all programs.) Persons with disabilities who require 2 alternative means for communication of program information (Braille, large print, audiotape, etc.) should contact USDA's TARGET Center at (202) 720-2600 (voice and TDD). To file a complaint of discrimination, write to USDA, Director, Office of Civil Rights, 1400 Independence Avenue, S.W., Washington, D.C. 20250-9410 or call (800) 795-3272 (voice) or (202) 720-6382 (TDD). USDA is an equal opportunity provider and employer. 3 Contents Preface.................................................................................................................... 2 Soil Map.................................................................................................................. 5 Soil Map................................................................................................................6 Legend..................................................................................................................7 Map Unit Legend.................................................................................................. 8 Map Unit Descriptions.......................................................................................... 8 Larimer County Area, Colorado...................................................................... 10 36—Fort Collins loam, 3 to 5 percent slopes.............................................. 10 49—Heldt clay loam, 3 to 6 percent slopes................................................. 11 63—Longmont clay, 0 to 3 percent slopes.................................................. 12 65—Midway clay loam, 5 to 25 percent slopes........................................... 13 References............................................................................................................15 4 Soil Map The soil map section includes the soil map for the defined area of interest, a list of soil map units on the map and extent of each map unit, and cartographic symbols displayed on the map. Also presented are various metadata about data used to produce the map, and a description of each soil map unit. 5 6 Custom Soil Resource Report Soil Map 4482860 4482880 4482900 4482920 4482940 4482960 4482860 4482880 4482900 4482920 4482940 4482960 493450 493470 493490 493510 493530 493550 493570 493590 493610 493450 493470 493490 493510 493530 493550 493570 493590 493610 40° 29' 50'' N 105° 4' 38'' W 40° 29' 50'' N 105° 4' 31'' W 40° 29' 46'' N 105° 4' 38'' W 40° 29' 46'' N 105° 4' 31'' W N Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 13N WGS84 0 40 80 160 240 Feet 0 10 20 40 60 Meters Map Scale: 1:847 if printed on A landscape (11" x 8.5") sheet. Soil Map may not be valid at this scale. MAP LEGEND MAP INFORMATION Area of Interest (AOI) Area of Interest (AOI) Soils Soil Map Unit Polygons Soil Map Unit Lines Soil Map Unit Points Special Point Features Blowout Borrow Pit Clay Spot Closed 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 Sodic Spot Spoil Area Stony Spot Very Stony Spot Wet Spot Other Special Line Features Water Features Streams and Canals Transportation Rails Interstate Highways US Routes Major Roads Local Roads Background Aerial Photography 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 Map Unit Legend Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI 36 Fort Collins loam, 3 to 5 percent slopes 1.4 38.3% 49 Heldt clay loam, 3 to 6 percent slopes 1.3 35.9% 63 Longmont clay, 0 to 3 percent slopes 0.0 0.0% 65 Midway clay loam, 5 to 25 percent slopes 1.0 25.8% Totals for Area of Interest 3.7 100.0% Map Unit Descriptions The map units delineated on the detailed soil maps in a soil survey represent the soils or miscellaneous areas