STORM WATER MANAGEMENT STUDY. Johnson County Park and Recreation District Verhaeghe Park
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1 STORM WATER MANAGEMENT STUDY Johnson County Park and Recreation District Verhaeghe Park Prepared By: The Clark Enersen Partners 1251 NW Briarcliff Parkway, Suite 400 Kansas City, MO October, 2017
2 Location This drainage study has been prepared for the Johnson County Park and Recreation District Verhaeghe Park project. The project is located south of the future intersection of 167 th and Flint in Overland Park, KS. Pre-Development Site Description The pre-development conditions include an open natural grass field. The south 1/4 of the site drains towards the south into Coffee Creek. The north 3/4 of the site drains towards the east into Coffee Creek via a 24 concrete reinforced pipe culvert (Existing Pipe 1). The northern 2/3 of the site is located within the 100-year flood plain (Zone AE) of Coffee Creek. The southern 1/3 of the site is located within the floodway of Coffee Creek. See Exhibit A for plans of the existing site conditions (note: plans included in report are not to scale shown). Post Development Site Description The post development site includes a paved parking lot, park shelter, playground, maintained turf areas and preserved open natural grass areas. The existing drainage patterns have been preserved as best as possible. Post Development Storm Water Management Design Chapter , paragraph A states detention is not required on the site when such flooding occurs within a Special Flood Hazard Area, as defined in and the watershed is greater than 5,000 acres. The subject site is in a Special Flood Hazard Area (it s located in a Zone AE) and the watershed is greater than 5,000 acres (Coffee Creek upstream of the site drains a watershed area of +/-7,500 acres). Therefore, no detention has been provided on the site. Existing Pipe 1, Native Vegetated Swale 1, Swale 2 and Swale 3 have been designed to carry runoff from the 10 year 24-hour storm. The post storm water system has also been designed to meet MARC storm water quality requirements. This is accomplished through Native Vegetated Swale 1 and preserved/ established natural areas. See Sheet Exhibits B, C and D for plans and storm water calculations of the proposed conditions. (note: plans included in report are not to scale shown).
3 EXHIBIT A Existing Conditions Plans
