Drainage Report.pdf

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COMPREHENSIVE DRAINAGE ANALYSIS

Lot 2 Latigo Business Center Filing No. 1 (School District 49 Central Office Grounds)

10850 East Woodmen Road, Falcon, Colorado 80831

Prepared for:

DLR Group, Inc.

523 South Cascade Avenue, Suite 100 Colorado Springs, Colorado 80903

(719) 624-0205

Prepared by:

Kiowa Project No. 23051

January 15, 2025

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TABLE OF CONTENTS

Table of Contents Statements and Approvals I. Purpose II. General Location and Description

A. Location B. Description of Property – Existing Conditions C. Existing Soils D. Existing Drainage E. Description of Property – Proposed Conditions

III. Drainage Basins and Subbasins A. Existing Basins and Sub-Basins B. On-Site Basins – developed condition

IV. Drainage Design Criteria A. Regulations B. Development Criteria Reference and Constraints C. Hydrological Criteria D. Four-Step Process

V. Conclusions VI. References Appendix Table of Contents

List of Figures and Tables (Refer to the Appendix Table of Contents)

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STATEMENTS AND APPROVALS

ENGINEER'S STATEMENT:

The attached drainage plan and report were prepared under my direction and supervision and are correct to the best of my knowledge and belief. Said drainage report has been prepared according to the criteria established by the County for drainage reports and said report is in conformity with the master plan of the drainage basin. I accept responsibility for any liability caused by any negligent acts, errors or omissions on my part in preparing this report.

Kiowa Engineering Corporation, 1604 South 21st Street, Colorado Springs, Colorado 80904

Andrew W. McCord (PE #25057) Date For and on Behalf of Kiowa Engineering Corporation

DEVELOPER'S STATEMENT:

I, the Owner/Developer, have read and will comply with all of the requirements specified in this drainage report and plan.

School District 49 Name of Developer

Authorized Signature Date

Printed Name:

Title:

Address:

School District 49:

Filed in accordance with the requirements of the Drainage Criteria Manual, Volumes 1 & 2, El Paso County Engineering Criteria Manual, and Land Development Code, as amended.

School District 49 Date

Jan. 21, 2025

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I. PURPOSE

This report is a Comprehensive Drainage Analysis for Lot 2 Latigo Business Center Filing No. 1, located at 10850 East Woodmen Road, Falcon, Colorado 80831, for the redevelopment of the existing School District 49 Central Office Grounds.

The purpose of this report is to identify site drainage patterns and evaluate the site to meet water quality requirements per the runoff reduction standard.

II. GENERAL LOCATION AND DESCRIPTION

A. LOCATION

This proposed redevelopment is located on the School District 49 Central Office Grounds in El Paso County (Falcon, Colorado) within Lot 2 Latigo Business Center Filing No. 1 Subdivision. The parcel schedule number is 53010-02-006 and the legal description is Lot 2 Latigo Business Center Filing No 1. The parcel is located to the north of East Woodmen Road, west of Bent Grass Meadows Drive, east of Falcon Meadows Boulevard, and south of Kittrick Place. The parcel is addressed as 10850 East Woodmen Road.

The surrounding parcels are as follows:

7630 Bent Grass Meadow Drive, Schedule No. 53010-02-005, Zoning I-2, Plat No. R12007, Lot 1 Latigo Business Park Filing No. 1

7675 Falcon Meadow Boulevard, Schedule No. 53020-01-023, Zoning RR-5, Plat No. R05746, Lot 4 The Meadows Filing No. 1

7625 Falcon Meadow Boulevard, Schedule No. 53020-01-015, Zoning RR-5, Plat No. R05746, Lot 3 The Meadows Filing No. 1

7565 Falcon Meadow Boulevard, Schedule No. 53020-01-016, Zoning RR-5, Plat No. R05746, Lot 2 The Meadows Filing No. 1

7525 Falcon Meadow Boulevard, Schedule No. 53020-01-017, Zoning RR-5, Plat No. R05746, Lot 1 The Meadows Filing No. 1

B. DESCRIPTION OF PROPERTY – EXISTING CONDITIONS

Lot 2 Latigo Business Park Filing No. 1 Subdivision is approximately 443,715 square feet (10.19 acres) and is located on the north side of East Woodmen Road, west side of Bent Grass Meadow Drive, east of Falcon Meadows Boulevard, and south of Kittrick Place. The parcels fall within the Southwest Quarter of Section 1, Township 13 South, Range 65 West of the 6th Principal Meridian of El Paso County, Colorado.

The property currently consists of two buildings and unpaved parking lots in the northern portion of the site. There is existing curb and gutter along Bent Grass Meadow Drive and newly installed curb and gutter along East Woodmen Road.

The existing topography consists of grades between 2 and 25 percent and generally slopes from the north to south across the parcel.

C. EXISTING SOILS

The soils indicative to the site are classified as Columbine gravelly sandy loam and Blakeland loamy sand by the USDA Soil Conservation Service and are listed as National Resources Conservation Service (NRCS) Hydrologic Soil Group A. Group A soils have high

5 K i o w a E n g i n e e r i n g C o r p o r a t i o n infiltration rates and low runoff potential when thoroughly wetted. A United States Department of Agriculture (USDA) Soil Map is provided in the Appendix.

D. EXISTING DRAINAGE

The existing topography consists of grades between 2 and 25 percent and generally slopes from north to south across the parcel. Existing vegetation is limited to landscaped areas around the perimeter of the existing buildings.

Existing drainage patterns are generally characterized as overland flow. Site flows are directed southeast or southwest to minor swales along the western and eastern boundaries that release to landscape islands along the northside of East Woodmen Road. Flows are then directed east to existing curb and gutter along the west side of Bent Grass Meadow Drive. Runoff then flows north to an existing public 15’ CDoT Type R Curb Inlet located at the northwest corner of the intersection of East Woodmen Road and Bent Grass Meadow Drive.

This public storm inlet releases east to an open channel on the opposite (east) side of Bent Grass Meadow Drive. Flows continue east and ultimately outfall into Unnamed Tributary to Black Squirrel Creek approximately one thousand feet east of the site.

Lot 2 Latigo Business Center Filing No. 1 does not lie within a designated floodplain according to information published in the Federal Emergency Management Agency (FEMA) Floodplain Map No. 08041C0535G, dated December 7, 2018. The FEMA Floodplain map is provided in Appendix A showing it lies within Zone X, a minimal flood hazard zone.

There are no known non-stormwater discharges that contribute to the storm water systems on site and downstream, both private and public. There are no known drainage reports that impact the site’s drainage design.