in the survey area. The map unit descriptions, along with the maps, can be used to determine the composition and properties of a unit. A map unit delineation on a soil map represents an area dominated by one or more major kinds of soil or miscellaneous areas. A map unit is identified and named according to the taxonomic classification of the dominant soils. Within a taxonomic class there are precisely defined limits for the properties of the soils. On the landscape, however, the soils are natural phenomena, and they have the characteristic variability of all natural phenomena. Thus, the range of some observed properties may extend beyond the limits defined for a taxonomic class. Areas of soils of a single taxonomic class rarely, if ever, can be mapped without including areas of other taxonomic classes. Consequently, every map unit is made up of the soils or miscellaneous areas for which it is named and some minor components that belong to taxonomic classes other than those of the major soils. Most minor soils have properties similar to those of the dominant soil or soils in the map unit, and thus they do not affect use and management. These are called noncontrasting, or similar, components. They may or may not be mentioned in a particular map unit description. Other minor components, however, have properties and behavioral characteristics divergent enough to affect use or to require different management. These are called contrasting, or dissimilar, components. They generally are in small areas and could not be mapped separately because of the scale used. Some small areas of strongly contrasting soils or miscellaneous areas are identified by a special symbol on the maps. If included in the database for a given area, the contrasting minor components are identified in the map unit descriptions along with some characteristics of each. A few areas of minor components may not have been observed, and consequently they are not mentioned in the descriptions, especially where the pattern was so complex that it was impractical to make enough observations to identify all the soils and miscellaneous areas on the landscape. Custom Soil Resource Report 8 The presence of minor components in a map unit in no way diminishes the usefulness or accuracy of the data. The objective of mapping is not to delineate pure taxonomic classes but rather to separate the landscape into landforms or landform segments that have similar use and management requirements. The delineation of such segments on the map provides sufficient information for the development of resource plans. If intensive use of small areas is planned, however, onsite investigation is needed to define and locate the soils and miscellaneous areas. An identifying symbol precedes the map unit name in the map unit descriptions. Each description includes general facts about the unit and gives important soil properties and qualities. Soils that have profiles that are almost alike make up a soil series. Except for differences in texture of the surface layer, all the soils of a series have major horizons that are similar in composition, thickness, and arrangement. Soils of one series can differ in texture of the surface layer, slope, stoniness, salinity, degree of erosion, and other characteristics that affect their use. On the basis of such differences, a soil series is divided into soil phases. Most of the areas shown on the detailed soil maps are phases of soil series. The name of a soil phase commonly indicates a feature that affects use or management. For example, Alpha silt loam, 0 to 2 percent slopes, is a phase of the Alpha series. Some map units are made up of two or more major soils or miscellaneous