HomeMy WebLinkAboutMeridian Town Center - Village Center Development - Storm Water Management - Engineering Drainage Report (4)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
ice*
10961
The Land Group, Inc.
Jason Densmer, PE
qT�c �pP
462 East Shore Drive
J OF
NDI
Eagle, Idaho 83616
Ph: 208.939.4041
Fax: 208.939.4445
9-24-12
Project No. 111049
or
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462 E, Shore Drive, Ste. 100, Eagle, Idaho 83616 • P 208939.4041 F 208.939.4445 • www.thelandgroupinc.coni
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 C). 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 for facility sizing.
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
inlets. Storm water will pass through sand and grease traps priorto 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.
Ir
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462 E. Shore Drive, Ste. 100, Eagle, Idaho 83616 • P 208.939.4041 F 208.939.4445 o www,thelandgroupinc.com
May 22, 2012
Appendix A
Site Drainage Areas
,r
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462 E. Shore Drive, Ste. 100, Eagle, Idaho 83616. P 208.939.4041 F 208.939.4445 • www.thelandgroupinc.com
May 22, 2012
Appendix B
Drainage Calculations
Ar
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462 E. Shore Drive, Ste. 100, Eagle, Idaho 83616 • P 208.939.4041 F 208.939.4445 e www.thelatidgroupinc.com
Village Center (PN 111049)
Storm Drainage Calculations
Drainage Area Characteristics: Area 1 (Bldg AG -100)
Total A = 9,450 s.f.
Pervious =s.f. C= 0.10
Impervious*_= C= 1.00
Weighted C = - n"'
Tc = 10 min.
Rational Method/Triangular Hydrograph
125 = 2.25 in/hr Q25
1100 = 3.10 in/hr, Q100
5/22/2012
V25 = ::ass J.
V100 = S' "'C'- c.E
Thompsons Rule (1" per hour)
I = 1.0 in/hr (100 -yr Return Period, Duration= 60 min.)
Q = 0.22 cfs (Q at 60 min.)
V =- 788 CJ,
System Size
L=21ft
W=9ft D=9.0ft
Vr
volume of drain rock provided
Vv = 680 r.=.
void volume provided
Vk =` 126 c.f.
percolation volume provided
e.f,
total storage volume provided by seepage bed
����I�I���} �y�806
'•IiYi�ii�iliiii OKAY
OK,1Y
Time to Empty
- k= 8.0 in/hr percolation rate
t;�-.t time to drain required storage volume
S&G Trap Check
Vault Size =
jOldcastle New 1000 gal.
Number of units =
1
Baffle Area/unit =
7.08 s.f.
Drainage Area 1A =
9,450 s.f.
Max Flow =;
OK,1Y
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462 E. Shore Drive, Suite 100 - Eagle, Idaho 83616 � P 208.939.4041. • F 208.939.4445 - www.thelandgroupinc.com
Village Center (PN 111049) 5/22/2012
Storm Drainage Calculations
Drainage Area Characteristics: Area 2
Total A= 80,981 s.f.
Pervious= s.f. C= 0.10
Impervious = 80,981 s,f. C= 0.85
Weighted C =',.85
Tc= 10 min.
Rational Method/Triangular Hydrograph
125 = 2.25 in/hr Q25 = 15cls
1100 = 3.10 in/hr Q100 = '�i:1v ens
V 2 5 4 :. .
V100 =7 -J,
Thompsons Rule (1" per hour)
I= 1.0 in/hr (100 -yr Return Period, Duration = 60 min.)
Q 1.68 r - (Q at 60 min.)
V - m,77-" w,$.
System Size
L-90 ft W=15 ft D=9.0ft
V r%,7$.a ;..r', volume of drain rock provided
Vv = 4,860 c.f, void volume provided
Vk = 900 c.f. percolation volume provided
5,760 c.f, total storage volume provided by seepage bed
lavAMIA 0KAY
Time to Empty
_ k = 8.0 in/hr percolation rate
r s time to drain required storage volume
5&G Trap Check
Vault Size -
Oldcastle New 1000 gal.
