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NED Alternative » Description of NED Plan
National Economic Development (NED) Alternative = the alternative that reasonably maximizes net economic benefits.
Provides the most benefit compared to the costs.
The NED plan for Clear Creek watershed includes channel improvements and a detention basin for a flood risk management project
(see exhibit below).
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NED Benefits & Costs
The NED Plan is estimated to have an initial cost of $167.4 million and fully funded cost of $ million. The NED Plan maximizes the
average annual net excess economic benefits. This maximization of the Federal investment will provide approximately $22.2 million in
annualized benefits with an annualized project cost of approximately $9.0 million. The resultant benefit-to-cost ratio is approximately
2.5.
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NED Benefits: Homes/Businesses Flooded (Structures)
1% (100-Year)
| Flood Event |
Existing |
With Project |
Flood Plain Removed From # Of Structures |
| Mainstem |
1,740 |
817 |
923 |
| Mary's Creek |
756 |
272 |
484 |
| Mud Gully |
635 |
42 |
593 |
| Turkey Creek |
246 |
2 |
244 |
| Total |
3,377 |
1,133 |
2,244 |
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10% (10-Year)
| Flood Event |
Existing |
With Project |
Flood Plain Removed From # Of Structures |
| Mainstem |
369 |
109 |
260 |
| Mary's Creek |
160 |
32 |
128 |
| Mud Gully |
1 |
0 |
1 |
| Turkey Creek |
1 |
0 |
1 |
| Total |
531 |
141 |
390 |
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** Excludes Structures previously bought-out by FEMA
NED Benefits 1% (100-Year)
Change in Flood Levels
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NED PLAN STRONG POINTS
Flood Risk Management
- Focuses on the highest flood damage areas along Clear Creek and the tributaries.
- Reduces flood risks significantly
- Reduces flood levels and mitigates conveyance improvementsthrough detention
- No increases in flood risk anywhere along Clear Creek or Clear Lake
- Provides good foundation for local entities to build on
Environmental Benefits
- Avoids environmentally sensitive reaches
- Linits conveyance improvements to upstream reaches already channelized
- Preserve and restores desirable environmental habitat along existing channel through recommended high level flood benches
- Preserves riparian forests, where possible
- Restores forests where home buyouts occurred
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NED Measures
Storm Water Detention
– Clear Creek
¤ 500 acre-feet - Inline
¤ 1,750 acre-feet - Offline
– Mud Gully
¤ 1,550 acre-feet - Offline
– Mary's Creek
¤ 900 acre-feet - Offline
Conveyance Improvements
– Clear Creek (High Flow and
By-Pass)
¤ SH 288 to 4,000 ft
downstream of Bennie Kate
¤ 4,000 ft downstream of
Bennie Kate to Dixie Farm
– Mud Gully
¤ Sagedowne to Astoria
– Turkey Creek
¤ Dixie Farm Road to Clear Creek
– Mary's Creek
¤ Harkey Road to SH 35
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