WSP05425

• File Number: 8101
• Description: Arkansas River Basin Description
• State: CO
• Basin: Arkansas
• Water Division: 2
• Date: 9/1/1962
• Author: High Plains SCD
• Title: Watershed Work Plan - Limon Watershed Protection Project - Elbert and Lincoln Counties - Colorado
• Water Supply Pro - Doc Type: Report/Study

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- 18 -

EFFECTS OF WORKS OF IMPROVEMENT

The three floodwater-retarding structures will provide a high
level of protection to the lands and improvements in the area subject
to damage, The floodwater runoff resulting from the 100-year frequency
storm over the area above the structures will be contained in the
reservoirs, During such a storm, the principal spillway discharges
from the structures plus the routed 100-year frequency peak inflows
from the unreservoired area will not exceed the flood channel
capacities through the damage area in and adjacent to the Town of
Limon.

All floodwater and sediment damages resulting from overbank
flow will be eliminated for storms up to and including the 100-year
frequency storm. Damages fram flood events of greater magnitude
than the project design flood will be materially reduced,

The land use in the overflow area shows the following percentages
of use: municipal, commercial and residential, 35; agricultural, 60;
and miscellaneous, 5,

The overflow area subject to flooding from the project design
flood is estimated to be 403 acres and this will be reduced to
within channel flows with the project installed, Urban property
benefited includes 148 residences, 36 corrmercial buildings, and
35 municipal items which include three of the six public school
buildings and two churches,

There will be some temporary minor accumulations of floodwater
in the floodplain area in the lower part of town on portions of
several blocks. This is caused by runoff fram the city buildings
and streets for which town storm sewers and street gutters do not
have adequate capacity to entirely remove peak flows (Figure I -
Damage Map). Sediment and debris removal will be the principal
damage to seven lawns, one tourist court, one gasoline bulk plant,
and to about three city blocks of streets.

The present proposed location of Interstate Highway 70 crosses
the watershed along the north corporate limits of Limon. If the
proposed watershed project is approved for construction and final
designs are made prior to those for this section of Interstate
Highway 70, a definite saving can be made in the construction of
Highway culverts,