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XII-2 the rryer. The river is rural in nature and is highly dynamic.. There are numerous areas of river instability as evidenced by river bank caving and bed degradation. ALTERNATIVES A total of nine alternatives were considered for each of the reaches. Not all of the alternatives were studied in detail for each reach, however. In some reaches it was determined that only a few of the available alternatives would be practical. The alternatives studied for each reach are presented on Table XII-I. The alternatives were chosen on the basis of the definition of flood problems performed as part of this Master Plan study. Alternatives studied include the do nothing alternative, natural type water- way, 1 ined channels, 1 imited structural improvements, land acquistion or floodplain relocation, non-structural, channel relocation, other, and com- binations of the above. All alternates include the enforcement of adequate floodplain regulations within the jurisdictions along the river. These alternatives will be more fully described below. Do Noth i ng In the do nothing alternative the existing channel and floodplain conditions will be maintained. This alternative serves as the baseline condition against which all the other alternatives are measured. Flood and erosion damage estimates were made based on the do nothing (existing conditions) alternative. Damages calculated for the other alternatives were subtracted from the existing condition damages to determine the net benefit of any particular alternative. It is assumed that because of floodplain regulations there will be no in- crease in flood damages due to increased development on the floodplain. Any increases in damage would be the result of inflation or changes to the flood s ituat ion. A lternat i ve 1. 2. 3. 4. 5. 6. 7. 8. 9. Maintain existing configuration Natur a 1 type waterway Li ned ch anne 1 s Limited structural improvements Acqui sit i on of floodpl ain 1 and Non-structural Relocation of channel Other Combinations Alternative 1. Maintain existing configuration 2. Natural type waterway 3. Lined channels 4. Limited structural improvements 5. Acquisition of floodplain land 6. Non-structural 7. Relocation of ch anne 1 8. Other 9. Combinations *Large lake scenario TABLE XII-1 nITCDNnTT\/CC rnMCTn~D~n ru...' L..1\11r\1.I. .L....,.I ....VI'.....J.Vl-nL..LJ Reach 1 Chatfield to Columbine Yes Yes No No No No No No AlL 2 incls. some channel 1 ining Reach 5 Colfax to Cherry Cr. Yes No Yes Yes No Yes No No Alt. 4 i n- eludes ch anne 1 1 ining Reach 2 Columbine to Oxford No No Corps proj ect No No No No No Alt. 3 is recommended alternative Reach 6 Cerry Creek to Franklin Yes No Yes Yes No Yes No No Reach 3 Oxford to Bates Yes Yes No No No No No No Alt. 2 in- cludes some channel lining Reac h 7 Frank 1 in to Sand Creek Yes No Yes Yes No Yes No No Alt. 4 in- cludes some channel lining Reach 4 Bates to Colfax Yes No Yes Yes No Yes No No Alt. 4 in- eludes channel lining Reach 8 Sand Cr eek to Baseline Yes No Yes No No No Yes* Alt.8&3 combi nat ion engi neered channel and 1 akes