Indicator Table

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Directions

Generic

Specific

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Directions

This table compares attributes and impacts of alternatives. A matrix table showing all indicators and alternatives provides the public and decisionmakers with a quick way to determine which alternative will do what. This helps display all of the analyses in a comprehensive, understandable way.

1. Identify the significant issues.

    

2. Find particular indicators (a small resource or issue that can be measured) that generally reflect impacts to each resource. For example, the amount of flows at Quarry Rapids may indicate rafting quality for the entire Crystal River, or levels of Cladophora may show the relative abundance of native fish.

    

3. Show why an indicator was chosen and how it interacts with the resource as a whole.

    

4. Decide on the alternatives to be compared.

    

5. Measure impacts to the indicators consistently under all alternatives.

    

6. Identify which indicators will be used to show those issues.

Generic Table

Agree on indicators that mean something to the decision and can be tracked.

Summary of anticipated impacts on [RESOURCE] by alternative

RESOURCE	No Action	Alternative	Alternative
Indicator Measurement Unit
Indicator Measurement Unit
Indicator Measurement Unit
Indicator Measurement Unit

Specific Example

Table IV-6.--Summary of anticipated impacts on SEDIMENT by alternative
SEDIMENT	No Action	Maximum Powerplant Capacity	High Fluctuating Flow	Modified Low Fluctuating Flow	Interim Low Fluctuating Flow
Riverbed sand (percent probability of net gain) After 20 years After 50 years	50 41	49 36	53 45	64 73	69 76
Sandbars (feet) 1 Active width With habitat maintenance flows Potential height 2 With habitat maintenance flows 3	44-74 10-15	47-77 10-16	33-53 7-11	24-41 41-66 6-9 9-14	24-41 6-9
High terraces (adjacent to river) Frequency of flood erosion	1:40	1:40	1:100	1:100	1:100
Debris fans and rapids River's capacity to move boulders as a percentage of 1983 flood capacity	12	13	12	10	5
Lake delta (crest elevation in feet) Lake Powell Lake Mead	3662 1167	3662 1167	3662 1167	3662 1167	3662 1167
All values calculated for 8.23 maf annual release and include effects of flood frequency reduction, as appropriate. Effects of beach/habitat-building flows are not included (see text). 1 Active widths and potential heights do not take into account the availability of riverbed sand. 2 Difference in water-surface elevations at minimum and maximum flow. 3 Difference in water-surface elevations at minimum flow and 30,000 cfs.

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Analysis

Indicators