E. DESCRIPTION OF PROPERTY – PROPOSED CONDITIONS

The proposed development consists of an addition to the existing warehouse, overlot grading to raise the northern portion of the site for construction of two new buildings, proposed new paved areas and concrete vee-pans, and new landscape areas for water quality treatment.

Planned access points to the site are unchanged at East Woodmen Road. No site access is planned for the east margin of the property from Bent Grass Meadow Drive.

III. DRAINAGE BASINS AND SUBBASINS

A. EXISTING BASINS AND SUB-BASINS

The parcel is delineated into two basins, West and East, according to the existing and proposed grading for the existing and developed conditions. Basins are delineated for the purpose of analyzing water quality treatment per the runoff reduction standard. Basin surface areas are identified as either Receiving Pervious Areas (RPA), Unconnected Impervious Areas (UIA), Directly Connected Impervious Areas (DCIA), or Separated Pervious Areas (SPA).

B. ON-SITE BASINS – DEVELOPED CONDITION

Basin W1 contains 1.05 acres of roof, paved, and lawn area. Runoff surface flows to a pervious area with a swale for water quality treatment. The swale releases south to Basin W2. Runoff reduction values for this basin are UIA=35,059 sf with the corresponding RPA=4,775 sf. The UIA/RPA interface width is 204 lf. There is also 3,253 sf of SPA.

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Basin W2 contains 0.53 acres of roof, paved, and lawn area. Runoff surface flows to a pervious landscape island with a meandering swale for water quality treatment. Flows release south to Basin W4a. Runoff reduction values for this basin are UIA=18,415 sf with the corresponding RPA=4,564 sf. The UIA/RPA interface width is 176 lf.

Basin W3 contains 0.29 acres of paved and lawn area. Runoff surface flows to a pervious landscape island for water quality treatment. Flows are then conveyed west by a concrete vee-pan to Basin W2. Runoff reduction values for this basin are UIA=9,371 sf with the corresponding RPA=2,216 sf. The UIA/RPA interface width is 174 lf.

Basins W4a, W4f, and W6 contain 0.99 acres of roof, paved and lawn area. Runoff from Basin W4a surface flows to a concrete vee-pan that conveys flows south to Basin W4f. Runoff from Basin W4f surface flows to concrete vee-pan and is conveyed south to Basin W6. Basin W6 is a pervious landscape island that treats flows from Basins W4a and W4f. Basin W6 runoff is self-tributary to a meandering swale that releases south to the East Woodmen Road Right of Way. Runoff reduction values for these basins are UIA=24,086 sf with the corresponding RPA=5,918 sf. The UIA/RPA interface width is 85 lf. There is also 11,507 sf of SPA.

Basin W4b contains 0.13 acres of paved and lawn area. Runoff surface flows to a pervious area for water quality treatment. Flows then release to the south to Basin W4a. Runoff reduction values for this basin are UIA=4,201 sf with the corresponding RPA=1,040 sf. The UIA/RPA interface width is 72 lf. There is also 400 sf of SPA.

Basin W4c contains 0.22 acres of paved and lawn area. Runoff surface flows to a pervious area for water quality treatment. Flows then release south to Basin W4d. Runoff reduction values for this basin are UIA=7,741 sf with the corresponding RPA=1,017 sf. The UIA/RPA interface width is 72 lf. There is also 1,024 sf of SPA.

Basin W4d contains 0.19 acres of paved and lawn area. Runoff surface flows to a pervious area for water quality treatment. Flows then release south to Basin W4f. Runoff reduction values for this basin are UIA=6,027 sf with the corresponding RPA=956 sf. The UIA/RPA interface width is 112 lf.

Basin W4e contains 0.58 acres of roof, paved, and lawn area. Runoff surface flows to a pervious area for water quality treatment. Flows then release south to Basin W4f. Runoff reduction values for this basin are UIA=8,326 sf with the corresponding RPA=1,110 sf. The UIA/RPA interface width is 112 lf.

Basin W5 contains 0.19 acres of paved and lawn area. Runoff surface flows to a pervious landscape island for water quality treatment. Flows then release south to Basin W8. Runoff reduction values for this basin are UIA=7,428 sf with the corresponding RPA=1,063 sf. The UIA/RPA interface width is 130 lf.

Basin W7 contains 0.23 acres of paved and lawn area. Runoff surface flows to a pervious landscape island for water quality treatment. Flows then release south to Basin W8. Runoff reduction values for this basin are UIA=8,227 sf with the corresponding RPA=1,944 sf. The UIA/RPA interface width is 130 lf.

Basin W8 contains 1.95 acres of roof, paved, and lawn area. Runoff flows to pervious areas around the existing buildings for water quality treatment and parking runoff surface flows to existing pervious landscape islands along the north side of East Woodmen Road for water quality treatment. Flows are then conveyed east to the existing inlet along the west side of Bent Grass Meadow Drive. Runoff reduction values for this basin are UIA=59,245 sf with the corresponding RPA=15,337 sf. The UIA/RPA interface width is 300 lf.

Basin E1 contains 0.11 acres of roof, paved, and lawn area. Runoff surface flows to a pervious landscape island and area for water quality treatment. Flows then release south to Basins E2 and E3.

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Runoff reduction values for this basin are UIA=3,375 sf with the corresponding RPA=459 sf. The UIA/RPA interface width is 40 lf. There is also 851 sf of SPA.

Basin E2 contains 0.13 acres of paved and lawn area. Runoff surface flows to a pervious area for water quality treatment. Flows then release south to Basins E3 and E4. Runoff reduction values for this basin are UIA=3,915 sf with the corresponding RPA=736 sf. The UIA/RPA interface width is 30 lf. There is also 891 sf of SPA.

Basin E3 contains 0.79 acres of roof, paved, and lawn area. Runoff surface flows to a pervious area for water quality treatment. Flows then release east to Basin E4. Runoff reduction values for this basin are UIA=27,948 sf with the corresponding RPA=3,684 sf. The UIA/RPA interface width is 256 lf.

Basin E4 contains 0.38 acres of roof, paved, and lawn area. Runoff surface flows to a pervious landscape island and area for water quality treatment. Flows then release south to Basin E7. Runoff reduction values for this basin are UIA=11,023 sf with the corresponding RPA=4,720 sf. The UIA/RPA interface width is 74 lf. There is also 583 sf of SPA.

