HomeMy WebLinkAboutMeridian Town Center - Big Al's Development - Storm Water Management - Engineering Drainage Report'w% ore
TII1. LAND GROUP, INC.
Meridian Town Center
Big AI's Development
Meridian, Idaho
STORM WATER MANAGEMENT— ENGINEERING DRAINAGE REPORT
OWNER
CenterCal Meridian, LLC
7455 SW Bridgeport Rd, Ste. 205
Tigard, OR 97224
Ph: 503.968.8940
ENGINEER
The Land Group, Inc.
Jason Densmer, PE
462 East Shore Drive
Eagle, Idaho 83616
Ph: 208.939.4041
Fax: 208.939.4445
Project No. 111049
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462 E. Snom Drive, Ste. 100, Eagle; Idaho 83616 • P 208.939.4041 P206 939.444-5- www thelandgrqupinc.com
July 18, 2011
SITEDE
The Meridian Town Center project is located at the northeast corner of the Fairview and Eagle
road intersection in Meridian, Idaho. The entire project mately 9 -ac
of rapproximately 90 -acres. The
es.
gig AI's phase of the development encompasses app
proposed Power Center phase
The property is currently undeveloped and bordered on the east by the under -construction north and west by the prop
Kleiner Park (City of Meridian) and to the
ill result in the construction of a parking lot and
of Meridian Town Center. The project w
building.
SITE ASSESSMENT OF SOILS & SEASONAL GROUNDWATER
GeoDesign, Inc. has prepared a geotechnical engineering report for the property, dated
September 6, 2007 (copy attached as Appendix C). According to the study, groundwater was
encountered at a depth of between 18.5 and 20 -ft below the ground surface.
GeneraaleYststemslare des gnedsto penetrate theloverlying sfltla1nd ntrodu egstormwater m
Dram g Y
ates m
discharge to the sand and gravel alluvium. The geotechnical testing of the percolation r
percolationles per The drainage
eerates between
6
an
this
strata indica
which will to 8 -inches perhouro
stemsafltersand medium, um,
expected percolation rate for facility sizing.
design, we have used an 8 -in per hour
PEAK RUN-OFF RATE & SYSTEM SIZING
100 -YEAR EVENT AREAS (SEE DRAINAGE AREA EXHIBIT)
The proposed storm drainage will sheet flow across asphalt and landscape areas to storm drain ed
inlets. Storm water will pass through sand and grease traps prior to discharging to seepage
facilities to allow the storm water to percolate into the existing sub soils. Provisions have been
made to collect roof drains and pipe them into the seepage beds.
The drainage systems have been designed to store the 100-year,1-hour endix Bevent
(1.0 in/hr, time of
concentration = 60 min.). The drainage calculations are shown in App
Site Planning e Lrlut5capu Architecture Cvi! Engine ring - • I20 939'406n1tF 2Q 90y�ggq5. v,.u�w.thetandgr nupinc,carn° Surveying
452 E Share Drive, St, 100, Eagle,
July 18, 2011
Appendix A
Site Drainage Areas
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462 E Shore Drive, Ste. 1001, Eagle, {deha S ii • P 208 930 1041 f 208 433.4445 + www_ thelanclgmupine.mm
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July 18, 2011
Appendix 6
Drainage Calculations
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462 E. Shore Drive, Ste. 100, Eagle, fdaho 23616 s P 208.939.4041 F 208.939.4441 - ww+n Ahelandgruapmc.crri
Big Al's (PN 111049)
Storm Drainage Calculations
Drainage Area Characteristics: Overall
Total Volume
Volume of
Volume ofID
Size
Provided
Drain Rock
SandArea1
152,062s.f.
1
10,812 c.f.
22,806 c.f.
2,534 c.f.Area
2 47,472 s.f.
tRunoff
3,379 c.f.
7,128 c.f.
792 c.f.Area3
207,776s.f.
1
15,676 c.f.