4 Plot Time Stamp: 10 / 25 / :53:45 PM File Location/Name: \\Tcep-kc-srv-004\ \ JCPRD Verhaeghe Park\3) Active Work\3) AutoCAD\ S0.dwg TRACT C 167TH ST. SITE EXISTING CONDITIONS PLAN SCALE: 1"=40'-0" COFFEE CREEK CONTOURS NORTH OF SITE BASED ON PROPOSED CONTOURS OF 167TH STREET PROJECT (CURRENTLY UNDER CONSTRUCTION) FLINT STREET (CURRENTLY UNDER CONSTRUCTION) 167TH STREET ELEV: +/ EXISTING INLET ELEV: +/ EXISTING INLET TO REMAIN EXISTING PIPE 1 EXISTING 24" RCP S S Architecture Landscape Architecture Engineering Interiors Fairway, Kansas 2812 W. 53rd Street Fairway, KS Lincoln, Nebraska Kansas City, Missouri Preliminary and Final Development Plans Johnson County Park & Recreation District Verhaeghe Park 167th and Flint Streets Overland Park, Kansas TCEP No.: JCPRD No.: PRK October 25, 2017 Site Existing Conditions Plan S0
5 EXHIBIT B Proposed Plans
6 Plot Time Stamp: 10 / 25 / :31:22 PM File Location/Name: \\Tcep-kc-srv-004\ \ JCPRD Verhaeghe Park\3) Active Work\3) AutoCAD\ S2.dwg EXISTING ASPHALT TRAIL PROPERTY LINE EXISTING TREELINE SITE LAYOUT PLAN SCALE: 1"=40'-0" GENERAL NOTES PARCEL ID: NP T0C ZONING: RURJ SIZE: ACRES PARKING: 54 STALLS, INCLUDING 4 ADA 1. ALL TRASH DUMPSTERS WILL BE HOUSED OFF-SITE 2. NO SITE LIGHTING WILL BE PROVIDED, AS THE PARK WILL ONLY BE OPEN DURING DAYLIGHT HOURS. 40' SANITARY EASEMENT EXISTING TREELINE 160' PROPERTY LINE MULTI-PURPOSE TURF FIELD ±350' FUTURE 167TH STREET 167TH STREET R.O.W. FUTURE 167TH STREET R30' CURB AND GUTTER, TYP 54-STALL PARKING LOT (INCL 4 ADA STALLS) PARK ENTRANCE SIGN, REF SHEET A.1 FOR ELEVATION COMMUNITY GARDEN PLOTS SIDEWALK GRATES TO ALLOW DRAINAGE TRAIL CONNECTION EXISTING ASPHALT TRAIL ±70' 18' 24' 18' 7' 30'W PIPE GATE, TO BE LOCKED OVERNIGHT BY PARK STAFF PERIMETER 4'H CHAIN LINK FENCE ±90' 35' 5' 20'R 10' PROPERTY LINE FLINT STREET (CURRENTLY UNDER CONSTRUCTION) 7' 60.00' CURB RAMP PER CITY STANDARDS AT STREET 10'x18' PORTABLE RESTROOM SHELTER WITH CONC BASE, REF SHEET A.1 FOR ELEVATIONS FREESTANDING SEGMENTAL SEAT WALL 24'x44' PICNIC SHELTER WITH CONCRETE BASE, REF SHEET A.1 FOR ELEVATIONS BOARDWALK/ BRIDGE OVER STF PLAY EQUIPMENT LOCATION WITH POURED-IN-PLACE RUBBER PLAY SURFACING OVER CONCRETE BASE 10' SIDEWALKS, TYP ' EXISTING ASPHALT TRAIL TRAIL CONNECTION 96.08' PROPERTY LINE EXISTING TREELINE 40' SANITARY EASEMENT 6' 6' 6' 99.41' 24' 18' 10' 20'R (CURRENTLY UNDER CONSTRUCTION) 167TH STREET S S Architecture Landscape Architecture Engineering Interiors Fairway, Kansas 2812 W. 53rd Street Fairway, KS Lincoln, Nebraska Kansas City, Missouri Preliminary and Final Development Plans Johnson County Park & Recreation District Verhaeghe Park 167th and Flint Streets Overland Park, Kansas TCEP No.: JCPRD No.: PRK October 25, 2017 Site Layout Plan S.2
