CC - Storm Drainage Calcs Storm Drainage _Ic _I_ _ i _ _s
LAVENDER HEIGHTS SUBDIVISION NO. 2
Meridian, I
2v4e of 10p
P.
3/09/2021
Civil Innovations, PLLC
1043 E. Park Blvd.Ste. 101
Boise, ID 83712
Phone: (208) 884-8181
www.civil-innovations.com
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Lavender Heights Subd. No. 2
Pipe Sizing Calculations
DI#9A to DI#913
Q(25)= 0.78 CFS
Slope= 0.0085
Diameter= 12 inch
Mannings "n" = 0.012
A= 0.79 sqft
P= 3.14 ft
R= 0.25
Full Flow Capacity= 3.57 CFS OK
DI#913 to SG#9
Q(25)= 2.62 CFS
Slope= 0.0056
Diameter= 12 inch
Mannings "n" = 0.012
A= 0.79 sgft
P= 3.14 ft
R= 0.25
Full Flow Capacity= 2.89 CFS OK
Lavender Heights Subd. No. 2
Sand and Grease Trap
SG# Basins High Flow Bypass Design Storm Design Flow SG Size
C.F.S.
9 9A+9B No 100 3.65 1500
1000 Gallon =3.33 CFS
1500 Gallon =4.15 CFS
Lavender Heights Subd. No. 2
Seepage Bed Calculations
Seepage Bed#9
(in right-of-way)
V(100) DI#9A= 1852.0 CF
V(100) DI#9B= 4673.0 CF
V(100)= 6525.0 CF
V(100)- Infiltration Volume 4945.0
25%Sediment 1236.3 CF
Storage Required 6181.3 CF
Bed Width 15.0 FT
Bed Length 158.0 FT
Bed Depth 6.50 FT
Total Drainrock Footprint 15405 CF
18" Pipe Volume 279.1 CF
Pipe Storage Volume 139.5 CF
Drain Rock Volume 15125.9 CF
Void Ratio 0.40
Drain Rock Storage 6050.4 CF
Storage in Pipe 139.5 CF
Storage in Drainrock 6050.4 CF
Total Storage 6189.9
Time to Drain
Infiltration Rate= 8.0 In/Hr
Infiltration Area= 2370.0 SF
Infiltration Volume= 1580.0 CF/Hr
V(100)= 6525.0 CF
V(100)- Infiltration Volume 4945.0
Time To Drain= 4.13 Hr
UNPLATTED
/
1 j BLACKROCK DRAINAGE AREA SW1 BLACKROCK I v
1/ SUBDIVISION NO.i (TO'PRNAIE SEEPAGE BEDS' SUBDMSION NO.1 m�
PSB1/ THRU PSB13)38,362 S.F./0.88 ACRE
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®®®ammo mmmm mmmm � ®-m�r-m�rrr� sa+•-mom ®a® m�®mom r®a-mom msa r m�mm-mr�® � N
®® mmm mmmm mmm® ® 1r _m-mfY.-m mmmmmm6A mmm mmm mmm mmm mmm mmmm �mm mmm mmm N � o
ALOCK4 to = B 1 ] s s BtacK� {�
i ® DRAINAGE AREA 73A - ® ! NTURE LAVENDER® DRAINAGE AREA SA I ®
DRAINAGE AREA I2A ® ® W I I HEIGHTS SUBDMSION ® DRAINAGE AREA 6A ® DRAINAGE AREA 7A ® IMPR..EASTRIDCE w s
® 78,177 S.F./1.79 ACRE ® 105,008 S.F./2.41 ACRE ® e I 1 117,814 S.F./2.70 ACRE 49,004 S.F./1.12 ACRE 49,749 B.F./1.14 ACRE sus6MSIDN xo.1 -
® 'RE
UVENDER FUTURE LAVENDER I ® EASTING LAVENDER ® EASTING LAVENDER ® DISnNG LAVENDER I 1 m o
1 1 HEIGHT3 SUBDMSION ® HEI6HT6 SUBDMSION ® ® ( HEIGHTS SUBD.NO.i 11 HEIGHTS SUED.N0.1 1 HEIGHTS SUBD.N0.1 ® o d
•
DI EA• + FUTURE E.BRACE ST -� FIRURE 0113A ---1®---+- DI SA EYJSTINGE BRACE R. DI7A a m®
-+ NTURE DI I2A
• ® mmommomm44.m mo®mommommf®mrama®m>iamaa m�®mo®rasmom mrmmm 1
+1 + FUTURE 01128 + + I NTURE DI I3B s + DI SB -s DI 6B �- DI
FUTURE LAVENDER
FUTURE SB 12 ..-._.._.. ..-.. FUTUREISB I3.-.. ..-.. NEIGHT3 SUBOMSION ® t4 / B iB „
ti EXST SBfi- - ' -EXIST 6B]_..