33,066 cA.
3,674 c.f.Area
4 3,590 s.f.
267 c.f.
500 c.f.
63,500 c.f.
56 c.f.
7,056 0.
Totals:
29,971 C.T.
30,133 c.f.
7/18/2011
Site Planning ShorenDr Drive, Suite h100t Eagle,'Idaho 83616 - P 08f 39 4041. Irrigation 208.939 4445 efwww the anGraphic
dgroup no coSurveying
Big Al's (PN 111049)
Storm Drainage Calculations
Drainage Area Characteristics: Area 1
Total A= 152,062 s.f.
Pervious= s.f, `- - 0 10
Impervious= 152,062s.f. rj_R.S
Weighted C = 0.85
Tc = 10 min.
Rational Method/Triangular Hydrograph
125 = 2.25 in/hr Q25 = 6 68 cis
1100 = 3.10 in/hr Q100 = 9.20 cfs
V25 = 5,348 c.f.
V100 = 7,368 CA.
7/18/2011
Thompsons Rule (1" per hour)
= 1.0 in/hr 000 Y1 Return Period, tura on 50 nein j
Q= 2.97 cis (Q nt 64 min.)
V = 10,771 c.f.
L = 181 ft
Vr = 22,806 c.f.
Vv = 9,122 c.f.
Vk= 1,689 c.f.
- ( 9 10,812 c.f.
Vtotal >_ V100? •
k = 8.0 in/hr
4.4 hrs
System Size
W= 14 ft
vrtumn "i, drain rock provided
void volume provided
percolation volume provi'Ied
rotal siorcge volurbe provided byseepc;ye tied
Time to Empty
nercrllae ut, rnte
an',e in drm;; rt`qutrerd si«rngrr".`otur,^
S&G Trap Check
Vault Size=
1000 gal.
Baffle Spacing=
3.0 ft
Drainage Area 1A =
152,062 s.f.
Max Flow =
2.97 cfs
0.25 fps
D = 9.0 ft
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
Big Al's (PN 111049)
Storm Drainage Calculations
Drainage Area Characteristics: Area 2
Total A= 47,472 s.f.
Pervious= s.t 0.
Impervious = 47,472 s.f.- =-P`
Weighted C= 0.85
Tc = 10 min.
Rational Method/Triangular Hydrograph
125 = 2.25 in/hr Q25 = 2.08 cfs
1100 = 3.10 in/hr Q100 = 2,87 cfs
V25 = 1,669 c.f.
V100= 2,300c.f.
7/18/2011
Thompsons Rule (1" per hour)
= 1.0 in/hr min.}
Q = 0.93 cis i(i at 60 min.)
V = 3,363 c.f.
L= 99 ft
Vr = 7,128 c.f.
Vv = 2,851 c.f.
Vk = 528 c.f.
3,379 CA,
Vtotal > V100? •
k = 8.0 in/hr
4.4 hrs
Vault Size=
1000 gal.
Baffle Spacing=
1.5 It
Drainage Area 1A =
121,530 s.f.
Max Flaw =
2.37 cfs
0.40 fps
System Size
W=8ft D=Mft
volurne of drain toLk provided
void volume provided
percoiorioz, voturne provided
roto) srorug- volume pr";vlded by seepage bed
Time to Empty
pe,rololion ra#e
t Me to drolr; require sir<r ge vr,(urr,=.
S&G Trap Check
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
Big Al's (PN 111049)
Storm Drainage Calculations
Drainage Area Characteristics: Area 3
Total A= 207,776 s.f.
Pervious= s.f.
Impervious = 207,776 s.f. C = 0,90
Weighted C = 0.90
Tc= 10 min.
Rational Method/Triangular Hydrograph
125 = 2.25 in/hr Q25 = 9.66 ds
1100 = 3.10 in/hr Q100 = 13.31 cfs
V25 = 7,737 c.f.
V100 = 10,660 CA.
