american samoa - University of Hawaii at Manoa Botany Department

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RIPARIAN RESTORATION AND ENHANCEMENT OPPORTUNITIESGeneralTwo opportunities were identified for the restoration and enhancement of lower Asili Stream.The scope of these restoration and enhancement opportunities, and related implementationstrategies, are presented in the following paragraphs. The potential benefits and impactsderived from the implementation of the recommended strategies are subsequently evaluatedand compared in the following paragraphs.Preliminary cost estimates are presented for the implementation of the recommended strategy.Long-term monitoring and site maintenance requirements associated with the recommendedstrategy are also identified.Opportunities and StrategiesOption 1: Clean Asili Stream and Enhance Riparian VegetationThe initial phase of Option 1 would represent the clean up of solid waste material within thebanks of Asili Stream. More specifically, the cleanup would occur between the stream mouthand station 10+00, the first 1,000 feet upstream of the stream mouth (Figure 10-3). This effortwill require the collection and disposal of a wide variety of solid waste materials. Manualcollection will be sufficient to collect of this material. A larger dump truck may be required tohaul larger materials to the Futiga landfill.Subsequently, The American Samoa Community College, Land Grant Program would initiatethe planting of 25 ifi (Tahitian chestnut) and 25 falaga trees along the banks of Asili Stream.Such plantings would be most beneficial along the margins of subsistence plantations that areadjacent to Asili Stream. Both ifi and falaga trees will help stabilize stream banks and helpdecrease potential downstream sedimentation. It is recommended that tree plantings are madewithin 25 feet of the east and west stream banks except where plantings interfere with adjoiningresidential land uses, or are not authorized by residents living adjacent to Asili Stream.Option 2: Restore Stream Flow Path Upstream of Inhabited Village AreaA change in the path of stream flow immediately upstream of the inhabited village area maygenerate future flood damages to, at least, one residence along the west bank of Asili Stream.Some corrective action will likely be required upstream of station 10+00 to restore the priorpath of stream flow.The construction of riprap upstream of the last residence in the village is recommended to helprestore the former path of stream flow along the west bank of the stream, as well as reducesedimentation that is being generated from the continuing erosion of the west stream bank.Larger basaltic boulders and smaller rock are readily available within the existing stream bed.Consequently, any construction effort would require a modest expense for the material neededto build the riprap. Labor and heavy equipment from the ASG Department of Public Workswould be required to haul selected rock material, from the stream bed to the west bank, andconstruct the riprap structure.Figure 10-3Option 1: Clean Asili Stream and Enhance Riparian VegetationAmerican Samoa Wetlands/Streams Restoration and Enhancement PlanFebruary 2001, Asili Stream, Page 10-10
American Samoa Wetlands/Streams Restoration and Enhancement PlanFebruary 2001, Asili Stream, Page 10-11
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Asili StreamAMERICAN SAMOAWETLAND/S
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American SamoaWetland/Stream Restor
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American Samoa Wetland/Stream Resto
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Figure 1-1Location of Potential Wet
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Onsite InvestigationsNovember 1999G
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Where appropriate, stream cross sec
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Chapter TwoTULA WETLANDLOCATIONTula
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Figure 2-2Tula WetlandExisting Cond
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Improved channelization of stormwat
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LAND USES IN THE VICINITY OF TULA W
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Figure 2-3Option 2: Detention of St
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Figure 2-4Option 3: Expansion of Ta
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Comparative Benefits and ImpactsPPC
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TABLE 2-4PRELIMINARY COST ESTIMATEP
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TABLE 2-5LONG-TERM RESOURCE MONITOR
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TABLE 2-6 (CONTINUED)FIELD MONITORI
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Chapter ThreeALAO WETLANDLOCATIONAl
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Figure 3-2Taufusi MarchExisting Con
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Figure 3-3FEMA 100-Year Flood Plain
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East Portion of the MarshThe impact
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WETLAND RESTORATION AND ENHANCEMENT
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The availability of new, blight-res
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Long-Term Monitoring and Site Maint
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TABLE 3-7FIELD MONITORING WORKSHEET