Basin E5 contains 0.18 acres of paved and lawn area. Runoff surface flows to a pervious landscape island and area for water quality treatment. Flows then release south to Basin E6. Runoff reduction values for this basin are UIA=5,888 sf with the corresponding RPA=635 sf. The UIA/RPA interface width is 45 lf. There is also 1,098 sf of SPA.

Basin E6 contains 0.28 acres of roof, paved, and lawn area. Runoff surface flows to a pervious landscape island for water quality treatment. Flows then release south to Basin E7. Runoff reduction values for this basin are UIA=9,895 sf with the corresponding RPA=2,024 sf. The UIA/RPA interface width is 210 lf.

Basin E7 contains 0.24 acres of paved and lawn area. Runoff surface flows to a pervious landscape island for water quality treatment. Flows then release east to Basin E8. Runoff reduction values for this basin are UIA=8,323 sf with the corresponding RPA=1,188 sf. The UIA/RPA interface width is 101 lf.

Basin E8 contains 0.32 acres of paved and lawn area. Runoff surface flows to a pervious landscape island water quality treatment. Flows are conveyed south and release east to Bent Grass Meadow Drive via curb chases or level spreader. Flows continue south in existing curb and gutter to the existing inlet at the intersection with East Woodmen Road. Runoff reduction values for this basin are UIA=8,743 sf with the corresponding RPA=5,010 sf. The UIA/RPA interface width is 415 lf.

Basin E9 contains 0.24 acres of roof, paved, and lawn area. Runoff surface flows to a pervious area for water quality treatment. Flows then release east to Basin E10. Runoff reduction values for this basin are UIA=7,274 sf with the corresponding RPA=1,203 sf. The UIA/RPA interface width is 130 lf. There is also 1,957 sf of SPA.

Basin E10 contains 0.70 acres of roof, paved, and lawn area. Roof runoff discharges via downspouts to pervious areas for water quality treatment. Flows then converge with the remaining basin flows and are conveyed south by a concrete vee-pan to Basins E11 and E12. Runoff reduction values for this basin are UIA=28,551 sf with the corresponding RPA=1,147 sf. The UIA/RPA interface width is 50 lf. There is also 107 sf of SPA. To lessen potential icing along the eastern edge of the existing building, an alternative water quality treatment method would be to extend the existing downspouts to a manifold system that connects to a Stormcepter system that then discharges to an area inlet. Flows would ultimately release by ponding up through the inlet to the concrete vee-pan.

Basin E11 contains 0.18 acres of paved and lawn area. Runoff surface flows to a concrete vee-pan and is conveyed south to Basin E12. The runoff reduction value for this basin is 7,021 sf of SPA.

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Basin E12 contains 0.22 acres of roof, paved, and lawn area. Runoff flows to pervious areas around the existing buildings for water quality treatment. Flows then continue to a concrete vee-pan that conveys flows south to a proposed area inlet that connects via an 18” Reinforced Concrete Pipe (RCP) to the existing inlet at the intersection of Bent Grass Meadow Drive and East Woodmen Road. Runoff reduction values for this basin are UIA=4,986 sf with the corresponding RPA=4,130 sf. The UIA/RPA interface width is 120 lf.

IV. DRAINAGE DESIGN CRITERIA

A. REGULATIONS

Permanent Control Measures (PCMs) must be provided to achieve Water Quality Treatment. Refer to Green Infrastructure Exhibits in the Appendix for locations of treatment areas.

B. DEVELOPMENT CRITERIA REFERENCE AND CONSTRAINTS

The parcel falls within the Falcon Area Drainage Basin designated by El Paso County Engineering Division with the ultimate receiving waters being the Arkansas River by way of Black Squirrel and Fountain Creeks.

Water Quality Capture Volume (WQCV) runoff reduction was evaluated utilizing the Mile High Flood District (MHFD) spreadsheet UD-BMP v3.07.

Under developed conditions, the drainage on this parcel will have no effect on downstream infrastructure or facilities, streets, utilities, transit, or further development of adjacent lots.

C. HYDROLOGICAL CRITERIA

Rational Method runoff calculations have not been performed for existing or developed conditions. The site has solely been analyzed to meet the water quality runoff reduction standard.

Potential Best Management Practices (PBMPs) in the form of Planned Infiltration Areas (PIAs) are planned to achieve Water Quality Treatment.

D. FOUR-STEP PROCESS

The selection of appropriate control measures is based on the characteristics of the site and potential pollutants. The Four-Step Process provides a method of going through the selection process. The following applies the Four-Step Process to the development of Lot 2 Latigo Business Center.

Step 1: Employ Runoff Reduction Practices The site strategically locates pervious landscape islands and areas to treat unconnected impervious areas.

Given the proposed land use, the majority of the site consists of roof or paved surface. The UD-BMP spreadsheet was utilized to quantify the WQCV reduction percentage. The site globally achieves a WQCV reduction percentage of 60%. Runoff Reduction for the whole site is summarized in the table on the following page below:

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Water Quality Treatment Credit Value Summary Desig. S.F. Credit Acres % Site E1-E8 100988 77 2.318365 25.15 E9-12 56376 49 1.294215 14.04

W1-W4 151007 83 3.466644 37.60 W5-W8 93244 96 2.140588 23.22 Total sf: 401615 60 9.219812 100.00

Step 2: Provide Water Quality Capture Volume Volume water quality treatment is not required for the site, based on the site globally achieving the minimum WQCV reduction of 60% by the runoff reduction standard.

Step 3: Stabilize Drainageways The drainage within the site is stabilized with features such as grassed swales, valley pans, an area inlet, and sloped pavement to direct storm water through the site to East Woodmen Road and Bent Grass Meadow Drive Rights of Ways and ultimately to the public curb inlet at the intersection. There are no unstabilized drainageways on this site.

Step 4: Implement Site Specific and Other Source Control BMPs Site specific Potential Best Management Practices, pervious landscape islands and areas, are utilized to maximize opportunities for infiltration on-site.

V. CONCLUSIONS

The comprehensive drainage analysis for the redevelopment of Lot 2 Latigo Business Park has been evaluated to meet the water quality runoff reduction standard (minimum 60% reduction of the required WQCV) per MHFD Manual Volume 3 and corresponding spreadsheet. The design presented in this report reduces the required WQCV by 60%.

There is no impact on major drainageway planning studies within the larger drainage basin. This development will not adversely affect downstream development.

VI. REFERENCES

El Paso County & Colorado Springs Drainage Manual Volumes I & II (May 2014)

El Paso County Engineering Criteria Manual, El Paso County, Colorado, (Rev. 12/16/2013)

Urban Storm Drainage Criteria Manual, Vol. 1, 2 and 3, and Spreadsheets, Mile High Flood District, latest revisions.