7/18/2011
Thompsons Rule (1" per hour)
= 1.0 in/hr 1200-y Rc'trrtr r'eriod, Duration - 60 min-�•
Q = 4.29 cfs (a ai 50 mitt.)
V = 15,583 c.f.
L= 167 ft
Vr= 33,0660.
VV = 13,226 c.f.
Vk.= 2,449 c.f.
15,676 c.f.
Vtotal >_ V100? •
k = 8.0 in/hr
4.4 hrs
Vault Size=
1000 gal.
Baffle Spacing=
1.5 ft
Drainage Area 1A=
53,273 s.f.
Max Flow =
1.10 cfs
0.18 fps
System Size
W=22ft D=9.0ft
volume of drain rock provided
void volume provided
percolation volurne provided
totot storage vra'ome provided by seepage bed
Time to Empty
percoiation rate
tiroe io dra=in required srorcge vaium
S&G Trap Check
OKAY
IV
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
Big Al's (PN 111049)
Storm Drainage Calculations
Drainage Area Characteristics: Area 4
Total A= 3,590 s.f.
Pervious= s.f. C= 0.20
Impervious = 3,590 s.f. 0. P5
Weighted C = 0.85
Tc = 10 min.
Rational Method/Triangular Hydrograph
125 = 2.25 in/hr Q25 = 0 1 cts
1100 = 3.10 in/hr Q100 = 0.22 cfs
V25 = 126 c.f.
V100 = 174 c.f.
7/18/2011
Thompsons Rule (1" per hour)
= 1.0 in/hr (100 yrReturrr Period, Durollon = 60 min.)
Q=0.07cfs (03nr60rnin.j
V= 254 c.f.
L= 20 ft
Vr = 500 c.f.
Vv = 200 c.f.
Vk = 67 c.f.
�M 267 c.f.
Vtotal >_ V100? •
System Size
W=5ft D=5.0It
volume andomruck.orow cd
void vrfume provided
petro(ation volunie provided
total storoge uolu,me provided ,'ry se-=;pcj0" br—d
Time to Empty
k=8.0in/hr percolr ori=r;te
2.6 hers orae to dnair, r('gL+ir€o -'tong e> volume
S&G Trap Check
Vault Size =
1000 gal.
Baffle Spacing =
1.5 ft
Drainage Area 1A =
109,965 s.f.
Max Flow =
2.1.5 cfs
0.36 fps Ok.1l"
Site Planning -Landscape Architecture • Civil. Engineering -Golf Course Irrigation & Engineering � Graphic Design •Surveying
462 E. Shore Drive, Suite 100 • Eagle, Idaho 83626 • P 208.939.4041 - F 208.939.4445 • www.thelandgroupinc.com
'I'M F 1.ANI) e A -P, IN4—
Meridian Town Center
Village Center Development
Meridian, Idaho
STORM WATER MANAGEMENT— ENGINEERING DRAINAGE REPORT
OWNER
CenterCal Meridian, LLC
7455 SW Bridgeport Rd, Ste. 205
Tigard, OR 97224
Ph: 503.968.8940
ENGINEER
The Land Group, Inc.
Jason Densmer, PE
462 East Shore Drive
Eagle, Idaho 83616
Ph: 208.939.4041
Fax: 208.939.4445
Project No. 111049
0
May 22, 2012
SITE DESCRIPTION
The Meridian Town Center project is located at the northeast corner of the Fairview and Eagle
road intersection in Meridian, Idaho. The entire project consists of approximately 90 -acres. The
Village Center phase of the development encompasses approximately 65 -acres.
The property is currently undeveloped and bordered on the east by Kleiner Park (City of
Meridian), to the north by the Power Center Phase of Meridian Town Center, to the south by
Fairview Avenue and to the west by Eagle Road. The project will result in the construction of a
lifestyle shopping center with a broad selection of apparel, home goods, entertainment and
restaurant opportunities.
