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Home My WebLink AboutSettlers Villlage Square - Phase 2 - Tennis Courts - Storm Water Management - Engineering Drainage Report\t7vti`a- - -AV'f- � dvfvc- X25 lNel.( �ov Vutc( UMoY-e- P1 Settlers Village Square Phase 2: Tennis Courts 3; 5 N. iV eridia r Road, 4 eridian; Idaho Storm Water Management — Engineering Drainage Report Owner I RECE(IV(fED City of Meridian MAY 2 0 2013 Mike Barton 33 E. Broadway Ave. Meridian, Idaho 83642 i3 Ph: 208.888.3579 Engineer StiQNAL GIL �GiST The Land Group, Inc. Jason Densmer, PE p 10961 462 East Shore Drive Eagle, Idaho 83616 rA4-26-130 Ph: 208.939.4041 d ATE of SOA 9`SON DET April 26, 2013 Project No. 112151 Site Planning - Landscape Architecture - Civil Engineering - Golf Course irrigation & Engineering • Graphic Design - Surveying 462 E. Shore Drive, Suite 100 • Eagle, Idaho 83616 • P 208.939.4041 - F 208.939.4445 • www.thelandgroupinc.com T z s: S; •"I'HE LAND GROUP, INC. Site Description Settlers Village Square Phase 2: Tennis courts Storm Water Management Report The project proposes to construct a parking area, five (5) new tennis courts (4 performance courts and 1 stadium court) and three (3) 10 and under courts at the existing park. Thirty five additional parking stalls will be constructed with a right-in/right-out access from W. Ustick Road. The tennis and parking lot project lies within the existing 56 acre Settlers Park. The project limits are approximately 2.85 acres. Peak Run -Off Rate & System Sizing Site Drainage Areas The drainage from the parking lot area of the project will sheet flow across the asphalt surface to the curb and gutter and to catch basins. The flow will discharge through sand and grease traps and into a sub -surface seepage bed. The drainage from the tennis courts will sheet flow to the surrounding lawn area swales that will collect the runoff and direct it to area drains. These area drains will be connected together with perforated pipe that will allow the runoff to infiltrate into the natural sub -soils. The following calculations show that the proposed facilities are adequately sized to accommodate the expected storm water runoff from the site. The site is divided into tributary areas, each with its own drainage system. An overview of the site is given in Appendix A. Developed Storm Volume The drainage systems have been designed to store the 100 -year, 1 -hour event. The drainage calculations are shown in Appendix B. Site Planning • Landscape Architecture Civil Engineering Golf Course Irrigation & Engineering - Graphic Design • Surveying 462 E. Shore Drive, Suite 100 - Eagle, Idaho 83616 • P 208.939.4041 • F 208.939.4445 - www,thelandgroupinc.com r THE LAND GROUP, INC. Appendix Site Drainage Areas Settlers Village Square Phase 2: Tennis courts Storm Water Management Report Site Planning - Landscape Architecture Civil Engineering • Golf Course Irrigation & Engineering Graphic Design • Surveying 462 E. Shore Drive, Suite 100 Eagle, Idaho 83616 • P 208.939.4041 F 208.939.4445 • www.thelandgroupinc.com •THE LAND GROUP, INC. Appendix B Drainage Calculations Settlers Village Square Phase 2: Tennis courts Storm Water Management Report f Site Planning - Landscape Architecture Civil Engineering Golf Course Irrigation & Engineering Graphic Design • Surveying 462 E. Shore Drive, Suite 100 Eagle, Idaho 83616 - P 208.939.4041 • F 208.939.4445 • www.thelandgroupinc.com Settler's Village Square Phase 2 4/26/2013 Storm Drainage Calculations Drainage Area Characteristics: Area 1 Total A= 19,315 s.f. Pervious = 4,920 s.f. Impervious = Weighted C = Tc = 10 min. Rational Method/Triangular Hydrograph 125 = 2.25 in/hr Q25 = 1100 = 3.11 in/hr Q100 = Site Planning - Landscape Architecture Civil Engineering Golf Course Irrigation & Engineering Graphic Design - Surveying 462 E. Shore Drive, Suite 100 - Eagle, Idaho 83616 - P 208.939.4041 F 208.939.4445 - www.thelandgroupinc.corn Settler's Village Square Phase 2 4/26/2013 Storm Drainage Calculations Drainage Area Characteristics: Area 2 Total A= 9,020 s.f. Pervious = 2,827 s.f. Impervious Weighted C = Tc= 10 min. Rational Method/Triangular Hydrograph 125 = 2.25 in/hr Q25 = 1100 = 3.11 in/hr Q100 = Site Planning - Landscape Architecture - Civil Engineering - Golf Course Irrigation & Engineering Graphic Design - Surveying 462 E. Shore Drive, Suite 100 - Eagle, Idaho 83616 - P 208.939.4041 - r 208.939.4445 - www.thelandgroupinc.com Settler's Village Square Phase 2 4/26/2013 Storm Drainage Calculations Drainage Area Characteristics: Area 3 Total A= 32,605 s.f. Pervious= 1,337 s.f. Impervious Weighted C = Tc = 10 min. Rational Method/Triangular Hydrograph 125 = 2.25 in/hr Q25 1100 = 3.11 in/hr Q100 = Site Planning - Landscape Architecture Civil Engineering - Golf Course Irrigation 9, Engineering - Graphic Design Surveying 462 E. Shore Drive, Suite 100 Eagle, Idaho 83616 P 208.939.4041 F 208.939.4445 www.thelandgroupinc.com Settler's Village Square Phase Z 4/26/2013 Storm Drainage Calculations Drainage Area Characteristics: Area 4 Total A= 2,361 s.f. Pervious= 2,180 s.f. Impervious = Weighted C= Tc = 10 min. Rational Method/Triangular Hydrograph 125 = 2.25 in/hr Q25 = 1100 = 3.11 in/hr Q100 = Site Planning - Landscape Architecture - Civil Engineering Golf Course Irrigation & Engineering - Graphic Design - Surveying 462 E. Shore Drive, Suite 100 - Eagle, Idaho 83616 P 208.939.4041 E 208.939.4445 - www.thelandgroupinc.com Settler's Village Square Phase 2 4/26/2013 Storm Drainage Calculations Drainage Area Characteristics: Area 5 Total A= 39,450 s.f. Pervious= 10,112 s.f. - Impervious - Weighted C = Tc = 10 min. Rational Method/Triangular Hydrograph 125 = 2.25 in/hr Q25 = 1100 = 3.11 in/hr Q100 = Site Planning - Landscape Architecture Civil Engineering Golf Course Irrigation & Engineering - Graphic Design Surveying 462 E. Shore Drive, Suite 100 - Eagle, Idaho 83616 - P 208.939.4041 - E 208.939.4445 - www.thelandgroupinc,com Settler's Village Square Phase 2 4/26/2013 Storm Drainage Calculations Drainage Area Characteristics: Area 6 Total A = 8,315 s.f. Pervious = 7,415 s.f. Impervious = Weighted C = Tc= 10 min. Rational Method/Triangular Hydrograph 125 = 2.25 in/hr Q25 1100 = 3.11 in/hr Q100 = Site Planning - Landscape Architecture Civil Engineering - Golf Course Irrigation & Engineering Graphic Design Surveying 462 E. Shore Drive, Suite 100 Eagle, Idaho 83616 P208.939.4041 -F208.939.4445 www.thelandgroupinc.com Settler's Village Square Phase 2 Storm Drainage Calculations Drainage Area Characteristics: Area 7 Total A = 9,766 s.f. Pervious = 9,278 s.f. Impervious = ` -_ Weighted C = Tc = 10 min. Rational Method/Triangular Hydrograph 125 = 2.25 in/hr Q25 = 1100 = 3.11 in/hr Q100 = 4/26/2013 Site Planning - Landscape Architecture - Civil Engineering - Golf Course Irrigation & Engineering Graphic Design Surveying 462 E. Shore Drive, Suite 100 - Eagle, Idaho 83616 - P 208.939.4041 - F 208.939.4445 - www.thelandgroupinc.com Settler's Village Square Phase 2 4/26/2013 Storm Drainage Calculations S&G #1 Characteristics: Areas 1 & 3 Total A= 51,920 s.f. Pervious = 6,257 s.f. Impervious = Weighted C = Tc = 10 min. Rational Method/Triangular Hydrograph 125 = 2.25 in/hr Q25 1100 = 3.11 in/hr Q100 = S&G Trap Check Vault Size = Oldcastle New 1500 gal. w/20" baffle spacing Number of units = 1 Baffle Area/unit = 8.31 s.f. Drainage Area 1A = 51,920 s.f. Max Flow — -- OKAY Site Planning � Landscape Architecture Civil Engineering - Golf Course Irrigation & Engineering Graphic Design - Surveying 462 E. Shore Drive, Suite 100 - Eagle, Idaho 83616 - P 208.939.4041 - F 208.939.4445 - www.thelandgroupinc.com Settler's Village Square Phase 2 4/26/2013 Storm Drainage Calculations S&G #2 Characteristics: Area 2 Total A= 9,020 s.f. Pervious = 2,827 s.f. Impervious Weighted C = Tc = 10 min. Rational Method/Triangular Hydrograph 125 = 2.25 in/hr Q25 1100 = 3.11 in/hr Q100 = - S&G Trap Check Vault Size = 'Oldcastle New 1000 gal. w/12" baffle spacing Number of units = '1 Baffle Area/unit - 4.00 s.f. Drainage Area 1A = ;9,020 s.f. Max Flow OKAY Site Planning - Landscape Architecture - Civil Engineering � Golf Course Irrigation & Engineering Graphic Design Surveying 462 E Shore Drive, Suite 100 , Eagle, Idaho 83616 - P 208.939.4041 F 208.939.4445 www.thelandgroupinc.com Settler's Village Square Phase 2 Storm Drainage Calculations Drainage Area Characteristics: Seepage Bed #1 Total A = 60,940 s.f. Pervious = 9,084 s.f. Impervious = Weighted C = Tc = 10 min. Rational Method/Triangular Hydrograph 125 = 2.25 in/hr Q25 = 1100 = 3.11 in/hr Q100 = V25 = V100 = -_ 1 = 1.1 in/hr Q— V OKAY Thompsons Rule (1" per hour) 4/26/2013 Time to Empty k=8.0in/hr Site Planning - Landscape Architecture - Civil Engineering Golf Course Irrigation & Engineering Graphic Design Surveying 462 E. Shore Drive, Suite 100 - Eagle, Idaho 83616 P 208.939.4041 - F 208.939.4445 www.thelandgroupinc.com Settler's Village Square Phase 2 4/26/2013 Storm Drainage Calculations Drainage Area Characteristics: Seepage Trench #2 Total A= 2,361 s.f. Pervious = 2,180 s.f. Impervious = Weighted C = Tc = 10 min. Rational Method/Triangular Hydrograph 125 = 2.25 in/hr Q25 = - 1100 = 3.11 in/hr Q100 = V25 = V100 = Thompsons Rule (1" per hour) OKAY Time to Empty k= 8.0 in/hr Site Planning - Landscape Architecture Civil Engineering - Golf Course Irrigation & Engineering - Graphic Design Surveying 462 E Shore Drive, Suite 100 Eagle, Idaho 83616 - P 208.939.4041 - F 208.939.4445 - www.thelandgroupinc.com Settler's Village Square Phase Z Storm Drainage Calculations Drainage Area Characteristics: Seepage Trench #3 Total A= 39,450 s.f. Pervious= 10,112 s.f. Impervious Weighted C = Tc = 10 min. Rational Method/Triangular Hydrograph 125 = 2.25 in/hr Q25 = 1100 = 3.11 in/hr Q100 = V25 = V100 = Thompsons Rule (1" per hour) I = 1.0 in/hr Q= V 4/26/2013 OKAY Time to Empty k = 8.0 in/hr Site Planning - Landscape Architecture Civil Engineering Golf Course Irrigation & Engineering Graphic Design Surveying 462 E. Shore Drive, Suite 100 , Eagle, Idaho 83616 - P 208.939.4041 F 208.939.4445 . www.thelandgroupinc.com Settler's Village Square Phase 2 Storm Drainage Calculations 4/26/2013 Drainage Area Characteristics: Seepage Trench #4 & Trench #5 Total A = 8,315 s.f. Pervious = 7,415 s.f. Impervious = Weighted C = Tc = 10 min. Rational Method/Triangular Hydrograph 125 = 2.25 in/hr Q25 = 1100 = 3.11 in/hr Q100 = V25 = '_ - V100 = = 1.0 in/hr Q V= c �� g OKAY Thompsons Rule (1" per hour) Time to Empty k= 8.0 in/hr Site Planning - Landscape Architecture Civil Engineering - Golf Course Irrigation & Engineering Graphic Design Surveying 462 E. Shore Drive, Suite 100 - Eagle, Idaho 83616 P 208.939.4041 F 208.939.4445 - www.thelandgroupinc.com Settler's Village Square Phase 2 Storm Drainage Calculations Drainage Area Characteristics: Seepage Trench #6 Total A = 9,766 s.f. Pervious = 9,278 s.f. _ Impervious Weighted C = Tc = 10 min. Rational Method/Triangular Hydrograph 125 = 2.25 in/hr Q25 1100 = 3.11 in/hr Q100 = V25 = V100 = 1 = 1.0 in/hr Q V=+ L = 90 ft Vr = _ Vv Vk= " OKAY Thompsons Rule (V per hour) 4/26/2013 Time to Empty k = 8.0 in/hr Site Planning - Landscape Architecture - Civil Engineering Golf Course Irrigation & Engineering - Graphic Design Surveying 462 E. Shore Drive, Suite 100 - Eagle, Idaho 83616 - P 208.939.4041 - F 208.939.4445 - www.thelandgroupinc.com