Number of units -
2
Baffle Area/unit
7.08s.f.
Drainage Area 1A -
80;981 s.f.
Max Flow =
=5 =
OKAY -
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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 3
Total A= 179,312 s.f.
Pervious= s.f. C= 0.10
Impervious= C= 0.85
Weighted C
Tc = 10 min.
Rational Method/Triangular Hydrograph
125 = 2.25 in/hr Q 2 5
1100 = 3.10 in/hr ' Q100
V25r-.6 c,
V100 ^,68 r.>.
I = 1.0 in/hr
Q
V
Rule (1"
5/22/2012
(100 -yr Return Period, Duration = 60 min.)
(Q at 60 min.)
System Size
L = 200 ft W = 15: ft _ D = 9.0 ft
Vr= 27,0310t;.?, volume of drain rock provided
Vv 1,800 eJ, void volume provided
Vk = 120M cv.f percolation volume provided
z1,c.00q c.f. total storage volume provided by seepage bed
Vtotai> Vioo?-•
Time to Empty
8.0 in/hr percolation rate
4.f, h� tune to drain required storage volume
S&G Trap Check
Vault -Size =
10ldcastle New 1000 gal.
Number of units =F4
Baffle Area/unit-
rea/unit-Drainage
_
DrainageArea 1A =
179,312 s.f. W
Max Flow
z -� , >
mow : OKAY
.,:�;
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462 E. Shore Drive, Suite 100 - Eagle, Idaho 83616 • P 208.939.4041 • F208.939.4445-www.thelandgroupinc.com
Village Center (PN 111049) 5/22/2012
Storm Drainage Calculations
Drainage Area Characteristics: Area 4
Total A= 83,445 s.f.
Pervious= s C C= 0.10
Impervious = 83,445 s,f. C= 0.85
Weighted C = _I "."_
Tc = 10 min.
Rational Method/Triangular Hydrograph
125 = 2.25 In/hr Q25 = 3.66 cls
1100 = 3.10 in/hr Q100 = x1'05
V25,3213
V100 = 4,043
Thompsons Rule (1" per hour)
I = 1.0 in/hr (100 -yr Return Period, Duration = 60 min.)
Q = 11631' (Q at 60 min.)
V = 6,:';11 C' f.
System Size
L=93ft- W=15 ft D=9.Oft
Vr = , s volume of drain rock provided
Vv = 'z,U22 c. f, void volume provided
Vk= 930 c.f, percolation volume provided
5,952 c.f. total storage volume provided by seepage bed
1 Vtotal>-V100? •
Time to
k = 8.0 in/hr percolation rate
a 1,3 hV, time to drain required storage volume
S&G Trap Check
Vault Size
joldcastle New 1000 gal.
Number of units=
12
Baffle Area/unit -
17.08 s.f.
Drainage Area 1A =
_
83;445 s.f.
Max Flow =
S,05- efs
NEMIMM
0.36 fps DKNY
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462 E. Shore Drive, Suite 100 - Eagle, Idaho 83616 • P 208.939.4041.- F 208.939.4445 - www.thelandgroupinc.com
Village Center (PN 111049) 5/22/2012
Storm Drainage Calculations
Drainage Area Characteristics: Area 5
Total A= 148,997 s.0
Pervious= s.f. C= 0.10
Impervious r,,:1 s C= 0.85
Weighted C=J�:v'
Tc= 10 min.
Rational Method/Triangular Hydrograph
125- 2.25`in/hr - Q25 = 4.$4f:
1100 = 3.10 in/hr Q100 = 9,011 cz"
V25 = 5, "O c,-".
V100 = 7,219 c.f.
Thompsons Rule (1" per hour)
1 = 1.0 Whir (100 -yr Return Period, Duration = 60 min.)
Q = '1.51 cats (Q at 60 min.)
