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STREAM DESCRIPTION and CLASSIFICATION DATA
Reference Strerm
Item Existing Strcana (Prof. R-2610A) Proposed Stream
Stream Name Trib. To Third Creek Trib. "fo Cedar Crcek,Chatham Co. Trib. To Third Crcck
-Y8- Sta 14i 10 LT. to 15+17 R1'. -Is Sta 68 t451L to 69 ~ 80 lt_ -Y8- Sta 14+10 LT. to 15+17 RT.
Drainage Arca (DA) 230 Ac 168 ac 230 Ac
0.36 sq.miles 0.26 sq.miles 0.36 sq.miles
Channel Slope (Sc) O.OI 1 fi/fi 0.018 fUR O.OI 1 fi/fi
Valley Slope (Sv) 0.014 fVfi 0.019 fUfi 0.014 fl/fl
Bankfull Width (Wbkf) 7 fi 11 ft 14.5 fi
Bankfull Mcan Depth (dbki) 0.7 fi 0.8 fi 1.5 fi
Bankfull Xsection Area (Abkf) 4.5 sq.ft 9 sq.fi 22 sq. fi I
~
Width /Depth Ratio (Wbkfi / dbkf) 9 13 10
Max. Depth (dmbkf) L1 fi 1.3 fi 2.4 I]
WidUr Food Prone Area (Wfpa) .9 fi 20 fi 34 It
Etttrcnchnrent Ratio (Wfpa/Wbki) 1.4 1.8 2.3
Channel Materials: D50 1 mm 1 mm 1 mm
Sinuosity (K) L2 1.1 1.4
Meanders
Avg. Leng4r 204 ft 72 fi l26 ft
Avg. Amplitude 54 fi 23 fi 34 fi
Avg. Radius 21 fi 29 fi 40 ft
llischarges Rural Rural Rura] Urban
Q bankfull l9 cfs 45 cfs 19 cfs 120 cfs
Q2 (USGS Regional P.gns.) 102 cfs 53 cfs 102 cfs 201 cfs
Q 10 (USGS Regional Egns.) 173 cfs 95 cfs l73 cfs 392 cfs
Velocity Rural Urban
V bankfiill 3.4 fi /sec 5.0 fi /sec 3.0 fi /sec 4.2 fi /sec
V2 4.9 ft /sec 5.2 fi /sec 4.8 fi /sec 4.1 fi /sec
V 10 5.8 fi /sec 6.2 fi /sec 4.1 fi /sec 5.0 Il /sec
Classification GS CS in stable upper reach CS
N.C. DEPT. OP TRANSPORTATION
DIVISION Of IIIGIIWAYS
IREDELL COUNTY
PROJECTR.1631801 (R-2911A)
US - 70 FP(wt SR 231 ~ T~ > 12C1WAN CO. LINL'
Ill,1"I'F" 'Y~,. SH};L'f 15 OF 16
STREAM DESCRIPTION and CLASSIFICATION DATA
Item Existing Stream Reference Stream Proposed Stream
Stream Name Trib. To Third Crcck (Same as exist.) Trib. 'I'o Third Creek
-L- Sta 32+07 it. to 32+43 lt. -L- Sta 32+071t. to 32 +43 h. ~
Drainage Area (llA) 153 ac 153 ac
0.24 sq.miles 0.24 sq.miles
Channel Slope (Sc) 0.01 fUft 0.01 fUft
galley Slope (Sv) 0.016 fi/fi 0.016 ft/fi
Bankfull Width (Wbkf) ]0 ft 11 ft
Bankfull Mean Dept}i (dbkQ 1.2 ft 1.3 ft
Bankfull Xsection Arca (Abkf) 11.9 sq.ft 10 sq. ft
Width / llcpth Ratio (WbkII / dbkf) 8 g
Max. Depth (dmbkf) 1.9 fi 2.2 ft
Width Flood Prone Area (Wfpa) 35 ft 37 fi
Entrenchment Ratio (Wfpa/Wbkf) 3.5 3.4
Channel Materials: D50 1 mm 1 nnn
Suiuosity (K) 1.6 1.6
Meanders
Avg. Length 57 ft 59 fi
Avg. Amplitude 23 ft 31 ft
Avg. Radius 21 fi 16 ft
Discharges Rural Rural Urban
Q bankfull 38 cfs 38 cfs 51 cfs
Q2 (USGS Regional Egns.) 67 cfs 67 cfs 141 cfs
Q 10 (USGS Regional Eq~~s.) 113 cfs 113 cfs 286 cfs
Velocity Rural Urban
V bankfull 3.2 fi /sec 3.3 ft /sec 3.5 ft /sec
V2 3.3 ft /sec 2.9 ft /sec 3.1 ft /sec
V 10 3.3 ft /sec 3.0 fi /sec 4.2 ft /sec
Classification ES ES
N.C. DEP"f. OF TRANSPORTATION
DIVISION OF HIGHWAYS
IREDELL COUNTY
PROJECT 8.1631801 (R-291 IA)
US - 70 FROM SR 2318 TO ROWAN CO. LINE
DATE 7/12/02 SIILET 16 OF 16