areas. These map units are complexes, associations, or undifferentiated groups. A complex consists of two or more soils or miscellaneous areas in such an intricate pattern or in such small areas that they cannot be shown separately on the maps. The pattern and proportion of the soils or miscellaneous areas are somewhat similar in all areas. Alpha-Beta complex, 0 to 6 percent slopes, is an example. An association is made up of two or more geographically associated soils or miscellaneous areas that are shown as one unit on the maps. Because of present or anticipated uses of the map units in the survey area, it was not considered practical or necessary to map the soils or miscellaneous areas separately. The pattern and relative proportion of the soils or miscellaneous areas are somewhat similar. Alpha-Beta association, 0 to 2 percent slopes, is an example. An undifferentiated group is made up of two or more soils or miscellaneous areas that could be mapped individually but are mapped as one unit because similar interpretations can be made for use and management. The pattern and proportion of the soils or miscellaneous areas in a mapped area are not uniform. An area can be made up of only one of the major soils or miscellaneous areas, or it can be made up of all of them. Alpha and Beta soils, 0 to 2 percent slopes, is an example. Some surveys include miscellaneous areas. Such areas have little or no soil material and support little or no vegetation. Rock outcrop is an example. Custom Soil Resource Report 9 Larimer County Area, Colorado 36—Fort Collins loam, 3 to 5 percent slopes Map Unit Setting National map unit symbol: jpw9 Elevation: 4,800 to 5,500 feet Mean annual precipitation: 13 to 15 inches Mean annual air temperature: 48 to 50 degrees F Frost-free period: 135 to 150 days Farmland classification: Prime farmland if irrigated Map Unit Composition Fort collins and similar soils: 90 percent Minor components: 10 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Fort Collins Setting Landform: Terraces, fans Landform position (three-dimensional): Base slope, riser Down-slope shape: Linear Across-slope shape: Linear Parent material: Alluvium Typical profile H1 - 0 to 9 inches: loam H2 - 9 to 20 inches: loam, clay loam H2 - 9 to 20 inches: loam, silt loam, fine sandy loam H3 - 20 to 60 inches: H3 - 20 to 60 inches: H3 - 20 to 60 inches: Properties and qualities Slope: 3 to 5 percent Depth to restrictive feature: More than 80 inches Natural drainage class: Well drained Runoff class: Low Capacity of the most limiting layer to transmit water (Ksat): Moderately high to high (0.60 to 2.00 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Calcium carbonate, maximum in profile: 15 percent Salinity, maximum in profile: Nonsaline to very slightly saline (0.0 to 2.0 mmhos/cm) Available water storage in profile: Very high (about 25.5 inches) Interpretive groups Land capability classification (irrigated): 3e Land capability classification (nonirrigated): 3e Hydrologic Soil Group: B Ecological site: Loamy Plains (R067XY002CO) Hydric soil rating: No Custom Soil Resource Report 10 Minor Components Ascalon Percent of map unit: 5 percent Hydric soil rating: No Kim Percent of map unit: 3 percent Hydric soil rating: No Stoneham Percent of map unit: 2 percent Hydric soil rating: No 49—Heldt clay loam, 3 to 6 percent slopes Map Unit Setting National map unit symbol: jpwr Elevation: 4,800 to 5,500 feet Mean annual precipitation: 13 to 15 inches Mean annual air temperature: 48 to 50 degrees F Frost-free period: 135 to 150 days Farmland classification: Farmland of statewide importance Map Unit Composition Heldt and similar soils: 85 percent Minor components: 