This report analyzes and provides recommended drainage facilities to serve the needs of the
project. Construction documents of the improvements have been prepared and show final
details necessary for construction.
SITE ASSESSMENT OF SOILS & SEASONAL GROUNDWATER
GeoDesign, Inc. has prepared a geotechnical engineering report for the property, dated
September 6, 2007 (copy attached as Appendix Q. According to the study, groundwater was
encountered at a depth of between 18.5 and 20 -ft below the ground surface.
Generally, the soil profile consists of a thin mantle of silt overlying sand and gravel alluvium.
Drainage systems are designed to penetrate the overlying silt and introduce storm water
discharge to the sand and gravel alluvium. The geotechnical testing of the percolation rates in
this strata indicate expected infiltration rates between 16 and 63 -inches per hour. The drainage
systems include a filter sand medium, which will limit percolation to 8 -inches per hour. For
design, we have used an 8 -in per hour expected percolation rate forfacility sizing.
PEAK RUN-OFF RATE & SYSTEM SIZING
100 -YEAR EVENTAREAS (SEE DRAINAGE AREA EXHIBIT)
The proposed storm drainage will sheet flow across asphalt and landscape areas to storm drain
inlets. Storm water will pass through sand and grease traps prior to discharging to seepage bed
facilities to allow the storm water to percolate into the existing sub soils. Provisions have been
made to collect roof drains and pipe them into the seepage beds.
The drainage systems have been designed to store the 100 -year, 1 -hour event (1.0 in/hr, time of
concentration = 60 min.). The drainage calculations are shown in Appendix B.
Appendix A
Site Drainage Areas
If
May 22, 2012
May 22, 2012
Appendix B
Drainage Calculations
Ir
Village Center (PN 111049)
Storm Drainage Calculations
Drainage Area Characteristics: Area 1(Bldg AG -100)
Total A= 9,450 s.f.
Pervious = s.f. _
Impervious = 9,450 s.f.
Weighted C = 1.00
Tc= 10 min.
Rational Method/Triangular Hydrograph
125 = 2.25 in/hr Q25 = 0.49 cfs
1100 = 3.10 in/hr Q100 = 0.67 cfs
V25 = 391 c.f.
V100 = 539 c.f.
Thompsons Rule (1" per hour)
I= 1.0 in/hr
Q = 0.22 cfs
V = 788 c.f.
System Size
L= 21ft W= 9ft
Vr = 1,701 c.f.
Vv = 680 c.f.
Vk = 126 c.f.
ZZ806c.f,
OKAY
Time to Empty
k = 8.0 in/hr
M 4.3 hr>
S&G Trap Check
Vault Size = 01dcastle New 1000 gal.
Number of units= 11
Baffle Area/unit = 17.08 s.f.
Drainage Area 1A = 19,450 s.f.
Max Flow = 0.67 cfs
��rovflumiiii 0.09 fps OKAY
5/22/2012
D = 9.0 ft
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
Village Center (PN 111049)
Storm Drainage Calculations
Drainage Area Characteristics: Area 2
Total A= 80,981 s.f.
Pervious = s.f.
Impervious = 80,981 s.f.
Weighted C = 0.85
Tc = 10 min.
Rational Method/Triangular Hydrograph
125 = 2.25 in/hr Q25 = 3.56 cfs
1100 = 3.10 in/hr Q100 = 4.90 cfs
V25 = 2,848 c.f.
V100 = 3,924 c.f.
Thompsons Rule (1" per hour)
= 1.0 in/hr
Q = 1.58 cfs
V = 5,736 c.f.
L= 90ft
Vr = 12,150 c.f.
Vv = 4,860 c.f.
Vk = 900 0.
5,760 c.f.
