PROJ00435

• Contract/PO #: C153399
• Contractor Name: Sedgwick-Sand Draws Watershed Conservancy District
• Contract Type: Loan
• Water District: 64
• County: Sedgwick
• Bill Number: SB 81-439
• Loan Projects - Doc Type: Feasibility Study

Works of Improvement

for structures SS-l and ss-4 which are on State land. Improvements that
will have to be altered or relocated at the structure sites are windmills
on sites SS-2, 3, 5, 7 and 8, and a county road on site SS-3.

Floodway Structures

The three floodways included in the structural measures ~re Floodways I
and 2 connecting the Highline Canal to the South Platte River, and the
Ovid Floodway extending from Highway 138 around the southwest side of
/ Ovid, Colorado to the South Platte River.

Floodway I follows an existing floodway and irrigation drop ditch be-
tween the Highline Canal and Petersen Ditch. A new and/or enlarged
floodway outlet from the Petersen Ditch to the South Platte River wi 11
be requi red. Floodway,2 is new and will util ize the borrow ditch along
county and state roads where possible.

Floodways use existing railroad and state highway bridges. Three new
county road 'bridges, seven farm bridges and one Ovid street bridge will
be rec;u ired. The Town Counct.l of Ov i d wi 11 move or relocate ci ty ut i 1 it i es
as required for construction of the Ovid Floodway.

All floodways will have maintenance roadways built on one side wherever
they are not adJacent to an existing road. Floodway I crosses the
'---Sedgwtck-8<rr-St<lTe\itHdllfe ,A rea-ana- wi11-nave a ma I n tenance roao on t he
west side and a grouted road crossing on the riprap at the lower end of
the floodway.

Design Capacity

Floodways I and 2

The Highline Canal intercepts floodwater, runoff from the area
above it. During maJor storm activity, irrigation flows will
be shutoff at the outlet from the Julesburg Reservoir to vacate
canal capacity and make it possible to handle flood inflows.

Floodways I and 2 have been provided to convey excess floodwater,
to the South Platte River. The floodways are located at points
along the canal where the sum of the maximum low stage principal
spill~ay flows from a group of the dams reach the safe capacity of
the canal. This resulted in Floodway I handling the discharge from
five of the floodwater retarding structures and Floodway 2 handling
the discharge from four of the floodwater retarding structures.
Structure SS-8.5 is contained by the Highline Canal.

39