PAGE | 1 STORM WATER DRAINAGE REPORT for Dale Shine Xpress Car Wash Located at 2301 U.S. Highway 83 Business City of McAllen, Hidalgo County, Texas Issue Date: April 10, 2020 Prepared by: Burkhardt Engineering 28 N. Cherry Street Germantown, Ohio 45327 (937) 388-0060 By:____________________________________________ Ryan J. Morrissey, P.E. Date 4/10/2020
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*See Appendix – Exhibits for applicable tables, diagrams, etc.
4/10/2020
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APPENDIX - EXHIBITS
Vicinity Map
USGS Topo Map
FEMA Floodplain Map
USDA Soils Map
Existing Site Map
Proposed Site Map
Detention Basin Grading
Outlet Structure Detail
STORM WATER REPORT EXHIBIT FOR
TBPE Firm No.: 16636
28 North Cherry Street | Germantown, Ohio 45327 | Phone: 937-388-0060 | BURKHARDTINC.COM
CIVIL ENGINEERING | LAND SURVEYING | NATIONAL RETAIL SITE DEVELOPMENT
VICINITY MAP
2301 U.S. HIGHWAY 83 BUSINESS
CITY OF MCALLEN, HIDALGO COUNTY, TEXAS
CAR WASHXPRESS
N
N
23rd S
t.
N
B
icentennial B
lvd.
S
29th S
t.
S
23rd S
t.
SITE
83
BUSINESS
2
83
83
BUSINESS
TBPE Firm No.: 16636
28 North Cherry Street | Germantown, Ohio 45327 | Phone: 937-388-0060 | BURKHARDTINC.COM
CIVIL ENGINEERING | LAND SURVEYING | NATIONAL RETAIL SITE DEVELOPMENT
USGS TOPO MAP
N
U.S. Department of the Interior
U.S. Geological Survey
MISSION / PHARR QUADRANGLE
Texas - Hidalgo County
7.5-minute Series
SITE
CAR WASHXPRESS
2301 U.S. HIGHWAY 83 BUSINESS
CITY OF MCALLEN, HIDALGO COUNTY, TEXAS
STORM WATER REPORT EXHIBIT FOR
TBPE Firm No.: 16636
28 North Cherry Street | Germantown, Ohio 45327 | Phone: 937-388-0060 | BURKHARDTINC.COM
CIVIL ENGINEERING | LAND SURVEYING | NATIONAL RETAIL SITE DEVELOPMENT
FEMA FLOODPLAIN MAP
N
SITE
FIRM # 480343 0005 C, effective date: November 2, 1982
Zone "C" : Areas of minimal flooding.
CAR WASHXPRESS
2301 U.S. HIGHWAY 83 BUSINESS
CITY OF MCALLEN, HIDALGO COUNTY, TEXAS
STORM WATER REPORT EXHIBIT FOR
TBPE Firm No.: 16636
28 North Cherry Street | Germantown, Ohio 45327 | Phone: 937-388-0060 | BURKHARDTINC.COM
CIVIL ENGINEERING | LAND SURVEYING | NATIONAL RETAIL SITE DEVELOPMENT
USDA SOILS MAP
Urban Land:
Hydrologic Soil Group: D
Hidalgo-Urban Land
Complex:
Hydrologic Soil Group: B
Ksat: 0.57 to 1.98 in/hr
N
STORM WATER REPORT EXHIBIT FOR
CAR WASHXPRESS
2301 U.S. HIGHWAY 83 BUSINESS
CITY OF MCALLEN, HIDALGO COUNTY, TEXAS
TBPE Firm No.: 16636
28 North Cherry Street | Germantown, Ohio 45327 | Phone: 937-388-0060 | BURKHARDTINC.COM
CIVIL ENGINEERING | LAND SURVEYING | NATIONAL RETAIL SITE DEVELOPMENT
EXISTING SITE MAP
23
rd
S
tre
et
The existing 0.963 acre site is pre-developed lot and isgenerally flat with two apparent drainage areas, North (0.418acres) and South (0.546). The North drainage area drainstowards South 23rd Street to an existing catch basin and theSouth drainage area drains towards Austin Avenue to anexisting catch basin. The existing 10-year discharge for theNorth Drainage area is 3.28 cfs, being the maximum allowabledischarge in proposed conditions to the North. The existing10-year discharge for the South Drainage area is 2.72 cfs,being the maximum allowable discharge in proposedconditions to the South. The proposed development willmaintain the split drainage areas to the North and South. TheNorth drainage area will decrease impervious area andtherefore will not require storm water detention. The Southdrainage area will increase impervious area and therefore willrequire storm water detention to limit the proposed sitedischarge to existing conditions or better.