V - 113,354 c,f,
System Size
L= 191 ft
W=13ft D= 9.0 ft
Vr - 22;34-, c..
volume of drain rock provided
Vv 3,539 e,L
void volume provided
Vk L6TS
percolation volume provided
+ -,10,594 c.f,
total storage volume provided by seepage bed
Vtotal>_'V1002 •
Time to Empty
k = 8.0 in/hr percolation rate
l 4 :_r= time to drain required storage volume
S&G Trap Check
Vault Size= jOldcastle New 1000 gal.
Number of units = 3 -
Baffle Area/unit 7.08 s.f. -
Drainage Area 1A - 1148,997 s.f.
Max Flow !0) ";
. + ilk p it OKAY
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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. C= 0.10
Impervious = C= 0.85
Weighted C
Tc= 10 min.
Rational Method/Triangular Hydrograph
125 = 2.25 in/hr Q25=
1100 = 3.10; in/hr Q100 = =.6.20 efs
5/22/2012
V25 ' £..f.
- V100 =. 12,97e Ca .
Thompsons Rule (1" per hour)
= 1.0 in/hr (200 -yr Return Period, Duration = 60 min.)
Q 5,23'c a (Q at 60 min.)
V ° 3.972 r.,:.
L = 343 ft
Vv = ''6,052 C'C
Vk = 2,921 c.f.
OKAY
System Size
W-13 ft- D=9.0ft
volume of drain rock provided
void volume provided
percolation volume provided
total storage volume provided by seepage bed
Time to Empty
k = 8.0 in/hr percolation rate
- =- _ a:> time to drain required storage volume
S&G Trap Check
Vault Size=
Oldcastle New 1000 gal.
Number of units -
15
Baffle Area/unit =
17.08 s.f.
Drainage Area 1A=
1267,835 s.f. -
Max Flow
_#ctws: '!ii k Im�:.-6'r
f ,'-' OKAY
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462 E. Shore Drive, Suite 100 • Eagle, Idaho 83616 • P 208.939.4041. • F 208.939.4445 - www.thelandgroupinc.com
Village Center (PN 111049) 5/22/2012
Storm Drainage Calculations
Drainage Area Characteristics: Area 7
Tota l A = 64,511 s.f.
Pervious = s.f. C= 0.10
Impervious =C'4,53"s.f. C= 0.85
Weighted C
Tc = 10 min.
Rational Method/Triangular Hydrograph
125 - 2.25_in/hr Q25 = R.&4 �Os
1100 = 3.10in/hr Q100 = 3 -SO is
V25 = ','_cH .:i.
V100 =
Thompsons Rule (1" per hour)
= 1,0 in/hr (100 -yr Return Period, Duration = 60 min.)
Q= 3,26 fs (Qat60minj
V = 4757C c,,1E
System Size
L=135 ft W=8ft D=9.0ft
V - 9,120. volume of drain rock provided
Vv _ 3,888 c,f, void volume provided
Vk - 720 c,f, percolation volume provided
• 4,608 c.f. total storage volume provided by seepage bed
Vtotal? V100?
Time to Empty
k = 8.0 in/hr percolation rate
`''; i. '3'dies time to drain required storage volume
S&G Trap Check
Vault Size -
Oldcastle New 1000 gal.
Number of units -
2
Baffle Area/unit
7.08's.f.
d�
Drainage Area 1A-
64,511s.f.
Max Flow =
330 efs
+
U fps OKAY '.
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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- sJ. C= 0.10
Impervious= 44,450 M. C= 0.85
Weighted C = D -S-5 ,
Tc= 10 min.
Rational Method/Triangular Hydrograph
125 = 2.25 in/hr Q25 = 2,95 cas
1100 = 3.10 in/hr Q100 = 2,69 dhi
V25 = 1,56>
V100 = 2,154 C a.
5/22/2012
Thompsons Rule (1" per hour)
I= 1.0 in/hr (100 -yr Return Period, Duration = 50 min.)