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mm®®mmmm i T /s ® z S�'
DRAINAGE AREA 128 DRAINAGE AREA 138 i } } }®} 1 1 4
36,631 S.F./0.84 ACRE 170'411 S.F./2.53 ACRE I ® ® 1s } } __®e® I m' I DRAINAGE AREA'DFFSITE°
FI1TURE LAVENDER 1I I __®__ Ti 4,173 S.F. 0.10 ACRE
L a FUTURE LAVENDER •
• U HEIGHTS SUBDIVISION HEIGHTS SUBDIVI.N i i DRAINAGE AREA 5B 3 DRAINAGE AREA 6B BLD7 Ka BLgfIK6 R
• iii®_ ® 56,675 S.F./1.30 ACRE■® 133,932 S.F./3.07 ACRE I BLQ�K7
EXISTING LAVENDER gE%ISnNG LAVENDER }3 }
® pS HEIGHTS BOB..N0.1 HEIGHTS SUBD.NO.1 1
ggp j DRAINAGE AREA 7B ®.
DRAINAGE AREA 11A ®` I 11 4 I 6 12 1 52,634 S.F./1.21 ACRE
1 ® = 7fi,725 S.F./1.76 ACRE a= ® 17 Da STING LAVENDER ®® IMPRESSIVE EAST RIDGE
® ` MIURELAVENOER } } �6 DRAINAGE AREA BA 1� S�°NAL EN
NEIGNIS SUBDM310N I ® 1 HEIGHTS SUBD.N0.1 SUBDIAMN NO.
2 DRAINAGE AREA 8B 82,842 S.F./1.90 ACRE
It ', ® -�NTURE DI IIA 111 E.MAINACHT ST
110 y j s 64,663 S.F,/1.48 ACRE y
• y NTURE Dl ®�lmormom:mo�msm-®Ym-® •ll1
a a o ( BLO$K9 1 1 NT����/��•2/p
BtOCK7 4s sz �( 1 d A2, apt p5
FUTURE LAVENDER 19 :.R e 6 4 11 ® ``'Yf9L�pT�a°3•
1111 ® e FUTURE LAVENDER
FUTURE LAVENDER HEIGHTS SUBDIVISION
1+ ® HEIGHTS SUBDMSION I Hfl®®®®® m�
20 - g 7 }I} Bl0gK6
® < DRAINAGE AREA AC }'+ ®®®®® I ®mmmm 15 s6d
• DRAINAGE AREA 11B � 133,493 S.F./3.06 ACRE I
® 92,432 S.F./2.12 ACRE BLo xa a 1 DRAINAGE AREA SVJ2 G o 0
FUTURE' __ .m- ® _ Ek15nNG LAVENDER 3g ® _
® HEIGHTS SUBDMSION j (HEIGHTS SUBD.N0.1 4 ` / I P DRAINAGE AREA 4A 35,435 S.F./0.87 ACRE y 6`�
DRAINAGE AREA 10A6,526 S.F./0.15 ACRE J poi
FUTURE
LAVENDER NiIIRE
® HEIGHTS SUBDIVISION (TO TEMPORARY POND) PDDL z° d = o
50,332 S.F./1.16 ACRE I srrf n +•+ ExisnNCEesz °fa4 7 '�} ; f1, mg���1' F��
EkIGH S LAVENDER
FUTURE LAVENDER NEIGHTB SUBD.NO.1 --- t 1 <'_- aB T- I44
HEIGHTS SUBDIVISION fi�11 ._ • 9 ` -1 !\\ N7UREEPHENOMENAL S7. ] a j y o_
DItOA ®mm-m m®® �®EPm HIE®ENA1® -� i_-_- DRAINAGE AREA 48 ! E•HIOC •� A
UNPLATTED �.. NTURE DI LOB' ® `� 14,880 S.F./0.34 ACRE
MI
STING LAVENDER
d�� -_�_ HEIGHTS SUBD.NO.1
T ` 4s
1 DRAINAGE AREA 106 ®y _ snNCAu
Ez7snNG LAVENDER } } 86,545 S.F./1.99 ACRE ® 1 �' •` l DRAINAGE AREA 3 !