Soil Survey of El Paso County Area, Colorado, prepared by United States Department of Agriculture Soil Conservation Service, dated June 1981.

FEMA Flood Online Map Service Center

United States Department of Agriculture National Resources Conservation Service

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APPENDIX TABLE OF CONTENTS

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APPENDIX A

Figure 1: Vicinity Map

Figure 2: Soils Map FEMA Flood Insurance Rate Map

To w ne rA ve

Woodmen Fontage Rd.

Ba nn in g

Red clo ud Pea k D r.

Tamlin Rd.

Ta m lin R d.

Highway 24Mc L aughlin

Rd.

Meridian Rd.

Fa lc on M ea do w s B lv d.

Bent Grass Meadows Dr.

Woodmen Hills Dr.

Rolling Thunder Way

M er id ia n Rd

Falcon Hwy.

Woodmen Rd.

Tompkins Rd.

10850 E. Woodmen Rd.

Vicinity MapKiowa Engineering Corporation

1604 South 21st Street Colorado Springs, Colorado 80904

(719) 630-7342

School District 49 - Grounds Expansion 10850 Woodmen Road - Colorado Springs, CO 80908

SCALE: 1"=2000'

0 2000'

Hydrologic Soil Group—El Paso County Area, Colorado

Natural Resources Conservation Service

Web Soil Survey National Cooperative Soil Survey

1/13/2025

532300 532350 532400 532450 532500 532550 532600

532300 532350 532400 532450 532500 532550 532600

38° 56' 38'' N

4°

7'

8' ' W

38° 56' 38'' N

4°

7'

5'

' W

38° 56' 25'' N

4°

7'

8'

' W

38° 56' 25'' N

4°

7'

5'

' W

N

Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 13N WGS84 0 50 100 200 300

Feet 0 25 50 100 150

Meters Map Scale: 1:2,000 if printed on A portrait (8.5" x 11") sheet.

Soil Map may not be valid at this scale.

MAP LEGEND MAP INFORMATION

Area of Interest (AOI) Area of Interest (AOI)

Soils Soil Rating Polygons

A

A/D

B

B/D

C

C/D

D

Not rated or not available

Soil Rating Lines A

A/D

B

B/D

C

C/D

D

Not rated or not available

Soil Rating Points A

A/D

B

B/D

C

C/D

D

Not rated or not available

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 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: El Paso County Area, Colorado Survey Area Data: Version 22, Sep 3, 2024

Soil map units are labeled (as space allows) for map scales 1:50,000 or larger.

Date(s) aerial images were photographed: Sep 11, 2018—Oct 20, 2018

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.

Hydrologic Soil Group—El Paso County Area, Colorado

Natural Resources Conservation Service

Web Soil Survey National Cooperative Soil Survey

1/13/2025

Hydrologic Soil Group

Map unit symbol Map unit name Rating Acres in AOI Percent of AOI

8 Blakeland loamy sand, 1 to 9 percent slopes

A 1.2 10.0%

19 Columbine gravelly sandy loam, 0 to 3 percent slopes

A 10.6 90.0%

Totals for Area of Interest 11.8 100.0%

Description

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.

Hydrologic Soil Group—El Paso County Area, Colorado

Natural Resources Conservation Service

Web Soil Survey National Cooperative Soil Survey

Rating Options

Aggregation Method: Dominant Condition

Component Percent Cutoff: None Specified

Tie-break Rule: Higher

Hydrologic Soil Group—El Paso County Area, Colorado

Natural Resources Conservation Service

Web Soil Survey National Cooperative Soil Survey

National Flood Hazard Layer FIRMette

0 500 1,000 1,500 2,000250 Feet

Ü

SEE FIS REPORT FOR DETAILED LEGEND AND INDEX MAP FOR FIRM PANEL LAYOUT

SPECIAL FLOOD

HAZARD AREAS

Without Base Flood Elevation (BFE) Zone A, V, A99

With BFE or Depth Zone AE, AO, AH, VE, AR

Regulatory Floodway

0.2% Annual Chance Flood Hazard, Areas of 1% annual chance flood with average depth less than one foot or with drainage areas of less than one square mile Zone X

Future Conditions 1% Annual Chance Flood Hazard Zone X

Area with Reduced Flood Risk due to Levee. See Notes. Zone X

Area with Flood Risk due to Levee Zone D

NO SCREEN Area of Minimal Flood Hazard Zone X

Area of Undetermined Flood Hazard Zone D

Channel, Culvert, or Storm Sewer

Levee, Dike, or Floodwall

Cross Sections with 1% Annual Chance

17.5 Water Surface Elevation

Coastal Transect

Coastal Transect Baseline Profile Baseline Hydrographic Feature

Base Flood Elevation Line (BFE)

Effective LOMRs

Limit of Study Jurisdiction Boundary

Digital Data Available

No Digital Data Available

Unmapped

This map complies with FEMA's standards for the use of digital flood maps if it is not void as described below.

The basemap shown complies with FEMA's basemap accuracy standards

The flood hazard information is derived directly from the authoritative NFHL web services provided by FEMA. This map was exported on 1/2/2025 at 8:21 PM and does not reflect changes or amendments subsequent to this date and time. The NFHL and effective information may change or become superseded by new data over time.

This map image is void if the one or more of the following map elements do not appear: basemap imagery, flood zone labels, legend, scale bar, map creation date, community identifiers, FIRM panel number, and FIRM effective date. Map images for unmapped and unmodernized areas cannot be used for regulatory purposes.

Legend

OTHER AREAS OF

FLOOD HAZARD

OTHER AREAS

GENERAL

STRUCTURES

OTHER

FEATURES

MAP PANELS

B 20.2

The pin displayed on the map is an approximate point selected by the user and does not represent an authoritative property location.