7 Plot Time Stamp: 10 / 25 / :36:34 PM File Location/Name: \\Tcep-kc-srv-004\ \ JCPRD Verhaeghe Park\3) Active Work\3) AutoCAD\ L1.dwg LANDSCAPE PLAN SCALE: 1"=40'-0" PLANTING PLAN NOTES: 1. SEED IS PROPOSED FOR ALL TURF AREAS DISTURBED DURING CONSTRUCTION 2. BASED ON A FRONTAGE OF 1063 FEET, A TOTAL OF 27 STREET TREES ARE SHOWN 3. IRRIGATION IS NOT PROVIDED ON SITE, HOSE BIB LOCATIONS ARE SHOWN PLANT LIST SYMBOL BOTANICAL NAME COMMON NAME SIZE & METHOD OF HANDLING EXISTING TREELINE TO REMAIN AHOWN DESIGN HEIGHT & SPREAD TREES AAB AMELANCHIERxGRANDIFLORA'AUTUMNBRILIANCE' AUTUMNBRILIANCESERVICEBERRY 1 2"CAL/B&B/8'HTMIN/SINGLE-STEMMED 20' HEIGHT, 15' SPREAD AFJ ACER x FREEMANII 'JEFFERSRED' AUTUMN BLAZE MAPLE 2" CAL / B&B / 12' HT MIN 45' HEIGHT, 35' SPREAD GTI GLEDITSIA TRIACANTHOS 'IMPCOLE' IMPERIAL HONEYLOCUST 2 1/2" CAL / B&B / 12' HT MIN 35' HEIGHT, 35' SPREAD UA ULMUS x MORTON 'ACCOLADE' ACCOLADE ELM 2 1/2" CAL / B&B / 12' HT MIN 50' HEIGHT, 35' SPREAD SHRUBS CSF CORNUTOLONIFERA 'FARROW' ARCTIC FIRE DOGWOOD #2 CONT/ 24" HT MIN W/ 4 CANES 3' HEIGHT, 3' SPREAD RAGL RHUS AROMATICA 'GRO-LOW' GRO-LOW FRAGRANT SUMAC #2 CONT/ 12" HT MIN W/ 3 CANES 2' HEIGHT, 6' SPREAD RR ROSA X 'RADSUNNY' SUNNY KNOCK OUT ROSE #2 CONT/ 12" HT MIN W/ 3 CANES 3' HEIGHT, 3' SPREAD GRAES B SCHIZACHYRIUM SCOPARIUM 'THE BLUES' THE BLUES LITTLE BLUESTEM NO. 1 CONTAINER, 18" SPACING 30" HEIGHT, 18" SPREAD FUTURE 167TH STREET FUTURE 167TH STREET (OR APPROVED EQUAL) SUPER TURF II BY UNITED SEEDS SEEDING RATE: 10 LBS/1000 SF DRILL SEEDED SEED TYPE 'B' STREET TREES AS REQUIRED, REF PLAN NOTES SEED TYPE 'A' (2) GTI EXISTING TREELINE TO REMAIN AHOWN (2) UA QC (1) GTI (6) RAGL CSF (2) AFJ COMMUNITY GARDEN PLOTS QC SEED TYPE 'A' (2) AAB (23) UA FLINT STREET CURRENTLY UNDER CONSTRUCTION) SEED TYPE 'A' QUICK COUPLER HOSE CONNECTION, TYP (6) RAGL (1) GTI (1) AFJ (2) AAB (3) AFJ (1) UA (3) RR (7) RR (20) B (10) RAGL SEED TYPE 'B' 167TH STREET (CURRENTLY UNDER CONSTRUCTION) (3) AAB QC SEED TYPE 'C' (4) UA (2) AFJ (2) GTI EXISTING TREELINE TO REMAIN AHOWN QTY SEED TYPE 'A': SEED TYPE 'B': (OR APPROVED EQUAL) LOW GROW GRA AND WILDFLOWER MIX BY UNITED SEEDS SEEDING RATE: 24 LBS/AC DRILL SEEDED SEED TYPE 'C': (OR APPROVED EQUAL) LOW PROFILE VEGETATED DRAINAGE SWALE MIX BY NATIONAL SEED SEEDING RATE: LBS/AC DRILL SEEDED ROCK TYPE 'A': (OR APPROVED EQUAL) NATIVE COBBLESTONES BY RIVERVIEW STONE 6" DEPTH SEED TYPE 'A' S S Architecture Landscape Architecture Engineering Interiors Fairway, Kansas 2812 W. 53rd Street Fairway, KS Lincoln, Nebraska Kansas City, Missouri Preliminary and Final Development Plans Johnson County Park & Recreation District Verhaeghe Park 167th and Flint Streets Overland Park, Kansas TCEP No.: JCPRD No.: PRK October 25, 2017 Landscape Plan L.1