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Recommended monitoring stations or
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Figure 4-1Location MapAoa Village W
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No stream flow estimates are availa
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Fresh-Water SwampThe fresh-water sw
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ecome dominant if there is a nearby
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Relative Abundance and Diversity of
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Option 4: Restore Mangrove Forest U
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TABLE 4-5COMPARATIVE EVALUATIONWETL
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Long-term resource management activ
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• begin at the Tapua Stream mouth
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Figure 5-1Location MapSoutheast Wet
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Tufu Stream and two stream branches
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Mr. Whistler was part of a three-pe
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InvertebratesCrustacean densities w
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FIGURE 5-3OPTION 1: RESTORE RIPARIA
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TABLE 5-4COMPARATIVE EVALUATIONWETL
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Long term monitoring of the Vatia w
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More specific monitoring of stream
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Figure 6-1Location MapVaipito Strea
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Stream FlowsHistorical Stream Flows
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California grass (Brachiaria mutica
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FIGURE 6-3FISH AND INVERTEBRATE SUR
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Most of lower Vaipito Stream segmen
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Red mangrove should be planted with
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TABLE 6-7PRELIMINARY COST ESTIMATEC
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TABLE 6-9LONG-TERM RESOURCE MONITOR
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TABLE 6-10 (Continued)FIELD MONITOR
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Vehicular and pedestrian access to
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Figure 7-1Location MapLeele-Papa-Ta
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Stream flow, in some cases, is cons
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Stormwater Discharges and Related F
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AQUATIC FISH AND INVERTEBRATESGener
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Opportunities and StrategiesOption
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Figure 7-3Option 2: Reduction of Er
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TABLE 7-8PRELIMINARY COST ESTIMATEP
Page 127 and 128: TABLE 7-9LONG-TERM RESOURCE MONITOR
Page 129 and 130: TABLE 7-10 (Continued)FIELD MONITOR
Page 131 and 132: More specific monitoring of stream
Page 133 and 134: Figure 8-1Location MapSauino Stream
Page 135 and 136: Stream FlowsHistorical Stream Flows
Page 137 and 138: AQUATIC FISH AND INVERTEBRATESGener
Page 139 and 140: Figure 8-3Option 1: Construction of
Page 141 and 142: FIGURE 8-5OPTION 2: PLANT NATIVE RI
Page 143 and 144: Long-Term Monitoring and Site Maint
Page 145 and 146: TABLE 8-8FIELD MONITORING WORKSHEET
Page 147 and 148: TABLE 8-8 (Continued)FIELD MONITORI
Page 149 and 150: LOCATIONChapter NineLEAFU STREAMLea
Page 151 and 152: Figure 9-2Leone Pala and 300-Foot L
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Page 155 and 156: Vegetation TrendsThe lower Leafu St
Page 157 and 158: LAND USES ADJACENT TOLOWER LEAFU ST
Page 159 and 160: Option 2: Construct Basaltic Wall,
Page 161 and 162: Figure 9-5:Stabilize East Stream Ba
Page 163 and 164: TABLE 9-7PRELIMINARY COST ESTIMATEP
Page 165 and 166: TABLE 9-8LONG-TERM RESOURCE MONITOR
Page 167 and 168: TABLE 9-9 (Continued)FIELD MONITORI
Page 169 and 170: Chapter TenASILI STREAMLOCATIONAsil
Page 171 and 172: Figure 10-2Asili Stream SegmentExis
Page 173 and 174: Stormwater Discharges and Related F
Page 175 and 176: Further downstream, the stream chan
Page 177: TABLE 10-4SUMMARY OF MACROFAUNAL OR
Page 181 and 182: CLEAN-UP OF LOWER ASILI STREAMLABOR
Page 183 and 184: TABLE 10-9LONG-TERM RESOURCE MONITO
Page 185 and 186: TABLE 10-10 (Continued)FIELD MONITO
Page 187 and 188: Vehicular and pedestrian access to
Page 189 and 190: Figure 11-1Location MapFusi Wetland
Page 191 and 192: WETLAND VEGETATIONNovember 1999 Sur
Page 193 and 194: The lack of stream flow entering th
Page 195 and 196: Figure 11-3Option 1: Remove Solid W
Page 197 and 198: Recommended Option and Estimated Pr
Page 199 and 200: TABLE 11-6FIELD MONITORING WORKSHEE
Page 201 and 202: Any future monitoring stations or s
Page 203 and 204: Project ManagerRepresentatives of a
Page 205 and 206: REFERENCESBiosystems Analysis, Inc.
Page 207 and 208: APPENDIX ASUMMARY OFPLANTSOBSERVED
Page 209 and 210: Species Family EnglishNameSamoanNam
Page 213: APPENDIX CSUMMARY OFAQUATIC MACROFA
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