Final Baseline Hydrology Report - October 2012 - Urban Drainage ...

Sanderson Gulch Major Drainageway Plan
Baseline Hydrology Report October 2012
Landscape and Ecology. Channel banks in this reach are
predominately grass species including wheatgrass and
fescue. Invasive species include Russian olive, thistle,
kochia, smartweed, bindweed, prickly lettuce, common
mallow, barnyard grass, Johnsongrass, pigweed, rag weed,
curly dock and alfalfa.
Maintenance. Routine and emergency maintenance
responsibilities are performed by the City of Lakewood and
UDFCD to maintain channel capacity and provide repairs
after a storm event.
Landscape and Ecology. Grass species making up the
channel banks are predominantly wheatgrass and fescue.
The corridor is narrow and linear with few trees. Where
trees do exist, Russian olive is the most prevalent species.
Invasive species include thistle, kochia, smartweed,
bindweed, prickly lettuce, common mallow, barnyard grass,
Johnsongrass, pigweed, rag weed, curly dock and alfalfa.
Maintenance. Routine maintenance responsibilities are
generally performed by UDFCD to maintain flood capacity
and provide repairs after a storm event.
Parks and Recreation. There is no public access, public
park or open space facilities within Reach NS2. Pedestrian
and bicycle connections are achieved on the local
residential street network in the neighborhood.
The concrete channel bottom is severely
eroded in some areas.
Parks and Recreation. No public access, public parks or
open space facilities are provided within Reach NS3.
Pedestrian connections are achieved on the local
residential street network in the neighborhood.
North Sanderson Gulch upstream of Alison
Street. The channel is trapezoidal with a
concrete pan.
Water Quality. This concrete lined reach does not provide water quality treatment. The narrow corridor
provides little opportunity for future water quality treatment options.
Reach NS3 – S. Wadsworth Boulevard to S. Balsam Court (Lakewood)
Water Quality. This concrete lined reach does not provide water quality treatment. The narrow corridor
provides little opportunity for future water quality treatment options.
Reach NS4 S. Balsam Court to S. Garrison Street (Lakewood)
Reach NS3 is similar in character to the downstream Reach NS2. The channel is contained within a 36-foot
wide drainage easement with no public access. The channel has 2H:1V grassed side slopes and a 4-foot
width concrete invert. The concrete invert is significantly deteriorated in areas. The Wadsworth crossing
has been upgraded to nearly 100-year capacity. The S. Allison Street crossing provides nearly 100-year
capacity. The open channel portion of North Sanderson Gulch ends at W. Florida Avenue where a 36-inch
diameter storm pipe discharges to the head of the channel.
This upstream-most reach of North Sanderson Gulch is approximately 3,400 feet in length and consists of a
24- to 36-inch diameter pipe in W. Florida Avenue. The pipe system begins at S. Garrison Street at the
outfall of Robbins-Dasher Lake in Green Gables Park and extends down W. Florida Avenue to discharge
into the open channel at W. Florida Avenue just east of S. Balsam Court.
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