FLOOD00310

• County: Arapahoe
• Stream Name: South Platte
• Title: Union Avenue Boat Drop
• Date: 1/1/1983
• Prepared For: CWCB
• Prepared By: CWCB
• Floodplain - Doc Type: Floodplain Report/Masterplan

..

Table 3. Total surface area of stream and (weighted
usable surface area) for a hypothetical
recreation activity in square feet.

t

Depth (ft)
and
(Probability-
of-use)
<1
(0)

1-2
(0.3)

2-3
(0.8)

>3
(1. 0)

Totals

Velocity in feet per second and (probability-of-use)

<0.5
(1. 0)
500
(0)

600
(180)

100
(80)

o
(0)

1,200
(260)

0.5-1.0
(0.8)
400
(0)
700
(168)
300
(192)
o
(0)
1,400
(360)

1. 0-1. 5
(0.4)
100
(0)

800
(96)

500
(160)

100
(40)

1,500
(296)

>1. 5
(0)
o
(0)
300
(0)
100
(0)
o
(0)
400
(0)

Total

1,000
(0)
2,400
(444)
1,000
(432)
100
(40)
4,500
(916)

A separate matrix is required for each recreation activity being
considered. A separate matrix is also developed for each of a number of
different fl ows and a different wei ghted usable surface area is ca 1 cu-
lated for each flow. Comparison of the matrices provides information on
the "best flow" or shows the change in weighted usable surface area due
to a change in flow.

RECREATION CRITERIA FOR THE INCREMENTAL METHOD

Recreation activity definitions and a discussion of criteria are
presented be 1 ow.

Minimum and Maximum Criteria

Criteria, as discussed in this section, refer to the parameters of
depth and velocity, and deal with the minimum and maximum values. The
assumption is made that the recreation activity in question cannot be
engaged in outside of the range described by the minimum and maximum
values. Optimum values are determined in a somewhat different manner
and will be discussed later. Minimum and maximum criteria are of two
major types: (1) physical criteria and (2) safety criteria. Regarding

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