15 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Heldt Setting Landform: Valley sides, fans Landform position (three-dimensional): Base slope Down-slope shape: Linear Across-slope shape: Linear Parent material: Clayey alluvium derived from shale Typical profile H1 - 0 to 4 inches: clay loam H2 - 4 to 60 inches: silty clay, clay loam, clay H2 - 4 to 60 inches: H2 - 4 to 60 inches: Properties and qualities Slope: 3 to 6 percent Depth to restrictive feature: More than 80 inches Natural drainage class: Well drained Runoff class: Very high Capacity of the most limiting layer to transmit water (Ksat): Moderately low to moderately high (0.06 to 0.20 in/hr) Custom Soil Resource Report 11 Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Calcium carbonate, maximum in profile: 10 percent Gypsum, maximum in profile: 5 percent Salinity, maximum in profile: Nonsaline to moderately saline (0.0 to 8.0 mmhos/cm) Sodium adsorption ratio, maximum in profile: 10.0 Available water storage in profile: Very high (about 27.6 inches) Interpretive groups Land capability classification (irrigated): 4e Land capability classification (nonirrigated): 4e Hydrologic Soil Group: C Hydric soil rating: No Minor Components Renohill Percent of map unit: 8 percent Hydric soil rating: No Ulm Percent of map unit: 7 percent Hydric soil rating: No 63—Longmont clay, 0 to 3 percent slopes Map Unit Setting National map unit symbol: jpx8 Elevation: 4,800 to 5,800 feet Mean annual precipitation: 13 to 15 inches Mean annual air temperature: 48 to 50 degrees F Frost-free period: 135 to 150 days Farmland classification: Prime farmland if irrigated and reclaimed of excess salts and sodium Map Unit Composition Longmont and similar soils: 85 percent Minor components: 15 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Longmont Setting Landform: Valleys, flood plains Landform position (three-dimensional): Base slope, tread Down-slope shape: Linear Across-slope shape: Linear Parent material: Clayey alluvium derived from shale Custom Soil Resource Report 12 Typical profile H1 - 0 to 60 inches: clay Properties and qualities Slope: 0 to 3 percent Depth to restrictive feature: More than 80 inches Natural drainage class: Poorly drained Runoff class: High Capacity of the most limiting layer to transmit water (Ksat): Moderately low to moderately high (0.06 to 0.20 in/hr) Depth to water table: About 24 to 30 inches Frequency of flooding: Occasional Frequency of ponding: None Calcium carbonate, maximum in profile: 15 percent Gypsum, maximum in profile: 5 percent Salinity, maximum in profile: Slightly saline to strongly saline (4.0 to 16.0 mmhos/cm) Sodium adsorption ratio, maximum in profile: 20.0 Available water storage in profile: Moderate (about 8.4 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 6w Hydrologic Soil Group: D Ecological site: Salt Meadow (R067BY035CO) Hydric soil rating: No Minor Components Heldt Percent of map unit: 5 percent Hydric soil rating: No Dacono Percent of map unit: 5 percent Hydric soil rating: No Aquolls Percent of map unit: 5 percent Landform: Swales Hydric soil rating: Yes 65—Midway clay loam, 5 to 25 percent slopes Map Unit Setting National map unit symbol: jpxb Elevation: 4,800 to 5,800 feet Mean annual precipitation: 13 to 15 inches Mean annual air temperature: 48 to 50 degrees F Frost-free period: 135 to 150 days Farmland classification: Not prime farmland Custom Soil Resource Report 13 Map Unit Composition Midway and similar soils: 90 percent Minor components: 10 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Midway Setting Landform position (three-dimensional): Side slope Down-slope shape: Linear Across-slope shape: Linear Parent