Vtotal >_ V100? •
k = 8.0 in/hr
4.4 hrs
System Size
W=15ft
Time to Empty
5/22/2012
D = 9.0 ft
Site Planning - Landscape Architecture - Civil Engineering - Golf Course Irrigation & Engineering - Graphic Design • Surveying
462 E. Shore Drive, Suite 100 - Eagle, Idaho 93616 - P 208.939.4041 - F 208.939.4445 • www.thelandgroupinc.com
S&G Trap Check
Vault Size =
Old_c_astle New 1000 gal.
Number of units=
2
Baffle Area/unit =
_
I,7.08 s.f. r
Drainage Area lA =
80,981 s.f.
Max Flow=
4.90 cfs
0.35 fps OK yY
5/22/2012
D = 9.0 ft
Site Planning - Landscape Architecture - Civil Engineering - Golf Course Irrigation & Engineering - Graphic Design • Surveying
462 E. Shore Drive, Suite 100 - Eagle, Idaho 93616 - P 208.939.4041 - F 208.939.4445 • www.thelandgroupinc.com
Village Center (PN 111049)
Storm Drainage Calculations
Drainage Area Characteristics: Area 3
Total A= 179,312 s.f.
Pervious = s.f.
Impervious = 179,312 s.f.
Weighted C = 0.85
Tc = 10 min.
Rational Method/Triangular Hydrograph
125 = 2.25 in/hr Q25 = 7.87 cfs
1100 = 3.10 in/hr Q100 = 10.85 cfs
V25 = 6,306 0.
V100 = 8,688 c.f.
5/22/2012
Thompsons Rule (1" per hour)
I = 1.0 in/hr
Q=3.50cfs 4Orr30min.)
V = 12,701 c.f.
L = 200 ft
Vr = 27,000 c.f.
Vv = 10,800 c.f.
Vk = 2,000 c.f.
12,800 c.f.
Vtotal ? V100? •
k= 8.0in/hr
4.3 hrs
System Size
W=15ft
void vchime pros;d�J
�ercogSicn s'c,''u':m� crc✓.J�,.;
total stflr:�ge �'ai�ime provit,'=1 by sz= �� y - _
Time to Empty
S&G Trap Check
Vault Size = Oldcastle New 1000 gal.
Number of units = 14 _
Baffle Area/unit = 7.08 s.f.
Drainage Area 1A = 1179,312 s.f.
Max Flow = 10.85 cfs
0.38 fps Cl[i.\l'
D = 9.0 ft
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
Village Center (PN 111049)
Storm Drainage Calculations
Drainage Area Characteristics: Area 4
Total A = 83,445 s.f.
Pervious = s.f.
Impervious = 83,445 s.f.
Weighted C = 0.85
Tc = 10 min.
Rational Method/Triangular Hydrograph
125 = 2.25 in/hr
1100 = 3.10 in/hr
V25 = 2,935 c.f.
V100 = 4,043 c.f.
I= 1.0 in/hr
Q = 1.63 cfs
V = 5,911 c.f.
L=93ft
Vr = 12,555 c.f.
Vv = 5,022 c.f.
Vk = 930 c.f.
5,952 c.f.
OKAY
k = 8.0 in/hr
4.3 hrs
Q25 = 3.66 cfs
Q100 = 5.05 cfs
Thompsons Rule (1" per hour)
LJOyt t�irn
Q of 60 min.)
System Size
W=15ft
5/22/2012
void volurr= u _
oercolotio,a v_;u;-_ o; wid��l
,,`sii,torr vo :; ,a iavirle f b s2epi;ge he
Time to Empty
S&G Trap Check
Vault Size = j0ldcastle New 1000 gal.
Number of units=
'2
Baffle Area/unit =
7.08 s.f.
Drainage Area 1A =
83,445 s.f. J
Max F�loww=
5.05 cfs
�CGfL"ilrl'LLlii
0.36 fps 0[LjI
D= 9.0 ft
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
Village Center (PN 111049)
Storm Drainage Calculations
Drainage Area Characteristics: Area 5
Total A= 148,997 s.f.
Pervious = s.f.
