american samoa - University of Hawaii at Manoa Botany Department

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Figure 6-2Vaipito Stream SegmentExisting ConditionsAmerican Samoa Wetland/Stream Restoration and Enhancement PlanFebruary 2001, Vaipito Stream, Page 6-3
Stream FlowsHistorical Stream FlowsIntermittent stream flow records have historically been collected by the U.S. Geological Surveyalong two tributaries of Vaipito Stream (Table 6-1). The data gained from these stream gagesprovide an insight of runoff volumes that historically have emptied into lower Vaipito Stream.TABLE 6-1MEDIAN STREAM FLOW ESTIMATESTRIBUTARIES OF VAIPITO STREAMStream USGSGageStationGage LocationVaima Stream 16949700 0.4 mile upstream fromVaipito Stream.Utumoa Stream 16949800 0.6 mile upstream ofVaipito Stream andimmediately upstream ofVaipito intake.Utumoa Stream 16950500 0.2 mile downstream ofUtumoa Stream pipeline.Source: Wong, 1996Stream FlowMeasurements(number)EstimatedMedian Flow (cfs)20 0.1629 0.4217 0.25Stormwater Discharges, Flood Potential, and ErosionPedersen Planning Consultants made a hydrologic analysis of potential stormwater dischargesinto inner Pago Pago Harbor via a range of potential storm events. Through hydrologicmodeling, PPC determined that potential stormwater discharges into inner Pago Pago Harborcould range from 862 cubic feet per second (cfs) for a 2-year storm and about 3,683 cfs for a100-year storm (Table 6-2). Consequently, significant stream flows can be carried by VaipitoStream for more common 2-year events, as well as less frequent 100-year storms.TABLE 6-2STORMWATER RUNOFF DISCHARGES INTO INNER PAGO PAGO HARBORFROM VAIPITO STREAM DRAINAGE2,10,50, AND 100-YEAR STORM EVENTSIN CUBIC FEET PER SECOND (CFS)Location 2-Year Storm 10-Year Storm 50-Year Storm 100-YearStormVaipito Stream 612 1,084 2,137 2,608Unnamed Stream 220 391 775 947Gagamoe Stream 30 53 104 128TOTAL 862 1,528 3,016 3,683Source: Pedersen Planning Consultants, 2000Ten, 50, and 100-year flood plains determined by the U.S. Army Corps of Engineers, HonoluluDistrict, in 1988 suggest that greater flood potential is generally downstream of the VaipitoAmerican Samoa Wetland/Stream Restoration and Enhancement PlanFebruary 2001, Vaipito Stream, Page 6-4
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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
Page 43 and 44: East Portion of the MarshThe impact
Page 45 and 46: WETLAND RESTORATION AND ENHANCEMENT
Page 47 and 48: The availability of new, blight-res
Page 49 and 50: Long-Term Monitoring and Site Maint
Page 51 and 52: TABLE 3-7FIELD MONITORING WORKSHEET
Page 53 and 54: Recommended monitoring stations or
Page 55 and 56: Figure 4-1Location MapAoa Village W
Page 57 and 58: No stream flow estimates are availa
Page 59 and 60: Fresh-Water SwampThe fresh-water sw
Page 61 and 62: ecome dominant if there is a nearby
Page 63 and 64: Relative Abundance and Diversity of
Page 65 and 66: Option 4: Restore Mangrove Forest U
Page 67 and 68: TABLE 4-5COMPARATIVE EVALUATIONWETL
Page 69 and 70: Long-term resource management activ
Page 73 and 74: • begin at the Tapua Stream mouth
Page 75 and 76: Figure 5-1Location MapSoutheast Wet
Page 77 and 78: Tufu Stream and two stream branches
Page 79 and 80: Mr. Whistler was part of a three-pe
Page 81 and 82: InvertebratesCrustacean densities w
Page 83 and 84: FIGURE 5-3OPTION 1: RESTORE RIPARIA
Page 85 and 86: TABLE 5-4COMPARATIVE EVALUATIONWETL
Page 87 and 88: Long term monitoring of the Vatia w
Page 91 and 92: More specific monitoring of stream
Page 93: Figure 6-1Location MapVaipito Strea
Page 97 and 98: California grass (Brachiaria mutica
Page 99 and 100: FIGURE 6-3FISH AND INVERTEBRATE SUR
Page 101 and 102: Most of lower Vaipito Stream segmen
Page 103 and 104: Red mangrove should be planted with
Page 105 and 106: TABLE 6-7PRELIMINARY COST ESTIMATEC
Page 107 and 108: TABLE 6-9LONG-TERM RESOURCE MONITOR
Page 109 and 110: TABLE 6-10 (Continued)FIELD MONITOR
Page 111 and 112: Vehicular and pedestrian access to
Page 113 and 114: Figure 7-1Location MapLeele-Papa-Ta
Page 115 and 116: Stream flow, in some cases, is cons
Page 117 and 118: Stormwater Discharges and Related F
Page 119 and 120: AQUATIC FISH AND INVERTEBRATESGener
Page 121 and 122: Opportunities and StrategiesOption
Page 123 and 124: Figure 7-3Option 2: Reduction of Er
Page 125 and 126: 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
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TABLE 8-8FIELD MONITORING WORKSHEET
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TABLE 8-8 (Continued)FIELD MONITORI
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LOCATIONChapter NineLEAFU STREAMLea
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Figure 9-2Leone Pala and 300-Foot L
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However, during and following heavi
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Vegetation TrendsThe lower Leafu St
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LAND USES ADJACENT TOLOWER LEAFU ST
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Option 2: Construct Basaltic Wall,
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Figure 9-5:Stabilize East Stream Ba
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TABLE 9-7PRELIMINARY COST ESTIMATEP
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TABLE 9-8LONG-TERM RESOURCE MONITOR
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TABLE 9-9 (Continued)FIELD MONITORI
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Chapter TenASILI STREAMLOCATIONAsil
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Figure 10-2Asili Stream SegmentExis
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Stormwater Discharges and Related F
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Further downstream, the stream chan
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TABLE 10-4SUMMARY OF MACROFAUNAL OR
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American Samoa Wetlands/Streams Res
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CLEAN-UP OF LOWER ASILI STREAMLABOR
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TABLE 10-9LONG-TERM RESOURCE MONITO
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TABLE 10-10 (Continued)FIELD MONITO
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Vehicular and pedestrian access to
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Figure 11-1Location MapFusi Wetland
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WETLAND VEGETATIONNovember 1999 Sur
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The lack of stream flow entering th
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Figure 11-3Option 1: Remove Solid W
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Recommended Option and Estimated Pr
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TABLE 11-6FIELD MONITORING WORKSHEE
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Any future monitoring stations or s
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Project ManagerRepresentatives of a
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REFERENCESBiosystems Analysis, Inc.
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APPENDIX ASUMMARY OFPLANTSOBSERVED
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Species Family EnglishNameSamoanNam
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APPENDIX CSUMMARY OFAQUATIC MACROFA
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american samoa - University of Hawaii at Manoa Botany Department

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