material: Material weathered from shale Typical profile H1 - 0 to 4 inches: clay loam H2 - 4 to 19 inches: clay, clay loam, silty clay loam H2 - 4 to 19 inches: weathered bedrock H2 - 4 to 19 inches: H3 - 19 to 23 inches: Properties and qualities Slope: 5 to 25 percent Depth to restrictive feature: 6 to 20 inches to paralithic bedrock Natural drainage class: Well drained Runoff class: Very high Capacity of the most limiting layer to transmit water (Ksat): Moderately low to moderately high (0.06 to 0.20 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Calcium carbonate, maximum in profile: 15 percent Gypsum, maximum in profile: 15 percent Salinity, maximum in profile: Very slightly saline to moderately saline (2.0 to 8.0 mmhos/cm) Sodium adsorption ratio, maximum in profile: 15.0 Available water storage in profile: Moderate (about 7.9 inches) Interpretive groups Land capability classification (irrigated): 6e Land capability classification (nonirrigated): 6e Hydrologic Soil Group: D Ecological site: Shaly Plains (R067BY045CO) Hydric soil rating: No Minor Components Renohill Percent of map unit: 10 percent Hydric soil rating: No Custom Soil Resource Report 14 References American Association of State Highway and Transportation Officials (AASHTO). 2004. Standard specifications for transportation materials and methods of sampling and testing. 24th edition. American Society for Testing and Materials (ASTM). 2005. Standard classification of soils for engineering purposes. ASTM Standard D2487-00. Cowardin, L.M., V. Carter, F.C. Golet, and E.T. LaRoe. 1979. Classification of wetlands and deep-water habitats of the United States. U.S. Fish and Wildlife Service FWS/OBS-79/31. Federal Register. July 13, 1994. Changes in hydric soils of the United States. Federal Register. September 18, 2002. Hydric soils of the United States. Hurt, G.W., and L.M. Vasilas, editors. Version 6.0, 2006. Field indicators of hydric soils in the United States. National Research Council. 1995. Wetlands: Characteristics and boundaries. Soil Survey Division Staff. 1993. Soil survey manual. Soil Conservation Service. U.S. Department of Agriculture Handbook 18. http://www.nrcs.usda.gov/wps/portal/ nrcs/detail/national/soils/?cid=nrcs142p2_054262 Soil Survey Staff. 1999. Soil taxonomy: A basic system of soil classification for making and interpreting soil surveys. 2nd edition. Natural Resources Conservation Service, U.S. Department of Agriculture Handbook 436. http:// www.nrcs.usda.gov/wps/portal/nrcs/detail/national/soils/?cid=nrcs142p2_053577 Soil Survey Staff. 2010. Keys to soil taxonomy. 11th edition. U.S. Department of Agriculture, Natural Resources Conservation Service. http:// www.nrcs.usda.gov/wps/portal/nrcs/detail/national/soils/?cid=nrcs142p2_053580 Tiner, R.W., Jr. 1985. Wetlands of Delaware. U.S. Fish and Wildlife Service and Delaware Department of Natural Resources and Environmental Control, Wetlands Section. United States Army Corps of Engineers, Environmental Laboratory. 1987. Corps of Engineers wetlands delineation manual. Waterways Experiment Station Technical Report Y-87-1. United States Department of Agriculture, Natural Resources Conservation Service. National forestry manual. http://www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/ home/?cid=nrcs142p2_053374 United States Department of Agriculture, Natural Resources Conservation Service. National range and pasture handbook. http://www.nrcs.usda.gov/wps/portal/nrcs/ detail/national/landuse/rangepasture/?cid=stelprdb1043084 15 United States Department of Agriculture, Natural Resources Conservation Service. National soil survey handbook, title 430-VI. http://www.nrcs.usda.gov/wps/portal/ nrcs/detail/soils/scientists/?cid=nrcs142p2_054242 United States Department of Agriculture, Natural Resources Conservation Service. 