Impervious = 148,997 s.f.
Weighted C = 0.85
Tc = 10 min.
Rational Method/Triangular Hydrograph
125 = 2.25 in/hr Q25 = 6.54 cfs
1100 = 3.10 in/hr Q100 = 9.01 cfs
V25 = 5,240 c.f.
V100= 7,219 c.f.
Thompsons Rule (1" per hour)
1 = 1.0 in/hr
Q = 2.91 cfs
V = 10,554 c.f.
System Size
5/22/2012
L= 191ft
W= 13ft
Vr= 22,347 c.f.
voiu, , -
Vv = 8,939 c.f.
void vo;ume Orwida
Vk = 1,655 c.f.
perccla:'oa ";fume j'
10,594 c.f.
total ul,ime oro,,
Time to Empty
k = 8.0 in/hr-
f 4.4 hrs
S&G Trap Check
Vault Size = Oldcastle New 1000 gal.
Number of units= 3 -
Baffle Area/unit = I7.08 s.f.
Drainage Area 1A = 1148,997 s.f.
Max Flow= 9.01 cfs
0.42 fps 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
Village Center (PN 111049)
Storm Drainage Calculations
Drainage Area Characteristics: Area 6
Total A= 267,835 s.f.
Pervious = s.f.
Impervious = 267,835 s.f.
Weighted C = 0.85
Tc = 10 min.
Rational Method/Triangular Hydrograph
125 = 2.25 in/hr Q25 = 11.76 cfs
1100 = 3.10 in/hr Q100 = 16.20 cfs
V25 = 9,419 c.f.
V100 = 12,978 c.f.
Thompsons Rule (1" per hour)
I= 1.0 in/hr
Q = 5.23 cfs
V = 18,972 c.f.
L= 343 ft
Vr= 40,131 c.f.
Vv = 16,052 c.f.
Vk = 2,973 c.f.
19,025 U.
OKAY
k = 8.0 in/hr
4.4 hrs
5/22/2012
Time to Empty
D = 9.0 ft
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
S&G Trap Check
Vault Size =
Oldcastle New 1000 gal.
Number of units=
5
Baffle Area/unit =
',7.08 s.f.
Drainage Area 1A =
,267,835 s.f.
Max Flow =
16.20 cfs
0.46 fps OKAY
D = 9.0 ft
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
Village Center (PN 111049)
Storm Drainage Calculations
Drainage Area Characteristics: Area 7
Total A= 64,511 s.f.
Pervious = s.f.
Impervious = 64,511 s.f.
Weighted C = 0.85
Tc = 10 min.
Rational Method/Triangular Hydrograph
125 = 2.25 in/hr Q25 = 2.83 cfs
1100 = 3.10 in/hr Q100 = 3.90 cfs
V25 = 2,269 c.f.
V100= 3,126 c.f.
I = 1.0 in/hr
Q = 1.26 cfs
V = 4,570 c.f.
L= 135ft
Vr = 9,720 c.f.
Vv = 3,888 c.f.
Vk = 720 c.f.
4,608 c.f.
Vtota 12 V 100?
k = 8.0 in/hr
4.3 hrs
Thompsons Rule (1" per hour)
System Size
W=8ft
,_id volume provided
volume provi.':'
5/22/2012
, age vociume pry,, _ -
Time to Empty
S&G Trap Check
Vault Size = IOldcastle New 1000 gal.
Number of units= 12
Baffle Area/unit = 17.08 s.f.
Drainage Area 1A = 164,511 s.f.
Max Flow = 3.90 cfs
0.28 fps OKAY
D = 9.0 ft
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
Village Center (PN 111049)
Storm Drainage Calculations
Drainage Area Characteristics: Area 8
Total A = 44,450 s.f.
Pervious = s.f.
Impervious = 44,450 s.f.
Weighted C = 0.85
Tc = 10 min.
