20070001 Ver 1_Stormwater Plans_20061228

DRAINAGE CALCULATIONS
FOR
STORMWATER MANAGEMENT DEVICES (BMP's)
BUFFER VARIANCE FOR
LOT 31 IN CAI~CRIAGE HILLS SUBDIVISION
in
CITY OF RALEIGH, NC
~ BRL ENGINEERING
704-8 t:ast Stanley Street
Four Oaks, NC 27524
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Worksheet
Worksheet for Trapezoidal Channel
Project Description
Worksheet Q2 Grass Swale .c- G hcc~ Q2 F; ~s7` ,f•nec ~A~'s /s Gs~u-=!/ Mo%c 0~'{`~%~~/f T~ .T tisf TA~~
Q/P ~
Flow Element Trapezoidal Cha
Method Manning's Form
Solve For Channel Depth
Input Data
Mannings Coeffic 0.030 ~- Grass f'l~~rc~Y.~
Channel Slope 010000 ft/ft E-- pcs%~~ S~~Pc ° - S7• t- J.o ~ , ureA r~1ay. i
Left Side Slope 3.00 H : V
R(ght Side Slope 3.00 H : V
Bottom Width 2.00 ft s- M; ,,, Oss~~+bfe B+se
Discharge 0.75 cfs
Results
Depth 0.20 ft
Flow Area 0.5 ft'
Wetted Perim 3.26 ft
Top Width 3.20 ft
Critical Depth 0.15 ft
Critical Slope 0.026718 ft/ft
Vebcity 1.45 ft/s E-- ~Z.o ;_ G~~ss cK- N~ L%~%~ ,4~,..;~~d _ Check Qio---
Velocity Head 0.03 ft A~l.w~blt
Specific Enerc 0.23 ft
Froude Numb 0.64
Flow Type 3ubcritical
Notes: 02 Grass NO Lining: Best Section (Slope; Base; & Sidesiopes) By Trial ~ Error to Keep Q2 < 2 ft/sec
--___.>
Projed Engineer: Brian Rentz Leonard
c:\...klesign\ditches\108015-01-dftches.fm2 BRL Engineering FlowMaster v7.0 [7.0005]
12/22/08 10:08:31 AM car Haestad Methods, inc. 37 Brookside Road Waterbury. CT 08708 USA [phone] Page 1 of 1

Worksheet
Worksheet for Trapezoidal Channel
Project Description
Worksheet 010 Grass Swal
Flow Element Trapezoidal Cha
Method Manning's Form
Solve For Channel Depth
Input Data
Mannings Coeffic 0,030 E- Gress (L+~se.v, )
Channel Slope 010000 ft/ft .cam Desr!-, s'i pc .. S,L y. /.07, ~ vse.r MtY
Left Side Slope 3.00 H : V
Right Side Slope 3.00 H : V F/NAL Oj=Slbti/ SEGTtn~-l s« 8G/e,,.~
Bottom Width 2.00 ft
Discharge 1.84 cfs
Results
Depth 0.32 ft
Flow Area 1.0 ft'
Wetted Perim 4.05 ft
Top Width 3.95 ft
Critical Depth 0.26 ft
Critical Slope 0.023102 ft/ft
Velocity 1.90 ft/s E- Y`a ~-4..5~ .: Gr.a oK, Na L,~; Q<4~.'~~~
Velocity Head 0.06 ft rlax Allowb/e
Specific Ener[ 0.38 ft ~~ bass
Froude Numb 0.68
Flow Type 3ubcritical
Notes: 010 Grass NO Lining: Best Section (Slope; Base; ~ Sideslopes) By Trial 8 Error to Keep 010 < 4.5 ft/sec
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Sptcify: Co~slns+t Slepc - t'1%n, Otp/1o
Project Engineer. Brian Rentz Leonard
c:\...klesignldkches\106015-01~iitches.fm2 BRL Engineering FlowMaster v7.0 [7.0005]
12/22/06 10:15:41 AM ®Haestad Methods, Inc. 37 Brookside Road Waterbury, CT 06708 USA t1-203-755-1666 Page 1 of 1

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