2006. Land resource regions and major land resource areas of the United States, the Caribbean, and the Pacific Basin. U.S. Department of Agriculture Handbook 296. http://www.nrcs.usda.gov/wps/portal/nrcs/detail/national/soils/? cid=nrcs142p2_053624 United States Department of Agriculture, Soil Conservation Service. 1961. Land capability classification. U.S. Department of Agriculture Handbook 210. http:// www.nrcs.usda.gov/Internet/FSE_DOCUMENTS/nrcs142p2_052290.pdf Custom Soil Resource Report 16 = FORMULA CELLS = USER INPUT CELLS PROJECT: JOB NO.: CALC. BY: ▼ DATE: ▼ ▼ Minutes 5 10 20 30 40 50 60 120 Equation 5-1 I=(28.5*P1 )/(10+Td ) ^0.786 I = rainfall intensity (inches per hour) P1 = 1-hour point rainfall depth (inches) Td = storm duration (minutes) Reference: 1) Urban Drainage and Flood Control District - Urban Storm Drainage Criteria Manual Volume 1, 2017 2) Town of Gypsum, Public Works Manual, September 2015 http://hdsc.nws.noaa.gov/hdsc/pfds/pfds_map_cont.html?bkmrk=co 60.00 60.00 9.95 7.72 5.60 4.52 3.74 3.18 2.85 2.21 1.61 1.30 1.07 0.92 0.82 FORT COLLINS, CO Project Location P1: 1-hour Rainfall Depths (inches) BREEZE THRU HQ PL375 JKC 8/31/2018 IDF Rainfall Data 2-Year Minor Storm Major Storm Td 100-Year 0.49 1.84 2.86 Baseline Engineering, Planning and Surveying 8/30/2018 Copy of PL375_Breeze Thru_SF2 SF3_2018-08-31.xlsx PROJECT: JOB NO.: CALC. BY: DATE: Impervious Percentages - from Urban Drainage Table 6-3 Paved 100% 20% Drive and walks 100% 40% Roofs 90% 0 Lawns, sandy soil 10% 0 SOIL TYPE: C or D q (use equation from Table 6-4) = FORMULA CELLS = USER INPUT CELLS Basin Area (ac) Imp. C2 C5 C25 C100 Paved Drive and walks Roofs Lawns, sandy soil Lawns, clayey soil Gravel (packed) Land Use Land Use HISTORIC 1.56 83% 0.67 0.71 0.84 0.82 0.84 0.09 0.22 0.41 PROPOSED 1.56 78% 0.62 0.67 0.81 0.80 0.79 0.11 0.27 0.30 0.09 IMPRVMNTS 0.07 92% 0.76 0.79 0.90 0.86 0.01 0.06 Weighted Impervious and C Values Areas (ac) Lawns, clayey soil Gravel (packed) Land Use Land Use PROPOSED COMPOSITE IMPERVIOUSNESS Breeeze Thru PL375 JKC 8/31/2018 Baseline Engineering, Planning and Surveying COMPOSITE C VALUES - PROP 8/30/2018 Copy of PL375_Breeze Thru_SF2 SF3_2018-08-31.xlsx Project: Breeeze Thru Job No.: PL375 Calculated By: Checked By: N. Nemmers Date: FINAL REMARKS tc Basin i C5 AREA LENGTH SLOPE ti LENGTH SLOPE VEL. tt COMP. TOT. LENGTH So Ac Ft % Min Ft % FPS Min tc Ft % Min Min (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) (13) (14) (15) (16) HISTORIC 0.83 0.71 1.56 5.00 PROPOSED 0.78 0.67 1.56 5.00 IMPRVMNTS 0.92 0.79 0.07 5.00 STANDARD FORM SF-2 INITIAL/OVERLAND TIME (ti) JKC DATA SUB-BASIN 8/31/2018 tc (Equation 6-5) TIME OF CONCENTRATION SUMMARY tc CHECK (URBANIZED BASINS) TRAVEL TIME (tt) Cv Baseline Engineering, Planning and Surveying TOC 8/30/2018 Copy of PL375_Breeze Thru_SF2 SF3_2018-08-31.xlsx Calculated By: Project: Breeeze Thru Date: Job No.: PL375 Checked By: Design Storm: 25-Year = FORMULA CELLS = USER INPUT CELLS DESIGN POINT AREA DESIGN AREA (AC) RUNOFF COEFF tc (MIN) C * A (AC) I (IN/HR) Q (CFS) tc (MIN) S (C * A) (CA) I (IN/HR) Q (CFS) SLOPE (%) STREET FLOW DESIGN FLOW (CFS) SLOPE (%) PIPE DIAM. (IN.) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21) (22) HISTORIC 1.56 0.84 5.0 1.31 2.78 3.65 PROPOSED 1.56 0.81 5.0 1.26 2.78 3.50 IMPRVMNTS 0.07 0.90 5.0 0.06 2.78 0.17 STANDARD FORM SF-3 STORM DRAINAGE SYSTEM DESIGN (RATIONAL METHOD PROCEDURE) JKC 8/31/2018 NN 2-Year 0.82 1-hour rainfall= VELOCITY (FPS) tt (MIN) BASIN REMARKS DIRECT RUNOFF TOTAL RUNOFF STREET PIPE LENGTH (FT) Calculated By: Project: Breeeze Thru Date: Job No.: PL375 Checked By: Design Storm: 100-Year = FORMULA CELLS = USER INPUT CELLS DESIGN POINT AREA DESIGN AREA (AC) RUNOFF COEFF tc (MIN) C * A (AC) I (IN/HR) Q (CFS) tc (MIN) S (C * A) (CA) I (IN/HR) Q (CFS) SLOPE (%) STREET FLOW DESIGN FLOW (CFS) SLOPE (%) PIPE DIAM. (IN.) