DWR_3193699

• Document Date: 12/21/2017
• Document Type - Dam Safety: Report
• Division: 5
• Dam ID: 530212
• Subject: COPPER SPUR DAM - SPILLWAY ADEQUACY ANALYSES
• DWR Send/Recipient: JACKIE BLUMBERG, ALAN MARTELLARO

Saturated Hydraulic Conductivity (Ksat), Standard Classes—Grand County Area, Colorado;
and Routt Area, Colorado, Parts of Rio Blanco and Routt Counties
Copper Spur
Description
Saturated hydraulic conductivity (Ksat) refers to the ease with which pores in a
saturated soil transmit water. The estimates are expressed in terms of
micrometers per second. They are based on soil characteristics observed in the
field, particularly structure, porosity, and texture. Saturated hydraulic conductivity
is considered in the design of soil drainage systems and septic tank absorption
fields.
For each soil layer, this attribute is actually recorded as three separate values in
the database. A low value and a high value indicate the range of this attribute for
the soil component. A "representative" value indicates the expected value of this
attribute for the component. For this soil property, only the representative value is
used.
The numeric Ksat values have been grouped according to standard Ksat class
limits. The classes are:
Very low: 0.00 to 0.01
Low: 0.01 to 0.1
Moderately low: 0.1 to 1.0
Moderately high: 1 to 10
High: 10 to 100
Very high: 100 to 705
Rating Options
Units of Measure: micrometers per second
Aggregation Method. Dominant Component
Component Percent Cutoff. None Specified
Tie-break Rule: Fastest
USDA Natural Resources Web Soil Survey 12/21/2017
Conservation Service National Cooperative Soil Survey Page 4 of 5
Map unit symbol
Map unit name
Rating (micrometers
Acres in AOI
Percent of AOI
persecond)
191
Perfecto very stony
78.6320
1.8
0.1%
sandy loam, 25 to 65
percent slopes -
DRAFT
AW
Venable mucky peat, 0
203.0000
89.4
3.4%
to 3 percent slopes -
DRAFT
RRS
Rock outcrop-
8.7
0.3%
Rubbleland complex -
DRAFT
Subtotals for Soil Survey Area
2,587.1
99.5%
Totals for Area of Interest
2,599.9
100.0%
Description
Saturated hydraulic conductivity (Ksat) refers to the ease with which pores in a
saturated soil transmit water. The estimates are expressed in terms of
micrometers per second. They are based on soil characteristics observed in the
field, particularly structure, porosity, and texture. Saturated hydraulic conductivity
is considered in the design of soil drainage systems and septic tank absorption
fields.
For each soil layer, this attribute is actually recorded as three separate values in
the database. A low value and a high value indicate the range of this attribute for
the soil component. A "representative" value indicates the expected value of this
attribute for the component. For this soil property, only the representative value is
used.
The numeric Ksat values have been grouped according to standard Ksat class
limits. The classes are:
Very low: 0.00 to 0.01
Low: 0.01 to 0.1
Moderately low: 0.1 to 1.0
Moderately high: 1 to 10
High: 10 to 100
Very high: 100 to 705
Rating Options
Units of Measure: micrometers per second
Aggregation Method. Dominant Component
Component Percent Cutoff. None Specified
Tie-break Rule: Fastest
USDA Natural Resources Web Soil Survey 12/21/2017
Conservation Service National Cooperative Soil Survey Page 4 of 5