size drain
DESCRIPTION
DrainageExcelTRANSCRIPT
SIZE OF DRAIN
375width Half Round Glazed Ware Drain (375W HRGWD)
Width = 375 375Slope = 450
Manning, n = 0.015 75 225 75
Half Round Glazed Ware Drain (HRGWD)Figure 1.0 Depth 0.38 m
A1 0.14A2 0.02 depthArea of Drain, A 0.16 m2Perimeter, P 1.13 m
A/P Hydraulic Radius, R 0.143 m
Capacity, Q 0.138 Q/A Velocity, V 0.858 m/s
Total Depth 0.375Road Level 24.36Invert Level 23.99
area O =
== 0.03976 ~ 0.04
area U == 0.04/2= 0.02
AR2/3S1/2 /n m3/s
jП 2
3.142 x ((225/1000) / 2)2
jП 2 /2
450width Half Round Glazed Ware Drain (450W HRGWD)
Width = 450 450Slope = 450
Manning, n = 0.015 75 300 75
Half Round Glazed Ware Drain (HRGWD)Figure 1.0 Depth 2.05 m
A1 0.92A2 0.04 depthArea of Drain, A 0.96 m2Perimeter, P 4.55 m
A/P Hydraulic Radius, R 0.210 m
Capacity, Q 1.064 Q/A Velocity, V 1.111 m/s
Total Depth 2.275Road Level 21.67Invert Level 19.40
area O =
== 0.07070 ~ 0.07
area U == 0.07/2= 0.035
AR2/3S1/2 /n m3/s
jП 2
3.142 x ((300/1000) / 2)2
jП 2 /2
600width Half Round Glazed Ware Drain (600W HRGWD)
Width = 600 600Slope = 450
Manning, n = 0.015 75 450 75
Half Round Glazed Ware Drain (HRGWD)Figure 1.0 Depth 0.20 m
A1 0.12A2 0.08 depthArea of Drain, A 0.20 m2Perimeter, P 1.00 m
A/P Hydraulic Radius, R 0.200 m
Capacity, Q 0.215 Q/A Velocity, V 1.074 m/s
Total Depth 0.425Road Level 15.00Invert Level 14.58
area O =
== 0.1590 ~ 0.16
area U == 0.16/2= 0.08
AR2/3S1/2 /n m3/s
jП 2
3.142 x ((450/1000) / 2)2
jП 2 /2