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21) (22) HISTORIC 1.56 0.82 5.0 1.29 9.70 12.5 PROPOSED 1.56 0.80 5.0 1.25 9.70 12.1 IMPRVMNTS 0.07 0.86 5.0 0.06 9.70 0.6 JKC STANDARD FORM SF-3 STORM DRAINAGE SYSTEM DESIGN (RATIONAL METHOD PROCEDURE) BASIN PIPE 8/31/2018 NN 2.86 100-Year 1-hour rainfall= tt (MIN) REMARKS DIRECT RUNOFF TOTAL RUNOFF STREET LENGTH (FT) PROJECT : PROJECT LOCATION: Fort Collins, CO DATE : PROJECT NO. : BY : Required Volume 1‐Hour Rainfall Tributary Area (ac) % Impervious Depth (100‐yr) Basin Slope (%) Basin Length (ft) 0.07 92.0% 2.86 3.0% 25.00 Soil Type % : A = 0.0% B = 0.0% C&D= 100.0% WQCV = 0.00 ac‐ft ( WQCV = 1.0*A*(0.91i 3 ‐1.19i 2 +0.78i)/12 ) WQCV = 105 cu‐ft EURV = 0.01 ac‐ft ( EURV = A((0.140i 1.28 )*A+(0.113i1.08)B%+(0.100i1.08)C%) EURV = 276 cu‐ft (INCLUDES WQCV) 100‐yr Detention = 0.01 ac‐ft (V100 =(P 1 ((0.067i 1.255 +0.009i 0.225 )A%+(0.364i 1.28 6+0.381i 0.286 )B% 100‐yr Detention = 491 cu‐ft +(0.306i 1.286 +0.402i 0.286 )C%)) * A) Total Required Volume = 0.01 ac‐ft (V100) = 491 cu‐ft Max Allowable Release Rate Q100 = 0.13 cfs (q= 2.09 cfs/ac ) Q=0.9aq (Equation 12‐5) Breeze Thru 8/31/2018 PL375 J. Carano Water Quality Capture Volume Calculations Sheet 1 of 1 Designer: Company: Date: Project: Location: 1. Design Discharge for 2-Year Return Period Q2 = 0.17 cfs 2. Hydraulic Residence Time A) : Length of Grass Swale LS = 115.0 ft B) Calculated Residence Time (based on design velocity below) THR= 8.6 minutes 3. Longitudinal Slope (vertical distance per unit horizontal) A) Available Slope (based on site constraints) Savail = 0.050 ft / ft B) Design Slope SD = 0.010 ft / ft 4. Swale Geometry A) Channel Side Slopes (Z = 4 min., horiz. distance per unit vertical) Z = 4.00 ft / ft B) Bottom Width of Swale (enter 0 for triangular section) WB = 3.00 ft 5. Vegetation A) Type of Planting (seed vs. sod, affects vegetal retardance factor) 6. Design Velocity (0.383 ft / s maximum for desirable 5-minute residence time) V2 = 0.22 ft / s 7. Design Flow Depth (1 foot maximum) D2 = 0.20 ft A) Flow Area A2 = 0.8 sq ft B) Top Width of Swale WT = 4.6 ft C) Froude Number (0.50 maximum) F = 0.10 D) Hydraulic Radius RH = 0.16 E) Velocity-Hydraulic Radius Product for Vegetal Retardance VR = 0.04 F) Manning's n (based on SCS vegetal retardance curve D for sodded grass) n = 0.200 G) Cumulative Height of Grade Control Structures Required HD = 4.60 ft AN UNDERDRAIN IS 8. Underdrain REQUIRED IF THE (Is an underdrain necessary?) DESIGN SLOPE < 2.0% 9. Soil Preparation (Describe soil amendment) 10. Irrigation Notes: Design Procedure Form: Grass Swale (GS) J. Carano Baseline Engineering August 30, 2018 Breeze Thru HQ South College Ave, Fort Collins, CO UD-BMP (Version 3.07, March 2018) Choose One Temporary Permanent Choose One Grass From Seed Grass From Sod Choose One YES NO PL375_Breeze Thru_UD-BMP_v3.07_2018-08-31.xlsm, GS 8/30/2018, 11:17 AM VELOCITY (FPS) Baseline Engineering, Planning and Surveying Major SF-3 8/30/2018 Copy of PL375_Breeze Thru_SF2 SF3_2018-08-31.xlsx Baseline Engineering, Planning and Surveying Minor SF-3 8/30/2018 Copy of PL375_Breeze Thru_SF2 SF3_2018-08-31.xlsx 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 12, Oct 10, 2017 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Mar 20, 2015—Oct 15, 2016 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. Custom Soil Resource Report 7