Q = 0,87 65 (Q at 60 min.)
V 31.11'19 r:.%.
L=,74 ft
Vr = 6,6ho C.f.
Vv = �,F64 c -f.
Vk 493 c,f.
r 3,t570f
OKAY
System Size
W= 10ft D=9.Oft'
volume of drain rock provided
void volume provided
percolation volume provided
total storage volume provided by seepage bed
Time to Empty
k= 8.0 in/hr percolation rate
yrs time to drain required storage volume
S&G Trap Check
Vault Size =
10ldcastle New 1000 gal.
Number of units=
2
Baffle Area/unit -
7.08 s.f.
Drainage Area 1A-
144,450s.f.
Max Flow
ery€ rfs
ml�- ®
&, _q fps 01<1AY
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. C= 0.10
Impervious = aC= 0.85
Weighted C
Tc = 10 min.
Rational Method/Triangular Hydrograph
125 = 2.25 in/hr Q25 = .3.14 ck
1100 =3.10 in/hr Q100 = '3u.'z cfs
V25 = 3,524v:J,
5/22/2012
Thompsons Rule (1" per hour)
I = 1.0Sin/hr (100 -yr Return Period, Duration = 60 min.)
Q = �81 C (Q at 60 min.)
V = 21,191 ,.f.
L= 178ft
Vr= 44,4356c.f
Vv 17,942 c.f
Vk 3,323 c.f.
2_ .265 c.f
OKAY
System Size
W=28ft D=9.0ft
volume of drain rock provided
void volume provided
percolation volume provided
total storage volume provided by seepage bed
Time to Empty
k = 8A in/hr percolation rate
4A °Wtime to drain required storage volume
S&G Trap Check
Vault Size= jOldcastle New 1000 gal. , (2-1500 gal.)
Number of units= 5'
Baffle Area/unit =I 7.08 s.f.
Drainage Area 1A = 1299,250 s.f.
Max Plow
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462 E. Shore Drive, Suite 100 - Eagle, Idaho 83616 • P 208.939.4041.- E 208.939.4445 - www.thelandgroupine.com
Village Center (PN 111049)
Storm Drainage Calculations
Drainage Area Characteristics: Area 30
Total A = 326,703 s.f.
Pervious = s.f. C= 0.10
Impervious= S,"e' C= 0.85
Weighted C
Tc= 10 min.
Rational Method/Triangular Hydrograph
5/22/2012
125 = 2.25 in/hr
Q25 =
1100= 3.10 in/hr
Q100 7 1
V25 = 10,99
7.08 s.f.
V100 = t-S'a"'O 0.
1326,703 s,f. -
Max Flow =
Thompsons Rule (1" per hour)
I = 1.0 in/hr
-
(100 -yr Return Period, Duration = 60 min.)
-
Q u, 3 c's
(Qat 60 min.)
V = 23,14. 0,
System Size
L = 320 ft W = 17 ft - D = 9.0 ft F
Vr 4%960 c.;, volume of drain rock provided
Vv 19,584c,C void volume provided
Vk =` 3,627 c,f, percolation volume provided
23„211 0. total storage volume provided by seepage bed
�_ 17t0�i� �� • '
Time to Empty
k = 8.0 in/hr percolation rate
s
a=r� time to drain required storage volume
S&G Trap Check
Vault Size =
jOldcastle New 1000 gal.
Number of units -F6
Baffle Area/unit
7.08 s.f.
Drainage Area 1A =
1326,703 s,f. -
Max Flow =
,. '9,76 .cts
jjjjjjjn• ..: •
0.4”? fn" Oh d.Y
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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. C= 0.10
Impervious = J. C= 0.85
Weighted C=
Tc = 10 min.
Rational Method/Triangular Hydrograph
125 = 2.25 in/hr Q25 = 0.35 crs
1100=3.10 in/hr Q100='0.48cf.,
5/22/2012
V100 87 r:..