8 Plot Time Stamp: 10 / 25 / :52:37 AM File Location/Name: \\Tcep-kc-srv-004\ \ JCPRD Verhaeghe Park\3) Active Work\3) AutoCAD\ C1.dwg TRACT C TC BC SPT TC BC SPT SPT AREA WITHIN DASED LINE TO BE PRESERVED/ ESTABLISHED NATURAL AREAS FOR MARC STORM WATER QUALITY REQUIREMENTS SPT SITE GRADING AND STORMWATER PLAN SCALE: 1"=40'-0" FUTURE 167TH STREET FUTURE 167TH STREET TC BC PVMT % SWALE 3, 1.25% TC LP/BC % TC BC PVMT PVMT % ME/PVMT PVMT (CURRENTLY UNDER FLINT STREET CONSTRUCTION) 1.10% 0.50% NATIVE VEGETATED SWALE 1, 1.25% ME/PVMT TC BC TC BC TC BC PVMT PVMT ME/PVMT PVMT PVMT SPT SWALE 2, FFE: DRAIN INLET/ MATCH EXISTING +/ AREA WITHIN DASED LINE TO BE PRESERVED/ ESTABLISHED NATURAL AREAS FOR MARC STORM WATER QUALITY REQUIREMENTS 1.00% % FFE: % 3.00% 167TH STREET (CURRENTLY UNDER CONSTRUCTION) EXISTING PIPE 1 EXISTING 24" RCP D AT 1% DRAIN OUTLET/ MATCH EXISTING +/ (ADD RIPRAP AS REQUIRED PER CITY STANDARD OUTLET PROTECTION DETAIL) S S Architecture Landscape Architecture Engineering Interiors Fairway, Kansas 2812 W. 53rd Street Fairway, KS Lincoln, Nebraska Kansas City, Missouri Preliminary and Final Development Plans Johnson County Park & Recreation District Verhaeghe Park 167th and Flint Streets Overland Park, Kansas TCEP No.: JCPRD No.: PRK October 25, 2017 Site Grading And Stormwater Plan C.1
9 Plot Time Stamp: 10 / 25 / :55:35 PM File Location/Name: \\Tcep-kc-srv-004\ \ JCPRD Verhaeghe Park\3) Active Work\3) AutoCAD\ C2.dwg TRACT C PROPOSED WATERSHED 1 OFF-SITE WATERSHED A PROPOSED WATERSHED OFF-SITE WATERSHED B SITE WATERSHED PLAN SCALE: 1"=40'-0" FUTURE 167TH STREET FUTURE 167TH STREET (CURRENTLY UNDER FLINT STREET CONSTRUCTION) 951 OFF-SITE WATERSHED C PROPOSED WATERSHED 3 167TH STREET (CURRENTLY UNDER CONSTRUCTION) S S Architecture Landscape Architecture Engineering Interiors Fairway, Kansas 2812 W. 53rd Street Fairway, KS Lincoln, Nebraska Kansas City, Missouri Preliminary and Final Development Plans Johnson County Park & Recreation District Verhaeghe Park 167th and Flint Streets Overland Park, Kansas TCEP No.: JCPRD No.: PRK October 25, 2017 Site Watershed Plan C2
10 Plot Time Stamp: 10 / 25 / :56:31 PM File Location/Name: \\Tcep-kc-srv-004\ \ JCPRD Verhaeghe Park\3) Active Work\3) AutoCAD\ C3.dwg NATIVE VEGETATED SWALE 1 SECTION 1 SCALE: NOT TO SCALE 3 6'-0" 6:1 MAX 20'-0" 20:1 MAX SWALE 3 SECTION SCALE: NOT TO SCALE NATIVE VEGETATED SWALE ' MINUMUM CRO SECTIONAL AREA MAXIMUM ALLOWED CAPACITY = CFS FULL VELOCITY = 1.14 FPS SWALE TO BE LINED WITH NATIVE GRAES, SEE PLANTING PLAN FOR NATIVE GRA AREAS 8'-0" WATER QUALITY VOLUME DEPTH 4.00" SWALE 3 30' MINUMUM CRO SECTIONAL AREA MAXIMUM ALLOWED CAPACITY = CFS FULL VELOCITY = 1.27 FPS 14'-0" 20:1 MAX 20'-0" 6'-0" 6:1 MAX 2 6'-0" 6:1 MAX SWALE 2 SECTION SCALE: NOT TO SCALE SWALE 2 30' MINUMUM CRO SECTIONAL AREA MAXIMUM ALLOWED CAPACITY = CFS FULL VELOCITY = 1.27 FPS 14'-0" 6'-0" 6:1 MAX Architecture Landscape Architecture Engineering Interiors Fairway, Kansas 2812 W. 53rd Street Fairway, KS Lincoln, Nebraska Kansas City, Missouri Preliminary and Final Development Plans Johnson County Park & Recreation District Verhaeghe Park 167th and Flint Streets Overland Park, Kansas TCEP No.: JCPRD No.: PRK October 25, 2017 Site Details C3
