Key to Pacific Watershed Associates Erosion Inventory Database
| Field | Description |
| Site | Numerical format (i.e. 200 or 200.1) |
| GPS coord | |
| Watershed | What is the major watershed name? Enter as PWA(watershed name).( i.e. PWABEARCK) Do not use any spaces. |
| CALWAA | What is the California watershed ident. name? Select name from list in form. Refer to CALWAA map if necessary. |
| Photo | What is the flight line & number of the air photo that the site is located on? |
| Road | What is the township/range/section that the site is located in? |
| Mileage | What is the mileage in feet from the beginning of the road that the site is located at? Format = 1000 |
| Inspector | Who are the inspectors investigating the site? Format = EW,JF |
| Date | What is the date that the site was inventoried? Format = 6/26/98 |
| Year Built | What year does the road first show up on air photos? Refer to road history map. |
| Surface | Is the road surface rocked, native materials, or paved? |
| Sketch? | Was a sketch drawn to describe the site? |
| Road class | Basically the same question as Surface above. This is for the P.L. database & should be one of the following rocked, dirt, paved. |
| Treat? | Is the site going to be treated? Answered Yes/No. |
| Maintained? | Is the road maintained? Answered Yes/No.Are there waterbars, road surfacing that suggest occasional maintenance? Answered Yes/No. |
| Abandoned? | Is the road abandoned? Answered Yes/No. Is the road overgrown with brush &/or trees, crossings failed? Is it obvious that no vehicles or equipment have been on road for a long time? |
| Decomissioned? | Is the road decomissioned? Answered Yes/No. Is there evidence that the road has been treated for temporary or permanent closure. Have crossings been pulled, fills excavated, does road have cross road drains or water bars? |
| Driveable? | Is the road driveable? Answered Yes/No. This is answered yes if road can be driven, even if trees have blown down across road. Answered No if road is so gullied or deeply drained (i.e. cross road drains or large water bars) that a vehicle cannot drive on |
| Problem | Choose the appropriate problem that defines the site. |
| Location of problem | In what part of the watershed is the problem located? Choose from list. Location is defined with respect to distance from 2nd or 3rd order channels. (Not class 2 or 3, this refers to stream order). |
| Average road width | What is the average road width in feet? |
| Road related? | Is the problem caused by road building through the feature? If the problem is located outside the influence of the road i.e. some stream side landslides, bank erosion, some deep seated failures. |
| Harvest history | What is the age of the most recent cutting. CC = cable clearcut; TC= tractor clearcut; PT/PC partial tractor or cable cut; ASG advanced second growth; NO = no management activity. >15 or < 15 years old. |
| Geomorphic association | Is the problem located in the inner gorge (IG), stream side(SS), headwall swale (HD), Break in slope (BIS), swale (SW), Other - refers to any other location than previuosly described. |
| road fill failure? | If the site is a landslide, is it a road fill failure? Answered Yes/No. There may be combinations of slide types (i.e. road fill/ hillslope debris slides). |
| landing fill failure? | If the site is a landslide, is it a landing fill failure? Answered Yes/No. There may be combinations of slide types (i.e. landing fill/ hillslope debris slides). |
| cutbank slide? | If the site is a landslide, is it a cutbank failure? Answered Yes/No. There may be combinations of slide types (i.e.cutbank/ deep slow slides). |
| deep slow landslide? | If the site is a landslide, is it a deep slow failure? Answered Yes/No.This refers to deep slow moving slides like earthflows. There may be combinations of slide types (i.e.cutbank/ deep slow slides). |
| hillslope debris slide? | If the site is a landslide, is it a hillslope debris slide? Answered Yes/No.This refers to shallow or deep fast moving slides. There may be combinations of slide types (i.e.cutbank/ hillslope debris slide). |
| streamside slide? | If the site is a landslide, is it a stream side slide? Answered Yes/No.This refers to lanslides that occur within the inner gorge or last slope break leading to a stream. There may be combinations of slide types (i.e.road fill/streamside slide). |
| Did slide torrent? | If the site is a landslide, did the slide develop into a torrent? Answered Yes/No. |
| Slope shape | What is the shape of the hillslope that the failure was or will be initiated on? Choose one type from list. |
| Slope % | What is the slope gradient of the hillslope below the fill prism that the feature is located at? If the failure has failed all the way to the stream or fill toes into stream, use gradient down slide surface or fill. |
| distance to stream (ft) | For potential failures, what is the distance in feet from the base of the potential failure to the stream? For past failures, what is the distance in feet from the base of scour or erosion to the stream? |