Rational Method/Triangular Hydrograph
125 = 2.25 in/hr Q25 = 1.95 cfs
1100 = 3.10 in/hr Q100 = 2.69 cfs
V25 = 1,563 c.f.
V100 = 2,154 c.f.
Thompsons Rule (1" per hour)
1 = 1.0 in/hr
Q = 0.87 cfs
V = 3,149 c.f.
System Size
L= 74ft W = loft
Vr = 6,660 c.f.
Vv = 2,664 0.
Vk = 493 0.
3,157 c.f.
OKAY
Time to Empty
k = 8.0 in/hr
4.4 hrs
S&G Trap Check
Vault Size =
'Oldcastle New 1000 gal.
Number of units=
2
Baffle Area/unit =
7.08 s.f.
Drainage Area lA ='44,450
s.f.
Max Flow =
2.69 cf;
�- i
0.19 fps OKAY
5/22/2012
D = 9.0 ft
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
Village Center (PN 111049)
Storm Drainage Calculations
Drainage Area Characteristics: Area 9
Total A= 299,250 s.f.
Pervious = s.f.
Impervious= 299,250 s.f.
Weighted C = 0.85
Tc = 10 min.
Rational Method/Triangular Hydrograph
125 = 2.25 in/hr Q25 = 13.14 cfs
1100 = 3.10 in/hr Q100 = 18.10 cfs
V25 = 10,524 c.f.
V100 = 14,500 c.f.
5/22/2012
Thompsons Rule (1" per hour)
= 1.0 in/hr 10p -,r C" Duro _., _ :. nin
Q=5.84 cfs (Q 7t 50 M. in.)
V = 21,197 c.f.
System Size
L= 178ft W= 28ft D= 9.0 ft
Vr = 44,856 c.f.'! -I .: ; " , - '-1, _ ,
Vv = 17,942 c.f. void volume ,orwrded
Vk = 3,323 c.f. perCjkJ""On volume provided
21,265 c.f. otcil storage volume pro'•,ided by ��=,o�u�e bed
OKAY
Time to Empty
k = 8.0 in/hr
4.4 hrs
S&G Trap Check
Vault Size = Oldcastle New 1000 gal_ (2-1500 gal.)
Number of units= 15
Baffle Area/unit = 7.08_s.f.
Drainage Area 1A= ',299,250 s.f.
Max Flow= 18.10 cfs
0.46 fps OKAT
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
Village Center (PN 111049)
Storm Drainage Calculations
Drainage Area Characteristics: Area 10
Total A= 326,703 s.f.
Pervious = s.f.
Impervious = 326,703 s.f.
Weighted C = 0.85
Tc= 10 min.
Rational Method/Triangular Hydrograph
125 = 2.25 in/hr Q25 = 14.34 cfs
1100 = 3.10 in/hr Q100 = 19.76 cfs
V25 = 11,489 c.f.
V100 = 15,830 c.f.
Thompsons Rule (1" per hour)
I= 1.0 in/hr j100 -Yr run
Q = 6.38 cfs rQ or 60 min.)
V = 23,141 c.f.
System Size
5/22/2012
L= 320ft W= 17ft D= 9.0 ft
Vr = 48,960 c.f. il� _ : J, oc;< provij-d
Vv = 19,584 c.f. void volume provided
Vk = 3,627 c.f. percolation volume provided
23,211 c.f. totoi,torage volume orovAded by s22voga fled
0 MT9
Time to Empty
k = 8.0 in/hr
IM4.4 hrs
S&G Trap Check
Vault Size = IOldcastle New 10_00 gal._
Number of units = 6 _
Baffle Area/unit = 7.080.
Drainage Area 1A = 326,703 s.f.
Max Flow = 19.76 cfs
0.47 fps OK a1"
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
Village Center (PN 111049)
Storm Drainage Calculations
Drainage Area Characteristics: Area 11 (Bldg AD -100)
Total A= 7,991 s.f.
Pervious = s.f.