1:6,000

104°37'50"W 38°56'43"N

104°37'13"W 38°56'15"N

Basemap Imagery Source: USGS National Map 2023

Kiowa Engineering Corporat ion

APPENDIX B

Water Quality Calculations and Exhibit

Worksheet Unprotected

Sheet 1 of 1

Designer:

Company:

Date:

Project:

Location:

SITE INFORMATION (User Input in Blue Cells)

WQCV Rainfall Depth 0.60 inches

Depth of Average Runoff Producing Storm, d6 = 0.43 inches (for Watersheds Outside of the Denver Region, Figure 3-1 in USDCM Vol. 3)

Area Type UIA:RPA SPA UIA:RPA UIA:RPA UIA:RPA SPA UIA:RPA UIA:RPA UIA:RPA UIA:RPA SPA SPA

Area ID W1-RPA W1-SPA W2 W3 W4a,f+W6 W4a+W4f W4b-RPA W4c-RPA W4d-RPA W4e-RPA W4b-SPA W4c-SPA

Downstream Design Point ID na na na na na na na na na na na na

Downstream BMP Type None None None None None None None None None None None None

DCIA (ft2) -- -- -- -- -- -- -- -- -- -- -- --

UIA (ft2) 35,059 -- 18,415 9,371 24,086 -- 4,201 7,741 6,027 8,326 -- --

RPA (ft2) 4,775 -- 4,564 2,216 5,918 -- 1,040 1,017 956 1,110 -- --

SPA (ft2) -- 3,253 -- -- -- 11,507 -- -- -- -- 400 1,024

HSG A (%) 100% 100% 100% 100% 100% 100% 100% 100% 100% 100% 100%

HSG B (%) 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0%

HSG C/D (%) 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0%

Average Slope of RPA (ft/ft) 0.040 -- 0.045 0.070 0.020 -- 0.030 0.025 0.015 0.020 -- --

UIA:RPA Interface Width (ft) 204.00 -- 176.00 174.00 85.00 -- 72.00 72.00 112.00 112.00 -- --

CALCULATED RUNOFF RESULTS

Area ID W1-RPA W1-SPA W2 W3 W4a,f+W6 W4a+W4f W4b-RPA W4c-RPA W4d-RPA W4e-RPA W4b-SPA W4c-SPA

UIA:RPA Area (ft2) 39,834 -- 22,979 11,587 30,004 -- 5,241 8,758 6,983 9,437 -- --

L / W Ratio 0.96 -- 0.74 0.38 4.15 -- 1.01 1.69 0.56 0.75 -- --

UIA / Area 0.8801 -- 0.8014 0.8088 0.8028 -- 0.8016 0.8839 0.8631 0.8823 -- --

Runoff (in) 0.14 0.00 0.00 0.02 0.00 0.00 0.00 0.16 0.12 0.16 0.00 0.00

Runoff (ft3) 480 0 0 17 0 0 1 117 69 125 0 0

Runoff Reduction (ft3) 981 163 767 374 1004 575 174 205 182 222 20 51

CALCULATED WQCV RESULTS

Area ID W1-RPA W1-SPA W2 W3 W4a,f+W6 W4a+W4f W4b-RPA W4c-RPA W4d-RPA W4e-RPA W4b-SPA W4c-SPA

WQCV (ft3) 1461 0 767 390 1004 0 175 323 251 347 0 0

WQCV Reduction (ft3) 981 0 767 374 1004 0 174 205 182 222 0 0

WQCV Reduction (%) 67% 0% 100% 96% 100% 0% 99% 64% 73% 64% 0% 0%

Untreated WQCV (ft3) 480 0 0 17 0 0 1 117 69 125 0 0

CALCULATED DESIGN POINT RESULTS (sums results from all columns with the same Downstream Design Point ID)

Downstream Design Point ID na

DCIA (ft2) 0

UIA (ft2) 113,226

RPA (ft2) 21,596

SPA (ft2) 16,185

Total Area (ft2) 151,007

Total Impervious Area (ft2) 113,226

WQCV (ft3) 4,718

WQCV Reduction (ft3) 3,909

WQCV Reduction (%) 83%

Untreated WQCV (ft3) 808

CALCULATED SITE RESULTS (sums results from all columns in worksheet)

Total Area (ft2) 151,007

Total Impervious Area (ft2) 113,226

WQCV (ft3) 4,718

WQCV Reduction (ft3) 3,909

WQCV Reduction (%) 83%

Untreated WQCV (ft3) 808

18650 E Woodmen Rd, El Paso County, Co (Falcon) Areas W1 thru W4

Design Procedure Form: Runoff Reduction

AWMc

Kiowa Engineering Corporation

January 8, 2025

School District 49 Admin Campus

UD-BMP (Version 3.07, March 2018)

Designer:

Company:

Date:

Project:

Location:

SITE INFORMATION (User Input in Blue Cells)

WQCV Rainfall Depth 0.60 inches

Depth of Average Runoff Producing Storm, d6 = 0.43 inches (for Watersheds Outside of the Denver Region, Figure 3-1 in USDCM Vol. 3)

Area Type UIA:RPA UIA:RPA UIA:RPA

Area ID W5-RPA W7-RPA W8-RPA

Downstream Design Point ID na na na

Downstream BMP Type None None None

DCIA (ft2) -- -- --

UIA (ft2) 7,428 8,227 59,245

RPA (ft2) 1,063 1,944 15,337

SPA (ft2) -- -- --

HSG A (%) 100% 100% 100%

HSG B (%) 0% 0% 0%

HSG C/D (%) 0% 0% 0%

Average Slope of RPA (ft/ft) 0.055 0.070 0.040

UIA:RPA Interface Width (ft) 130.00 130.00 300.00

CALCULATED RUNOFF RESULTS

Area ID W5-RPA W7-RPA W8-RPA

UIA:RPA Area (ft2) 8,491 10,171 74,582

L / W Ratio 0.50 0.60 0.83

UIA / Area 0.8748 0.8089 0.7944

Runoff (in) 0.15 0.02 0.00

Runoff (ft3) 103 15 0

Runoff Reduction (ft3) 207 328 2469

CALCULATED WQCV RESULTS

Area ID W5-RPA W7-RPA W8-RPA

WQCV (ft3) 310 343 2469

WQCV Reduction (ft3) 207 328 2469

WQCV Reduction (%) 67% 96% 100%

Untreated WQCV (ft3) 103 15 0

CALCULATED DESIGN POINT RESULTS (sums results from all columns with the same Downstream Design Point ID)

Downstream Design Point ID na

DCIA (ft2) 0

UIA (ft2) 74,900

RPA (ft2) 18,344

SPA (ft2) 0

Total Area (ft2) 93,244

Total Impervious Area (ft2) 74,900

WQCV (ft3) 3,121

WQCV Reduction (ft3) 3,003

WQCV Reduction (%) 96%

Untreated WQCV (ft3) 118

CALCULATED SITE RESULTS (sums results from all columns in worksheet)