Thompsons Rule (1" per hour)
I = 1.0 in/hr (100 -yr Return Period, Duration = 60 min.)
Q = 0.16 efs (Q at 60 min.)
V = 566 c.f.
L 19 ft
Vr= 1,-E97t.'.
Vk= 851 c.f.
567 c.f.
System Size
W-7ft D=9.0ft_
volume of drain rock provided
void volume provided
percolation volume provided
total storage volume provided by seepage bed
Time to Empty
. G}._yn t c --_. ._.,,-•`F -. -. ....... .: _ _...... a .-.ymvklw -. nmTG
I
k = 8.0 in/ percolation rate
hs s time to drain required storage volume
S&G Trap Check
Vault Size - jOldcastle New 1000 gal.
Number of units- 11
Baffle Area/unit - 17.08 s.f.
Drainage Area, 1A= 7,991s.f.
Max Flow= rI. 21 cls
_.aE77 fps OK-kY
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Village Center (PN 111049)
Storm Drainage Calculations
Drainage Area Characteristics; Area 12 (Bldg AB -100)
Total A= 10,225 s.f.
Pervious = s.f. C= 0.10
Impervious C= 0.85
Weighted C
Tc= 10 min.
Rational Method/Triangular Hydrograph
125 = 2.25 in/hr Q25 =r'=
1100 = 3.10 in/hr Q100 = 0167 n
V25
V100
5/22/2012
Thompsons Rule (1" per hour)
I = 1.0 in/hr (100 -yr Return Period, Duration = 60 min.)
Q = 0.20 cfs (Q at 60 rain.)
V = 724 c,C
L= 25 ft
Vr= ib575 cA,
Vv=530CJ,
Vk= 11.7cti.
747 c.f.
Vtotal> V100? •
System Size
W=7ft D=9.0fl
volume of drain rock provided
void volume provided
percolation volume provided
total storage volume provided by seepage bed
Time to Empty
k= 8.0 in/hr percolation rate
time to drain required storage volume
S&G Trap Check
Vault Size= jOldcastle New 1000 gal
Number of units- RE
BaffleArea/unit = 7.08 0.
Drainage Area 1A - 10,225 s.f.
Max Flow =F
0K -NY
• o r 'a':3
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462 E. Shore Drive, Suite 100 - Eagle, Idaho 83616 � P 208.939.4041. • F208.939.4445 • www.thelandgroupinc.com
Village Center (PN 111049) 5/22/2012
Storm Drainage Calculations
Drainage Area Characteristics: Area 13
Total A= 128,100 s.f.
Pervious = s.f. C= 0.10
Impervious = C= Q85
Weighted C = 0.
Tc = 10 min.
Rational Method/Triangular Hydrograph
125 = 2.25 in/hr Q25
1100 = 3.10 in/hr Q100 li-
V100
Thompsons Rule (1" per hour)
I= 1.0 in/hr (100 -yr Return Period, Duration = 60 min.)
Q ISOrfs (Q at 60 min.)
System Size
L = 89 ft W = 24 ft D = 9.0 ft
Vr 9,224 r..f. volume of drain rock provided
Vv = 7? 690 c,f. void volume provided
Vk „424 c.f, percolation volume provided
0,114 r'f. total storage volume provided by seepage bed
I, Vtotal> V100? •
Time to Empty
=mss. .
k - 8.0 in/hr percolation rate
IsA = s time to drain required storage volume
S&G Trap Check
VaultSize -
Oldcastle New 1000 gal.
Number of units -
3
Baffle Area/unit -
7.08 s.f.
Drainage Area 1A
_
1128,100 s.f.
Max Flow
5.15
- o0,
w„=. iii^ OKAY
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462 E. Shore Drive, Suite 100 - Eagle, Idaho 83616 - P 208.939.4041 - F208.939.4445-www.thelandgroupinc.com
May 22, 2012
Appendix C
Geotechnical Report for Reference
AF
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