North Discharge AreaArea = 0.418 acres (100% pervious)C = 0.90Tc = 10 min
North Discharge Area 10-year Storm Event:Q = 3.28 cfs [0.90 x 8.73 in/hr x 0.418 ac]V = 1,968 cu-ft [3.41 cfs x 10 min x 60 sec/min]
South Discharge AreaArea = 0.546 acres (53% pervious)C = 0.57Tc = 10 min
South Discharge Area 10-year Storm Event:Q = 2.72 cfs [0.57 x 8.73 in/hr x 0.546 ac]V = 1,632 cu-ft [2.72 cfs x 10 min x 60 sec/min]
N
STORM WATER REPORT EXHIBIT FOR
CAR WASHXPRESS
Austin Ave
U.S. Hwy 83
EX. CURB INLET
EX. CURB INLET
EX. BUILDING
EX. CURB INLET
2301 U.S. HIGHWAY 83 BUSINESS
CITY OF MCALLEN, HIDALGO COUNTY, TEXAS
NORTH DISCHARGE AREA
Q-10=3.41cfs
SOUTH DISCHARGE AREA
Q-10=2.71cfs
TBPE Firm No.: 16636
28 North Cherry Street | Germantown, Ohio 45327 | Phone: 937-388-0060 | BURKHARDTINC.COM
CIVIL ENGINEERING | LAND SURVEYING | NATIONAL RETAIL SITE DEVELOPMENT
PROPOSED SITE MAP
The proposed 0.963 acre site will consist of a new Dale ShineCar Wash with onsite storm water collection system for theSouthern Drainage area (0.570 acres) which has been designedto collect the proposed 50-year site discharge of 4.63 cfs anddrain into a detention basin sized to store the required volumefor the 50-year storm event (1,140 cu-ft) and discharge at amaximum rate of less than the existing 10-year storm event(2.69 cfs).
North Discharge AreaArea = 0.393 acres (73% pervious)C = 0.71Tc = 10 min
North Discharge Area 50-year Storm Event:Q = 3.02 cfs [0.75 x 10.83 in/hr x 0.393 ac]V = 1,812 cu-ft [3.02 cfs x 10 min x 60 sec/min]
South Discharge AreaArea = 0.570 acres (78% pervious)C = 0.75Tc = 10 min
South Discharge Area 50-year Storm Event:Q = 4.63 cfs [0.75 x 10.83 in/hr x 0.570 ac]V = 2,778 cu-ft [4.63 cfs x 10 min x 60 sec/min]
PR
OP
OS
ED
C
AR
W
AS
H
Measured Impervious Area (Building, Pavement, Sidewalk, etc.) = 31,760 sq-ft (76% lot coverage)Measured Pervious Area (Lawn, Landscaping, etc) = 10,195 sq-ft (24% lot coverage)
STORM WATER REPORT EXHIBIT FOR
N
CURB CUT
CAR WASHXPRESS
N
23
rd
S
tre
et
Austin Ave
U.S. Hwy 83
CURB CUT
OUTLET
CONTROL
12"@1.00%
2301 U.S. HIGHWAY 83 BUSINESS
CITY OF MCALLEN, HIDALGO COUNTY, TEXAS
EX. CURB INLET
EX. CURB INLET
EX. CURB INLET
NORTH DISCHARGE AREA
Q-50=3.02cfs
BASIN INFLOW
Q-50=4.63cfs
BASIN OUTFLOW
Q-50=2.71cfs
AUSTIN AVENUE
TBPE Firm No.: 16636
28 North Cherry Street | Germantown, Ohio 45327 | Phone: 937-388-0060 | BURKHARDTINC.COM
CIVIL ENGINEERING | LAND SURVEYING | NATIONAL RETAIL SITE DEVELOPMENT
DETENTION BASIN GRADING
STORM WATER REPORT EXHIBIT FOR
CAR WASHXPRESS
2301 U.S. HIGHWAY 83 BUSINESS
CITY OF MCALLEN, HIDALGO COUNTY, TEXAS
WESTERN STORAGE VOLUME:124.00 (invert) Contour Area = 212 sq-ft124.80 (overflow) Contour Area = 238 sq-ftStorage Volume = 180 cu-ft
SOUTHERN STORAGE:124.00 (invert) Contour Area = 762 sq-ft124.80 (overflow) Contour Area = 1,160 sq-ftStorage Volume = 769 cu-ft
EASTERN STORAGE AREA:124.00 (invert) Contour Area = 334 sq-ft124.80 (overflow) Contour Area = 464 sq-ftStorage Volume = 319 cu-ft
TOTAL SYSTEM STORAGE VOLUME = 1,268 cu-ft
TBPE Firm No.: 16636
28 North Cherry Street | Germantown, Ohio 45327 | Phone: 937-388-0060 | BURKHARDTINC.COM
CIVIL ENGINEERING | LAND SURVEYING | NATIONAL RETAIL SITE DEVELOPMENT