american samoa - University of Hawaii at Manoa Botany Department

Long term monitoring of the Papa Stream restoration and enhancement project will requireperiodic examinations of, at least, the following:• the presence of stream flow;• potential impedances to stream discharge;• evidence of eroding stream bank areas;• potential failures or damages to gabion baskets or rock walls along the stream bank;• survival of planted, riparian trees;• potential flood damages to commercial and public facility properties;• changes in land uses immediately adjacent to the stream banks;• point-source discharges, e.g., storm water; and,• changes in the type and number of fish and invertebrates near station 1+00.The types of information needed, monitoring frequency, monitoring locations, and evaluationparameters are summarized in Table 7-9. A field work sheet or checklist, which can be used inthe field, is provided in Table 7-10.Future resource monitoring can be effectively performed through bi-annual site visits to lowerPapa Stream. This approach will enable comparisons during wet (December through March)and dry (April through November) seasons of the year. Additional visits should also take placeduring and/or following significant stormwater events that may be generated from periods ofsignificant rainfall.The availability of the American Samoa geographical information system enables theincorporation of most all resource monitoring information within the GIS. Field data can besummarized in attribute tables or databases. Digital photos can be linked to digital maps of therestoration site.Vehicular and pedestrian access to selected monitoring stations is largely dependent upon thecooperation and authorization of local residents and the Nuuuli Village Council. Assumingthat residents cooperatively permit periodic access for long-term resource monitoring, fieldmonitoring should begin at the station 1+00 and extend 1,180 feet upstream. Futuremeasurements of changes in the stream channel trapezoid will require the continued use of thesame stream cross section stations used for the present study.Recommended monitoring stations or sites should be used consistently unless unanticipatedevents, new land uses, or access issues prevent continued use. When necessary, changes in thelocation of monitoring stations should be documented and spatially located within theAmerican Samoa GIS. PPC has provided digital files for the Wetland and Stream Restorationand Enhancement Plan that provide a departure point for locating future resource monitoringstations along lower Papa Stream.All photographs should be incorporated into the digital photo album developed by PPC inconjunction with the Wetland/Stream Restoration and Enhancement Plan. This will enable along-term comparison of resource information.American Samoa Wetland/Stream Restoration and Enhancement PlanFebruary 2001, Papa Stream, Page 7-15