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• Board Meeting Date: 1/23/2008
• Description: ISF Section - Injury with Mitigation - Case No. 3-99CW34; application of Charles E. Nearburg
• Board Meetings - Doc Type: Memo

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The modeling of Trout Creek at Station 2 indicates that one CWCB criterion (velocity) is met at
6 cfs. Two of the CWCB criteria (velocity and wetted perimeter) are met at 10 cfs) and three ar~
met at 24 cfs (see Table 2).
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Table 2, which summarizes the modeling results at 6) 10, and 15 cfs) shows that 69% and 67% of
the average depth and % wetted perimeter criteria, respectively, are met at 6 cfs. The average
depth criterion is not met at any of the flow levels.

Table 2. Modeling Results for Station 2 With Low Flow Mannings Coefficient

6 cfs: Average depth (ft) 0.31 0.45 69
% Wetted perimeter 36 53 67
Velocity (fps) 1.19 1.0 119
10 cfs: Average depth (ft) 0.30 0.45 67
% Wetted perimeter 61 53 115
Velocity (fps) 1.18 1.0 118
15 cfs: Average depth (ft) 0.36 0.45 80
% Wetted perimeter 69 ....... .......--.. '-~~-----o-_--'-- 53 130
Velocity 1.32 1.0 132

. (1) Criteria based on bankfull discharge of 142.65 cfs at Station 2.

Caster Ditch

Cross section data was collected on Caster Ditch and streamflow was measured to develop an
accurate M31m.ings coefficient for modeling. The Mannings coefficient developed was 0.033.

Modeling of Caster Ditch indicates that two CWCB instream flow criteria, average depth and
velocity, will be met at 1 cfs, well within what bas been requested. This diversion not only

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