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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O~1775

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h precipitation record at Limon of 52 years ;'IaS used to
determine frequency precipitation values. These values ccr"pared
favorably wit~ those in Heather Bureau Technical Paper ao, 40
and the six-hour precipitation frequency maps developed for
Colorado. The following table gives precipitation and runoff
for selecte~ frequencies:

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Inches of Runoff
Six-Hour Present Cond, Future Condition
Frequency Precipi tation 1'1/0 L,T, and With L, T, and
in Percent Inches 79 Curve No, 77 Curve No,
1 3,6 1.6 1,5
2 3,2 1.3 1,2
<1 2,9 1.1 I,D
10 2.3 0.7 0,6

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The total floodwater-retarding storage capacity for the three
Class "cu structures is 1,778 acre-feet or 2,5 inches of runoff
from the above structures, This storage amount is in excess to
the minimum requirements shown in the Table above, Therefore, each
structure will adequately control the runoff from stonns greater
than the laO-year frequency without appreciable emergency spillway
discharge,

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Area and depth of flooding were based on depth-discharge
frequency curves prepared for 27 cross sections, These sections
were located at selected points throughout the overflow area,
Depth of flooding for damage appraisals was based on cmnputed
"ater surface profiles for various flood frequencies, This
analysis was verified or adjusted where necessary by data obtained
from local residents on historical flood events, All property and
improvements subject to flood damages were related to the above
data in making the detailed flood damage appraisals,

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Several culverts along the channels below the proposed
structures through the residential section of the Town of Limon
are not adequate to accommodate the routed flow from a storm having
a recurrence interval of 100 years, The Town of Limon Street
Department has agreed to replace these culverts with adequate sizes,
These will provide more flood protection prior to the construction
of the floodwater-retarding structures.

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