L-I HEIGHT33UBD.N0.1 2 O /1 72,844 S.F./1.67 ACRE 1g�K6
411 ®I ( I ® 1®\ v 3
� _ eLDCKz DRAINAGE AREA 106 ® DRAINAGE AREA 2A �+.� : n 42 uNPLATTED cm
OLD&1 76.902 S.F./1.77 ACRE f A 1s
® QO TEMPORARY POND) 7 s ?LZEY
56,862S.F./1.31ACRE • ! EXISTINGUVENDER
` E45PN6 LAVENDER ® HEIGHTS SUBD.NO.1
EXIST.TEMPOflABY ® 1 e}j
DRAINAGE POND. i} } HEIGHTS
1 vAEA9A
TOP POND=2754.50
BTTM POxD=z7s1sB � I- B.bsnmcg !L DRAINAG E AR 58,373 S.F./1.34 ACRE _
''1.;50_(F.Z� /
} + a BLODKi s �i � ,®012q 16
s � - 3r 552��� 0f2B 17 16 { N
DRAINAGE AREA LEGEND - z DRAT GE AREA 2B 4 E VA1fNsbtEKr 46zoo
2A DRAINAGE AREA IDENTIFICATION NO. '__ �, -'�,_ 10 133,977 S.F./3.08 ACRE ` asr,
!f „ EXISTING LAVENDER it ® Cc O
9mu0.00 AC DRAINAGE AREA(ACRES) I "I I+ + 'ZI '` _ ' 14 HEIGHTS SUBD.N0.1 20 TSB o_ Of GB -
NDRTH ®®®®® DRAINAGE AREA BOUNDARY ` ^ ^` •ft 6 59 w
is i
22
BLDgKi ® DRAINAGE AREA9B o
m� � �`W:`_= ^e-s® 2® 2 23 147,330S.F./3.38ACRE ® -.`+._
DRAINAGE AREA PLAN UNPLATTED "�' '^ °"E 26 sz ® @3
SCALE,1"=80'-0"HORIZONTAL I
120 Bo d0 0 8B 160 i 1 `� �.. a7 ® W
�L �. - Y 2
I � I FUTURE LAVENDER i �� �- "`� 31 ® DRAINAGE AREA SW3
HORIZONTAL SCALE IN FEET I / HEIGHTS SUBDIVISION -`- '�
��� f I �-„•� 4 36,467 S.F./0.84 ACRE
W
DRAINAGE AREA IA B i IF _ 4 ���^y BL19K1
DRAINAGE AREA I I
10,601 S.F./0.24 ACRE 28,932 S.F./D.66 ACRE I -----_J z_I s���`� t,��� ij,�
< m �_
BLACK ®mmm ••�^ \ \
-EXIST.SB 1-- 30.•. a.. ..w - ,.:.
1 I
_ _..._r- 11 ♦ i .+-_._>_ n-s-s-`v._. �_, w ___.-__-_s_ PROJECT NO. 21-0204-LN2
u,, ®a..n E.LAKE HAZEL RD. -'�
--_-_-_--_-_-___ -�.,._,�. ._..,�. ...�-a- } ym>FRA m-✓i1 - ;4�iim-m \ DWG FILE D.1O0
. __ DESIGNED BY FT
---�--- -----a-----.. -- - p, /�''� -- -�-DRAINA6E AREA LAKE HAZEL SWALE 17� ��1 /* DRAWN BY JTA
---- -__-_ __--_. f v 60,139 S.F./1.38 ACRE CHECKED^•�\
f IMPERVIOUS=31,864 S.F. ISSUEDATE BT
ISSUE DATE O2J77/21
GFIV OF MERIDIAN
PARK SITE HORIZ.SCALE AS SHOWN
VERT.SCALE AS SHOWN
A. ■
SHEET OF 1
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