Total Area (ft2) 93,244

Total Impervious Area (ft2) 74,900

WQCV (ft3) 3,121

WQCV Reduction (ft3) 3,003

WQCV Reduction (%) 96%

Untreated WQCV (ft3) 118

18650 E Woodmen Rd, El Paso County, Co (Falcon) Areas W5, W7 and W8 (W6 Omitted as it is used elsewhere in calculation)

Design Procedure Form: Runoff Reduction

AWMc

Kiowa Engineering Corporation

January 8, 2025

Designer:

Company:

Date:

Project:

Location:

SITE INFORMATION (User Input in Blue Cells)

WQCV Rainfall Depth 0.60 inches

Depth of Average Runoff Producing Storm, d6 = 0.43 inches (for Watersheds Outside of the Denver Region, Figure 3-1 in USDCM Vol. 3)

Area Type UIA:RPA SPA UIA:RPA SPA UIA:RPA UIA:RPA SPA UIA:RPA SPA UIA:RPA UIA:RPA UIA:RPA

Area ID E1-RPA E1-SPA E2-RPA E2-SPA E3-RPA E4-RPA E4-SPA E5-RPA E5-SPA E6 E7 E8

Downstream Design Point ID na na na na na na na na na na na na

Downstream BMP Type None None None None None None None None None None None None

DCIA (ft2) -- -- -- -- -- -- -- -- -- -- -- --

UIA (ft2) 3,375 -- 3,915 -- 27,948 11,023 -- 5,888 -- 9,895 8,323 8,743

RPA (ft2) 459 -- 736 -- 3,684 4,720 -- 635 -- 2,024 1,188 5,010

SPA (ft2) -- 851 -- 891 -- -- 583 -- 1,098 -- -- --

HSG A (%) 100% 100% 100% 100% 100% 100% 100% 100% 100%

HSG B (%) 0% 0% 0% 0% 0% 0% 0% 0% 0%

HSG C/D (%) 0% 0% 0% 0% 0% 0% 0% 0% 0%

Average Slope of RPA (ft/ft) 0.050 -- 0.045 -- 0.042 0.044 -- 0.048 -- 0.016 0.050 0.050

UIA:RPA Interface Width (ft) 40.00 -- 30.00 -- 256.00 74.00 -- 45.00 -- 210.00 101.00 415.00

CALCULATED RUNOFF RESULTS

Area ID E1-RPA E1-SPA E2-RPA E2-SPA E3-RPA E4-RPA E4-SPA E5-RPA E5-SPA E6 E7 E8

UIA:RPA Area (ft2) 3,834 -- 4,651 -- 31,632 15,743 -- 6,523 -- 11,919 9,511 13,753

L / W Ratio 2.40 -- 5.17 -- 0.48 2.87 -- 3.22 -- 0.27 0.93 0.08

UIA / Area 0.8802 -- 0.8418 -- 0.8835 0.7002 -- 0.9026 -- 0.8302 0.8751 0.6357

Runoff (in) 0.15 0.00 0.07 0.00 0.16 0.00 0.00 0.20 0.00 0.05 0.14 0.00

Runoff (ft3) 49 0 27 0 410 0 0 110 0 52 115 0

Runoff Reduction (ft3) 91 43 136 45 754 459 29 136 55 360 232 364

CALCULATED WQCV RESULTS

Area ID E1-RPA E1-SPA E2-RPA E2-SPA E3-RPA E4-RPA E4-SPA E5-RPA E5-SPA E6 E7 E8

WQCV (ft3) 141 0 163 0 1164 459 0 245 0 412 347 364

WQCV Reduction (ft3) 91 0 136 0 754 459 0 136 0 360 232 364

WQCV Reduction (%) 65% 0% 83% 0% 65% 100% 0% 55% 0% 87% 67% 100%

Untreated WQCV (ft3) 49 0 27 0 410 0 0 110 0 52 115 0

CALCULATED DESIGN POINT RESULTS (sums results from all columns with the same Downstream Design Point ID)

Downstream Design Point ID na

DCIA (ft2) 0

UIA (ft2) 79,110

RPA (ft2) 18,456

SPA (ft2) 3,422

Total Area (ft2) 100,988

Total Impervious Area (ft2) 79,110

WQCV (ft3) 3,296

WQCV Reduction (ft3) 2,533

WQCV Reduction (%) 77%

Untreated WQCV (ft3) 763

CALCULATED SITE RESULTS (sums results from all columns in worksheet)

Total Area (ft2) 100,988

Total Impervious Area (ft2) 79,110

WQCV (ft3) 3,296

WQCV Reduction (ft3) 2,533

WQCV Reduction (%) 77%

Untreated WQCV (ft3) 763

18650 E Woodmen Rd, El Paso County, Co (Falcon) Areas E1 thru E8

Design Procedure Form: Runoff Reduction

AWMc

Kiowa Engineering Corporation

January 8, 2025

Designer:

Company:

Date:

Project:

Location:

SITE INFORMATION (User Input in Blue Cells)

WQCV Rainfall Depth 0.60 inches

Depth of Average Runoff Producing Storm, d6 = 0.43 inches (for Watersheds Outside of the Denver Region, Figure 3-1 in USDCM Vol. 3)

Area Type UIA:RPA SPA UIA:RPA SPA SPA UIA:RPA

Area ID E9-RPA E9-SPA E10-RPA E10-SPA E11-SPA E12-RPA

Downstream Design Point ID na na na na na na

Downstream BMP Type None None None None None None

DCIA (ft2) -- -- -- -- -- --

UIA (ft2) 7,274 -- 28,551 -- -- 4,986

RPA (ft2) 1,203 -- 1,147 -- -- 4,130

SPA (ft2) -- 1,957 -- 107 7,021 --

HSG A (%) 100% 100% 100% 100% 100%

HSG B (%) 0% 0% 0% 0% 0%

HSG C/D (%) 0% 0% 0% 0% 0%

Average Slope of RPA (ft/ft) 0.055 -- 0.010 -- -- 0.020

UIA:RPA Interface Width (ft) 130.00 -- 50.00 -- -- 120.00

CALCULATED RUNOFF RESULTS

Area ID E9-RPA E9-SPA E10-RPA E10-SPA E11-SPA E12-RPA

UIA:RPA Area (ft2) 8,477 -- 29,698 -- -- 9,116

L / W Ratio 0.50 -- 11.88 -- -- 0.63

UIA / Area 0.8581 -- 0.9614 -- -- 0.5470

Runoff (in) 0.11 0.00 0.32 0.00 0.00 0.00

Runoff (ft3) 78 0 783 0 0 0

Runoff Reduction (ft3) 225 98 406 5 351 208

CALCULATED WQCV RESULTS

Area ID E9-RPA E9-SPA E10-RPA E10-SPA E11-SPA E12-RPA

WQCV (ft3) 303 0 1190 0 0 208

WQCV Reduction (ft3) 225 0 406 0 0 208

WQCV Reduction (%) 74% 0% 34% 0% 0% 100%

Untreated WQCV (ft3) 78 0 783 0 0 0

CALCULATED DESIGN POINT RESULTS (sums results from all columns with the same Downstream Design Point ID)