| already failed? | Has the landslide failed in the past? Answered Yes/No. |
| potential failure? | Does the landslide have the potential to fail in the future? Answered Yes/No. |
| Culvert | If the site is a stream or ditch relief culvert, Is there a culvert present? If the site is a stream, |
| Bridge | If the site is a stream, is the current crossing structure a bridge? Answered Yes/No. |
| Humboldt | If the site is a stream, is the current crossing structure a humboldt? Answered Yes/No. |
| Fill | If the site is a stream, is the current crossing a fill crossing where the channel has been filled & flow is over the road fill or diverted down the road? Answered Yes/No. |
| Ford | If the site is a stream, is the current crossing structure a ford? Fords cross the stream in natural channel & are constructed with little or no fill. Answered Yes/No. |
| Armored fill | If the site is a stream, is the current crossing structure an armored fill? Armored fills have flow over road surface though deep rocked dip with rock or cement sill at outboard side of fill. Answered Yes/No. |
| Washed out | If the site is a stream, is the current crossing washed out? This refers to crossings which have more than 75% of fill gone & no crossing structure remains. Answered Yes/No. |
| Pulled crossing | If the site is a stream, has there been any attempt by the landowner to pull the crossing by removing crossing structure & laying back sidebanks. Answered Yes/No. |
| % Pulled | What is the percentage (%) of the crossing fill that has been pulled or removed? |
| Left ditch/road length (ft) | This should be answered for any problem type (not just stream crossings) where applicable. What is the length in feet of road or ditch from the left approach that is contributing to site. |
| Right ditch/road length (ft) | This should be answered for any problem type (not just stream crossings) where applicable. What is the length in feet of road or ditch from theright approach that is contributing to site. |
| Pipe diameter (in) | If the site is a stream or ditch relief culvert,what is the pipe diameter? Choose diameter from list. Do not enter any other diameter. Answered Yes/No. |
| Inlet | If the site is a stream or ditch relief culvert, what is the condition of the culvert inlet? |
| Outlet | If the site is a stream or ditch relief culvert, what is the condition of the culvert outlet? |
| Bottom | If the site is a stream or ditch relief culvert, what is the condition of the culvert bottom? |
| Headwall height (in) | If the site is a stream, what is the height of the fill from the base of the pipe to the top of the fill or point where flow would exit the inboard side of the crossing. |
| Cmp slope% | If the site is a stream, what is the culvert slope gradient (%)? |
| Stream class | If the site is a stream, is the stream a class 1, 2 or 3? Class 1 = fish bearing, class 2 supports aquatic life year round (i.e. pool habitat that supports aquatic life), class 3 runs intermittently or ephemerally & does not support an aquatic habitat. |
| Rustline at inlet (in) | If the site is a stream, what is the height in inches of the rustline inside the culvert inlet? |
| CMP appears undersized? | If the site is a stream, does the stream appear to be undersized for a 50yr flow? Answered Yes/No/Maybe. |
| % washed out | If the site is a stream, what is the percentage (%) of fill that has failed in the past? |
| Diversion Potential? | If the site is a stream, if the crossing failed would the flow divert down road out of its natural drainage area? Answered Yes/No. |
| Currently diverted? | If the site is a stream, is the stream currently diverted out of its natural drainage or does it divert during winter high flows? Answered Yes/No. |
| Diverted in past ? | If the site is a stream, is there evidence that the stream has diverted out of its natural drainage area in the past? |
| Road Grade% | If the site is a stream, what is the road grade (%) in the direction of the diversion potential? |
| Culvert plug potential | If the site is a stream, what is the potential for culvert to plug with sediment or debris? Choose answer from list. Format = H,HM,M,ML,L. |
| Channel grade% | If the site is a stream, what is the natural channel gradient outside the influence of the road leading to the crossing? |
| Channel width (ft) | If the site is a stream, what is the channel width in feet for 50 yr flow? Not the active channel width. |
| Channel depth (ft) | If the site is a stream, what is the channel depth in feet for 50 yr flow? Not the active channel depth. |
| Sediment Transport | If the site is a stream, what is the ability for the stream to transport sediment? Choose answer from list. Format = H,HM,M,ML,L. |
| Drainage Area | If the site is a stream, what is the drainage area above the crossing? This is not answered in the field inventory. This is determined in the office when calculating culvert sizes. |
| Now | If the site is a class 1 stream & a culvert is present, what is the drop distance in feet from the outlet to the plunge pool below at present time? |