11 EXHIBIT C Proposed Watershed Calculations
12 StormCalcs Prepared by The Clark Enersen Partners HydroCAD s/n HydroCAD Software Solutions LLC Type II 24-hr 10-Year Rainfall=5.40" Printed 10/25/2017 Time span= hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment OSWB: Off Site Watershed B Subcatchment PW2: Proposed Watershed 2 Runoff Area=23,000 sf 21.74% Impervious Runoff Depth>3.48" Tc=15.0 min CN=85 Runoff=2.49 cfs af Runoff Area=240,000 sf 13.33% Impervious Runoff Depth>2.55" Tc=15.0 min UI Adjusted CN=75 Runoff=19.65 cfs af Total Runoff Area = ac Runoff Volume = af Average Runoff Depth = 2.63" 85.93% Pervious = ac 14.07% Impervious = ac
13 StormCalcs Type II 24-hr 10-Year Rainfall=5.40" Prepared by The Clark Enersen Partners Printed 10/19/2017 HydroCAD s/n HydroCAD Software Solutions LLC Time span= hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Reach EP1: Existing Pipe 1 Avg. Flow Depth=1.39' Max Vel=9.48 fps Inflow=22.14 cfs af 24.0" Round Pipe n=0.011 L=25.0' S= '/' Capacity=26.74 cfs Outflow=22.10 cfs af
14 EXHIBIT D MARC Water Quality Calculations
15 MARC Water Quality Calculations Per MARC requirements a Total VR of 5.00 is required for the site. A Total VR of 5.00 is provided by Native Vegetated Swale 1 and preservation/ establishment of 1.32 acres of natural area. Proposed Watershed 2 and Off-Site Watershed B Quantity Calculations Return Period: Water Quality Storm 1.40 Q = CIA Q = 0.38 x 1.40 x 6.04 Q = 3.21 cfs Native Vegetated Swale 1 Calculations Native Vegetated Swale 1 has been designed to carry the 3.21 cfs of water quality volume coming from Proposed Watershed 2 and Off-Site Watershed B with a flow depth of 4 and a velocity of 0.63 fps. Q = 0.63 x 5.15 Q = 3.24 cfs V = 1.49/ 0.09 (5.15/23.80) 2/3 x /2 V = 0.63 fps
16 WORKSHEET 1: REQUIRED LEVEL OF SERVICE - UNDEVELOPED SITE Project: By: Date: Location: Checked: Date: 1. Runoff Curve Number A. Predevelopment CN Cover Description Soil HSG CN from Table 1 Area (ac.) Product of CN x Area Area-Weighted CN = total product/total area = B. Postdevelopment CN 1 Totals: CN from Product of Cover Description Soil HSG 1 Table 1 Area (ac.) CN x Area Totals: (Round to integer) Postdevelopment CN is one HSG higher for all cover types except preserved vegetation, absent documentation showing how postdevelopment soil structure will be preserved. Area-Weighted CN = total product/total area = (Round to integer) C. Level of Service (LS) Calculation Change in CN LS Predevelopment CN: to 16 7 Postdevelopment CN: 4 to to 3 5 Difference: to -1 3 LS Required (see scale at right): -8 to to APWA / MARC BMP Manual 4-16 October 2012
17 APWA / MARC BMP Manual 4-18 October 2012
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