Impervious = 7,991 s.f.
Weighted C = 0.85
Tc = 10 min.
Rational Method/Triangular Hydrograph
125 = 2.25 in/hr Q25 = 0.35 cfs
1100 = 3.10 in/hr Q100 = 0.48 cfs
V25 = 281 c.f.
V100 = 387 c.f.
Thompsons Rule (1" per hour)
1 = 1.O in/hr
Q = 0.16 cfs
V = 566 c.f.
System Size
L=19ft W=7ft
Vr = 1,197 c.f.
Vv = 479 c.f.
�
Vk = 89 c.f.
'ZZ 567 c.f.
Vtotal >_ V100? •
Time to Empty
k = 8.O in/hr
4.4 In rS
S&G Trap Check
Vault Size = Oldcastle New 1000 gal.
Number of units= 1
Baffle Area/unit = 1117.08 s.f.
Drainage Area 1A = 17,991 s.f.
Max Flow= 0.48 cfs
LVA 0.07 fps OKAY
5/22/2012
D = 9.0 ft
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
Village Center (PN 111049)
Storm Drainage Calculations
Drainage Area Characteristics: Area 12 (Bldg AB -100)
Total A= 10,225 s.f.
Pervious = s.f.
Impervious = 10,225 s.f.
Weighted C = 0.85
Tc = 10 min.
Rational Method/Triangular Hydrograph
125 = 2.25 in/hr Q25 = 0.45 cfs
1100 = 3.10 in/hr Q100 = 0.62 cfs
V25 = 360 0.
V100 = 495 0.
I= 1.0 in/hr
Q = 0.20 cfs
V = 724 0.
L= 25ft
Vr= 1,575 0.
Vv = 630 c.f.
Vk = 117 0.
M 747 U.
Vtotal >_ V100? •
Thompsons Rule (1" per hour)
System Size
W=7ft
Time to Empty
k = 8.0 in/hr
4.2 hrs
S&G Trap Check
Vault Size =
'Oldcastle New 1_000_ gal.
Number of units=
1
Baffle Area/unit =
'7.08s f.
Drainage Area 1A =
10,225 s.f.
Max Flow=
0.62 cfs
®'
0.09 fps Oh 1
5/22/2012
ON •11
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
Village Center (PN 111049)
Storm Drainage Calculations
Drainage Area Characteristics: Area 13
Total A= 128,100 s.f.
Pervious = s.f.
Impervious= 128,100 s.f.
Weighted C = 0.85
Tc = 10 min.
Rational Method/Triangular Hydrograph
125 = 2.25 in/hr Q25 = 5.62 cfs
1100 = 3.10 in/hr Q100 = 7.75 cfs
V25 = 4,505 c.f.
V100 = 6,207 c.f.
Thompsons Rule (1" per hour)
1 = 1.0 in/hr
Q = 2.50 cfs
V = 9,074 c.f.
System Size
L= 89 ft W= 24 ft
Vr = 19,224 c.f.
Vv = 7,690 c.f.
Vk = 1,424 0.
9,114 c.f.
7*54-lffli
Time to Empty
k = 8.0 in/hr
4.4 hrs
S&G Trap Check
Vault
Oldcastle New 1000 gal. -
Number of units -'3
Baffle Area/unit =
7.08 s.f.
Drainage Area 1A =
128,100 s.f.
Max Flow =
7.75 cfs
0.36 fps OKAY
5/22/2012
lilliff,",
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
May 22, 2012
Appendix C
Geotechnical Report for Reference
cz
O
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N
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cz
W
Area
9,450
Fairview Avenue 7,991 sf 10,225 sf
Onsite Storm Drainage Tributary Areas
4.t N0.:
App A
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O
co
C
O
C:
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05 i
_CC
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G
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E
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(D
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^C
W
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O
0
E T
O
O
U
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's
TILE LAND GROUP
Pmoct No.:
11101!
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App A