Downstream Design Point ID na

DCIA (ft2) 0

UIA (ft2) 40,811

RPA (ft2) 6,480

SPA (ft2) 9,085

Total Area (ft2) 56,376

Total Impervious Area (ft2) 40,811

WQCV (ft3) 1,700

WQCV Reduction (ft3) 839

WQCV Reduction (%) 49%

Untreated WQCV (ft3) 862

CALCULATED SITE RESULTS (sums results from all columns in worksheet)

Total Area (ft2) 56,376

Total Impervious Area (ft2) 40,811

WQCV (ft3) 1,700

WQCV Reduction (ft3) 839

WQCV Reduction (%) 49%

Untreated WQCV (ft3) 862

18650 E Woodmen Rd, El Paso County, Co (Falcon) Areas E9 thru E12

Design Procedure Form: Runoff Reduction

AWMc

Kiowa Engineering Corporation

January 8, 2025

Water Quality Treatmment Credit Value Summary

Desig. S.F. Credit Acres % Site

E1-E8 100988 77 2.318365 25.15

E9-12 56376 49 1.294215 14.04

W1-W4 151007 83 3.466644 37.60

W5-W8 93244 96 2.140588 23.22

Total SF: 401615 60 9.219812 100.00

LEGENDLEGEND

-2.3%

-25.1%

-0.1%

.9

-3.9%

-3.3%

2.5%

-3.3%

-5.0%

.7

3.2%

-5.7%

-5.2%

-4.

3%

-3.0

-2.7%

-3.0%

-2.

3%

-2.9% .9

-6.5%

-4.1%

-2.4%

-3.4%

.4

.7

.4

.2

3.1%

-1.7%

-1.5%

-2.1%

-2.0%

-2.6%

-2.2%

-3.3%

-2.8%

-3.1%

-2.0

-2.6%

3.8%

3.4%

.1

.0

.2

.7

.4

.0

.9

.2

.5 % -4.7%

.1

-5.1%

-2.3%

-1.7%

-2.0%

-2.4%

-2.5%

-3.0%

-2.6%

-3.7%

-3.7%

.0

-0.7%

-1.0%

-1.0%

-1.0%

-4.9%

.2

-1.6%

-1.6%

-3.0%

-2.3%

-3.5%

-4.7%

-3.5%

-5.6%

-5.2

.6

-1.3%

5.3%

.8

-3.2%

-1.

8%

.0

-1.7%

-1.6%

-1.0%

0.5%

-1.9%

-2.0%

-0.7%

-1.3%

-2.6%

.8

-6.2%

.2

.9

-1.1%

-2.0%

-0.7%

.4

-1.1%

-1.1%

.8

.0

-2.1%

2.8%

-5.2%

-9.5%

.4

.3

-2.3%- 3.0%

-4.3%

-4.1%

-3.5%

-1.9%

-1.

9%

-4.4%

.5

-3.4%

.9

-2.0%

.3

.2

.7

-1.1%

.0

1.6%

-0.7%

-7.3%

-14.4%

.8

-3.2%

-7.5%

.5

.9

.1

.1

.8

.1

.1

.7 .6

2.8%

4.3%

5.6%

8.6%

.1

-1.4%

-0.6%

.7

-9.7%

-6.6%

-10.0%

-5.1%

-3.6%

-1.8%

-4.7%

-6.5%

3.0%

-3.6%

-5.5%

-2.5%

Broad Asphalt Swale

200 s.f.

Sed. Trap.

W attles

50' Level Spreader and/or 3 Curb Chases (Release to Public Roadway Flowline)

Wattles

Wattles

W attles

W attles

Check Dam

Check Dam

Check Dam x

LP

x

LP

x

LP

x LP x

Wattles x

LP

x LPx

LP

Wattles

6,000 s.f.

Ex. Landscape Island

(to rem ain)

Seeding & Mulching Seeding & Mulching

Broad Asphalt Swale

N ew

4'∅ Puvlic M

H Rim

6901.0

N ew

Area Inlet Grate

6902.0

Connect to Rear Side of Ex.

Public Curb Inlet

300' of Vertical Cheek W all (6-15")

(485 Face Feet to Bottom of Concrete)

W attles

W attles

New Public 35 LF

18" RCP Pipe

N ew

4 LF

18" RCP Pipe

Trans. to 6' Vee-Pan w/ 2" Depression

Broad Asphalt Swale

W attles

2,000 s.f. Landscape Shallow

Depression (12" M ax Depth)

W attles

Wattles

W attles

Wattles Wattles

W attles

Check Dam

Check Dam

Check Dam x x

LP

x

W attles xLP

Wattles

1,250 s.f. Landscape Shallow Depression

(Perc. Zone w Shade Trees) x

LP

x LPx

LP

5,000 s.f.

Landscape Island

(Perc. Zone) (Optional Shade Trees)

7,000 s.f.

Ex. Landscape Island

(to rem ain)

Seeding & Mulching Seeding & Mulching

Broad Asphalt Swale

W attles

Ex Area Inlet

12,000 s.f.± Stabilized Mulch (i.e. Aggregate) x LP

7,000 s.f. Landscape Island (Perc. Zone &

Optional Shade Trees)

W attles

Wattles

Proposed Building Area

200 s.f.

PR Sed. Trap 2

300 s.f.

PR Sed. Trap 3

200 s.f.

Sed. Trap 4

PR Landscape Area - 3,529 s.f.

PR Landscape Area - 3,529 s.f.

PR Stabilized Aggregate Area - 12,076 s.f.

Existing Warehouse W 12 Roof Area 14,154 s.f.

Ex Conc Area 3

3,027 s.f.

Ex Conc Area 4 4,326 s.f.

(Includes Walk)

W arehouse

Addition Roof Area 3,850 s.f.

Ex Conc Area 1 2,941 s.f.

Ex Conc Area 2

1,235 s.f.

Exisiting Asphalt - 56,048 s.f.

PR Stab. Agg.

841 s.f.

- Ex Admin Area - Ex Roof Area (All) - 17,512 s.f.

Ex Conc Area (All) - 3,570 s.f.

Vee Pan Concrete Pan 6,244 s.f.