| Bankful | If the site is a class 1 stream & a culvert is present, what is the drop distance in feet from the outlet to the plunge pool below when stream is bankful? |
| Now width | If the site is a class 1 stream & a culvert is present, what is the width in feet of the plunge pool below the culvert outlet in feet at the present time? |
| Now depth | If the site is a class 1 stream & a culvert is present, what is the depth in feet of the plunge pool below the culvert outlet in feet at the present time? |
| BF width | If the site is a class 1 stream & a culvert is present, what is the width in feet of the plunge pool below the culvert outlet in feet when the stream is bankful? |
| BF depth | If the site is a class 1 stream & a culvert is present, what is the depth in feet of the plunge pool below the culvert outlet in feet when the stream is bankful? |
| 50 Yr Q (cfs) | If the site is a stream, what is the discharge during the 50yr flow for the stream leading to this crossing? This is not answered in the field inventory. This is determined in the office when calculating culvert sizes. |
| 100 Yr Q (cfs) | If the site is a stream, what is the discharge during the 100yr flow for the stream leading to this crossing? This is not answered in the field inventory. This is determined in the office when calculating culvert sizes. |
| Erosion Potential | What is the potential for the site to fail in the future. This prioritizes sites according to erosion potential. Choose answer from list. Format = H,HM,M,ML,L. |
| Potential for extreme erosion? | Is there a potential for the site to fail in the future causing more erosion than calculated for in the field for "Future Erosion". Answered Yes/No. |
| Volume of extreme erosion (yds3) | If there is potential for extreme erosion, what is the volume of extreme erosion in yds3? Choose volume range from list. Do not enter a calculated volume, use the ranges given. |
| Age of past erosion (decade) | If there has been past erosion, what decade did the erosion occur in? For example if erosion occurred in '64 you would be enter 1960. If the erosion occurred in 1960 & 1970 enter 1960,1970. If the erosion is ongoing from 1960 enter 1960,1990. |
| Road surface, ditch, fillslope fluvial erosion | If there has been past erosion, what volume in yds3 is from road surface, ditch, fillslope fluvial erosion? |
| Gullied fillslope | If there has been past erosion, what volume in yds3 is from gullied fillslope/hillslope? |
| Fill failure | If there has been past erosion, what volume in yds3 is from fill failure? |
| Cutbank failure | If there has been past erosion, what volume in yds3 is from cutbank failure? |
| Hillslope failure | If there has been past erosion, what volume in yds3 is from hillslope failure? |
| Streambank and channel erosion | If there has been past erosion, what volume in yds3 is from hillslope failure? |
| Stream crossing failure | If there has been past erosion, what volume in yds3 is fromcrossing failure? This pertains to the crossing fill between the TOP & BOT & between the left & right hingelines. |
| Total Past Erosion (yds) | What is the total volume in yds3 of past erosion? This is the total volume of material that has failed. Determine by adding up the different volumes of past erosion. |
| Past delivery% | What is the past delivery (%) of the past erosion? This is the percentage (%) of failed material that has delivered to stream. Determine by averaging delivery percents for all past erosion types. |
| Total Past Yield (yds3) | What is the past yield of past erosion? This is the volume of material that has delivered to the stream. Determine by multiplying total past erosion by past delivery percent |
| Future Erosion (yds3) | What is the total volume in yds3 of future erosion? This is the total volume of material that could fail in future. Determined from field estimation. |
| Future delivery% | What is the future delivery (%) of the future erosion? This is the percentage (%) of future failed material that could deliver to stream. Determine by averaging delivery percents for all future erosion. |
| Future width (ft) | What is the average width (ft) of the feature that may fail? Width is along road alignment for landslides. Width is between right & left bank &/or hingelines for stream crossings & gullies. |
| Future depth (ft) | What is the average depth (ft) of the feature that may fail? |
| Future length (ft) | What is the average length (ft) of the feature that may fail? Length is upslope/downslope for landslides & gullies, and upstream/downstream for streams. |
| Future Yield (yds3) | What is the future yield of future erosion? This is the volume of material that could deliver to the stream. Determine by multiplying total future erosion byfuture delivery percent |
| Comment on Problem | This is a brief description of site that elaborates on information collected on dataform. This should describe unique features that identify the site in the field. |