PERMFILE128149

• Permit No: M1989065
• IBM Index Class Name: Permit File
• Doc Date: 8/15/1989
• Doc Name: HALLETT MATERIALS WINKLER QUARRY WILLOW CREEK OPEN CHANNEL FLOW CULVERT TAILWATER
• Media Type: D
• Archive: No

HALLETT MATERIALS - WINKLER QUARRY TA 88-146
DRAINAGE REPORT 08/15/89
RATIONAL METHOD STORM RUNOFF SUB-BASIN B
=
TIME
OF CONCENTRATION
INITIAL (OVERLAND) TIME
L = 500 FT OVERLAND DISTANCE IN FEET
S = 1.0 $ SLOPE IN PERCENT
C5 0.10 OPEN AREA - CLAYE Y SOIL
Ti = 40.25 MIN 1.8*(1.1-C5)*( L )'.5 / ( S )"1/3
(UDFCD CRITERIA MANUAL)
TRAVEL TZME
L = 2,100 FT TRAVEL DISTANCE IN FEET
S = 1.3 8 SLOPE IN PERCENT
V = 1.7 FPS ( S ) 2 CURVE FIT SCS VEL CURVE
Tt = 20.71 MIN DISTANCE / VELOCITY
Tc = 60.96 MIN Ti + Tt
C2 C5 C10 C100
RUNOFF UDFCD
COEFFICIENTS 0.05 0.10 0.20 0.40 CLAYEY SOIL
AREA 63.2 acr es
RAINFALL I2 I5 I10 I100
INTENSITIES DOUGLA S COUNTY
(INCHES/HR) 1.06 1.43 1.66 2.60 ZONE I
Q2 Q5 Q10 Q100
PEAK RUNOFF
(C FS) 3.35 9.04 20.98 65.73 Q = c i A
ONE-HOUR V2 V5 V10 V100
VOLUME
(CUBIC FT) 12,251 33,056 76,744 240,404 V = Q* Tc (FAA)
(ACRE*FEET) 0.28 0.76 1.76 5.52