Revised Final Environmental Study Report (24 MB) - Gold Canyon ...

BRIDGE SITE DATA FORM – EXISTING CONDITIONS
Deaddog Creek, Springpole Camp Trail, Gold Canyon Resources
prepared by Bruce Adamson, October 13, 2012
A = Floodplain Width = 138 feet Measured Stream Velocity =
B = Bankful Width = 14 feet Date velocity measured on:
C = Channel Width = 14 feet Watershed:
D(l) = Depth at 25% of Channel = 0.55 feet Drainage Area = 14.7 sq km
D(c) = Depth at 50% of Channel = 0.55 feet Lake Area = 2.94 sq km
D(r) = Depth at 75% of Channel = 0.55 feet Wetlands Area = none
E = Depth of Bankful Flow = 1.5 feet Slope = 0.0031 m/m
F = Depth of Floodplain = 5.55 feet Design Flow (Q 25 ) = 3.3 m 3 /sec (MNR
PROPOSED BRIDGE DIMENSIONS: TYPE A TYPE B X TYPE C or SEE ATTACHED SKETCH X
G = Bridge length = 30 feet Estimating Waterway Capacity
H = Clear opening width = 24 feet Bridge opening area below 0.5 m freeboard = 3.4 sq m
I = Freeboard (min. 0.5 m) = 1.6 feet
Manning’s equation
J = Flood rise = 5.0 feet Manning’s ‘n’ = .
K = Fill height = 6.7 feet Channel Slope = m/m
L = Left slope length = 6.0 feet (north side) Calculated velocity = m/sec
M = Left slope rise = 2.2 feet
Measured flow velocity = ___________ m/sec
N = Right slope length = 6.0 feet (south side) X Assume 1 m / sec flow velocity
O = Right slope rise = 2.2 feet Waterway capacity (Bridge opening area x velocity)
P = Crib width = 8.0 feet = 3.4 m 3 /sec (must be > Q 25 ) + 0.5 m freeboard