(Both,Total)

PR Landscape Area - 1,733 s.f.

PR Landscape - 5,431 s.f.

Vee Pan Concrete Pan 6,244 s.f. (Both,Total)

W5

W7

E8

E10

E11

W8

W6

H P x x LP x LP

Existing Warehouse E 12 Roof Area 12,967 s.f.

x LP x LP x LP x LP x LP x LP x LP x LP x LP x LP x

LP

x

LP

x

LP

W4a

W4b

W4c

W4d

W4e

W4f

E9

E12

W4f

W4a x LP x LP x LP

W oodm en Frontage Road

Bent Grass Meadows Drive

4'-Wide Concrete Vee-Pan Swale 6" Conc.

4'-Wide Concrete Vee-Pan

1" Depression / 6" Conc.

Transition 4' Pans to 8' Pan

4'-Wide Concrete Vee-Pan 6" Conc.

4'-Wide Concrete Vee-Pan 1" Depression / 6" Conc.

See Cheek Wall Detail Sheet C1-3 8" Width and 12" Bury Depth

Downspout Downspout xH P xH P xH P xH P xH P

Bent Grass Meadows Drive

New Extended Downspout

DRAINAGE LEGEND

Color Legend for IRF Calculation

LPx

HPx

E(n)

D

LR

G ro up

Site Grading & Erosion Control

G R

AD

IN

G

E R

O

SI

O N

C O

N

TR

O L

PL

AN

(S ou th H al f)

SCALE: 1"=20'

0 20' 40'

Kiowa: 23051

K io w a

E n g in e e r in g C o r p o r a ti o n

S o u th s t

S tr e e t C o lo ra d o S p ri n g s C o lo ra d o

(7

-7

D

LR

G ro up

REVISIONS

A B C D E F

37-24108-00

09.04.2024

D4

CE

NT

RA

L

OF

FI

CE

G

RO

UN

DS

CONSTRUCTION

DOCUMENTS

GREEN

INFRASTRUCTURE

PLAN

GI 1

E

W O

O D

M

EN

R D

FA

LC

O

N , C

O

11.25.2024 Clarifications

SE

E

SH

EE

T

GI

.9

-2.8% -3.0

-2.5%

-1.8% -2.7%

-3.9%

-2.7%

-2.0%

-2.9%

-3.3%

2.5%

-3.1%

-3.3%

-4.2%

-5.3%

-7.6%

-2.7%

-3.3%

-5.0%

-3.0%

-2.1%-2.8%

.7

3.2%

-5.7%

-5.2%

-4.

3%

-3.0

-2.7%

-3.0%

-2.9% .9

-6.5%

-4.1%

-2.4%

-3.4%

3.1%

-1.7%

-2.3% 4.1%

-2.5% .0

-2.6% .9

.0

-0.5%

-1.8%

-5.8%

-1.3%

-4.2

-3.1%

-2.1%

.8

-3.2%

-2.2% - .4

.3

.7

-5.2%

-4.2%-3.9%

-6.5%

3.0%

-3.6%

-5.5%

-2.5%

50' Level Spreader and/or 3 Curb Chases (Release to Public Roadway Flowline)

2,500 s.f.

Side Lot Swale

(Plantings Optional) x

LP

x LP

Wattles

W attles

W attles

Wattles

300' of Vertical Cheek W all (6-15")

(485 Face Feet to Bottom of Concrete)

W attles

W attles

Wattles

3,000 s.f.± Stabilized M ulch (i.e. Aggregate)

3,000 s.f.± Stabilized M ulch (i.e. Aggregate)

Side Lot Swale (Plantings Optional)

4,000 s.f.

Landscape Island

Form Shallow Meandering Swale (Perc. Zone

Optional Shade Trees)

Wattles x xx LP

LP

LP

x

Wattles

W attles

W attles

W attles

Wattles

Wattles Wattles

W attles

3,000 s.f.± Stabilized M ulch (i.e. Aggregate)

W attles

W attles

7,000 s.f. Landscape Island (Perc. Zone &

Optional Shade Trees)

W attles

Wattles

Proposed Building Area

-3.1%

300 s.f.

PR Sed. Trap 3

200 s.f.

Sed. Trap 4

W 12 PR Covered Pkg Rooftop 12,929 s.f.

E 12 PR Covered Pkg Rooftop 12,929 s.f.

W 12 PR East Barn Rooftop 4,847 s.f.

E 12 PR East Barn Rooftop 4,852 s.f.

PR Conc Area - 1,258 s.f.PR Conc Area - 1,250 s.f.

East Barn PR Landscape Area 4,442 s.f.

South Barn Conc Stoops 153 s.f. total

Barn Conc Stoops 178 s.f. total

PR Landscape Area 8 - 4,810 s.f.

PR Landscape Area 7 - 4,102 s.f.

PR Landscape Area - 3,529 s.f.

PR Landscape Area - 3,529 s.f.

W arehouse

Addition Roof Area 3,850 s.f.

PR Conc Area

550 s.f.

PR Conc Area

550 s.f.

PR Conc Area

630 s.f.

Vee Pan Concrete Pan 6,244 s.f.

(Both,Total)

East Barn PR Landscape Area 2,203 s.f. (Both)

PR Covered Pkg Lndscp South (Both) 487 s.f.

PR Covered Pkg Lndscp North (Both) 250 s.f. each

PR Conc Area - 1,258 s.f.PR SW Conc Area - 1,250 s.f.

6,000 s.f. Landscape Islands (Shallow Percolation Zones

Optional Shade Trees)

2,500 s.f.± Landscape Island Receiving Pervious Area for Roof Flows

W1

W2

W3

E2

E4

E5

E8E8

H P x

H P x

H P x

H Px

H P x

H P x

E1

E3

E3

E4

E6

E7x LP x LP x LP x LPW4a

W4b

W4c

E9

4'-Wide Concrete Vee-Pan Swale 6" Conc.

4'-Wide Concrete Vee-Pan 6" Conc.

See Cheek Wall Detail Sheet C1-3 8" Width and 12" Bury Depth

DownspoutDownspoutDownspoutDownspoutDownspoutDownspout

DownspoutDownspoutDownspoutDownspoutDownspoutDownspout

Downspout DownspoutDownspoutDownspout

Downspout

Downspout

Downspout

Downspout Downspout Downspout Downspout xH P xH P xH P xH P xH P Downspout

Bent Grass Meadows Drive

DRAINAGE LEGEND

Color Legend for IRF Calculation

LPx

HPx

E(n)

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