Site Location: main road north of Malingua Pamba
Map Number: 04
Date of Evaluation: 2 July 2011
Time: late morning
Site Priority: moderate
Explain priority: long-term (not immediate) problem
GPS Point Location:
Latitude: 49.335
Longitude: 52.065
UTM Northing:
UTM Easting:
GPS Point Location:
Latitude:
Longitude:
UTM Northing:
UTM Easting:
Elevation (M): 3257
Geomorphology: hillside
Slope (%):
Aspect:
Dimensions: <5m long
Soil: sand and road aggregate
Vegetation: some grass
Description: stormwater is creating gully along side of road and undercutting road surface
Cause: stormwater running unchecked along side of road
Treatment options: Check dam here would slow down storm water & protect road from
undercutting
Materials needed: for 2 check dams – cobbles 100x30x30cmx2 = 0.2m3 cobbles
Other:
Site Location: Quebrada Yanarumi main road crossing
Map Number: 09
Date of Evaluation: 2 July 2011
Time: late afternoon
Site Priority: high
Explain priority: stormwater erosion could make road impassible
and expensive to repair
GPS Point Location:
Latitude: 49.406
Longitude: 51.157
UTM Northing:
UTM Easting:
GPS Point Location:
Latitude:
Longitude:
UTM Northing:
UTM Easting:
Elevation (M): 3585
Geomorphology: deeply incised drainage eroding
headword into road surface
Slope (%):
Aspect: west
Dimensions:
Soil: sand and road aggregate
Vegetation: scattered shrubs and grasses
Description: slope failure and flow took out road recently; erosion may continue to cut into road
Cause: stormwater flow and unprotected road fill
Treatment options: Planting shrubs and grasses along outer lip of road and on slope below road
could protect road from erosion in all but major storm events. Riprap on slope below road could
also provide more stability.
Materials needed: shrubs – 25m row; riprap (1m boulders) – 20mx10m = 200m3
Other:
Site Location: road above (and to the north of) Quebrada Yanarumi
Map Number: 10
Date of Evaluation: 2 July 2011
Time: late afternoon
Site Priority: moderate
Explain priority: most slope failures could be pushed off road
surface with a dozer.
GPS Point Location:
Latitude: 49.479
Longitude: 51.353
UTM Northing:
UTM Easting:
GPS Point Location:
Latitude:
Longitude:
UTM Northing:
UTM Easting:
Elevation (M): 3544
Geomorphology: road cut across steep hillside
Slope (%): 50
Aspect: 300◦
Dimensions: about 10m long
Soil: organic topsoil & sandy subsoil
Vegetation: grasses
Description: Slope failure above road cut
Cause: over-steepened, unprotected soil exposed in road cut probably failed when saturated
Treatment options: plant grasses/shrubs on road cut to stabilize it; grade site first and create
furrows along the contour in preparation for planting.
Materials needed: grasses/shrubs - 10m x 3m = 30m2 area
Other:
Site Location: below Tanque Atugsara
Map Number: 13
Date of Evaluation: 3 July 2011
Time: 1420
Site Priority: high
Explain priority: integrity of water lines threatened by stormwater
flows and slope failures
GPS Point Location: photo
Latitude: 49.420
Longitude: 52.135
22 gully crossing
UTM Northing:
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GPS Point Location:
Latitude:
Longitude:
UTM Northing:
UTM Easting:
Elevation (M): 3168
Geomorphology: steep hillside in mostly unconsolidated
volcanic sand
Slope (%):
Aspect: west &
Dimensions:
northwest
Soil: volcanic sand
Vegetation: mostly bare with minor amount of grass
Description: Potable & irrigation lines suspended over gullies and exposed on bare slopes
Cause: Construction practices
Treatment options: Consider placing suspended lines inside sections of steel pipe. Bury exposed
lines, if possible, and plant grasses/shrubs above and below lines to provide protection from slope
movement.
Materials needed: for 3 suspended sections – 5m x 25cm steel pipe x 3 and 2m2 shrubs; for one
exposed section – 4m2 of shrubs & abono
Other:
Site Location: between Tanque Atugsara & Tanque Tingo
Map Number: 14
Date of Evaluation: 3 July 2011
Time: 1440
Site Priority: high
Explain priority: integrity of water lines threatened by stormwater
flows and slope failures
GPS Point Location: taken
Latitude: 49.552
Longitude: 52.169
at photo location
UTM Northing:
UTM Easting:
GPS Point Location:
Latitude:
Longitude:
UTM Northing:
UTM Easting:
Elevation (M): 3166
Geomorphology: incised gully in volcanic sand
Slope (%):
Aspect: northwest Dimensions:
Soil: volcanic sand
Vegetation: various grasses and shrubs
Description: Lines suspended over deep gully
Cause: construction practices
Treatment options: Consider placing suspended lines inside a section of steel pipe. Gully is too
deep for vegetation to protect suspended line.
Materials needed: 6m x 20cm steel pipe
Other:
Site Location: between Tanque Atugsara & Tanque Tingo
Map Number: 15
Date of Evaluation: 3 July 2011
Time: 1450
Site Priority: high
Explain priority: integrity of water lines threatened by slope failure
GPS Point Location:
Latitude: 49.585
Longitude: 52.205
UTM Northing:
UTM Easting:
GPS Point Location:
Latitude:
Longitude:
UTM Northing:
UTM Easting:
Elevation (M): 3124
Geomorphology: eroded cliff in volcanic sand
Slope (%):
Aspect: northwest Dimensions:
Soil: volcanic sand
Vegetation: bare with some grasses and shrubs above
and below
Description: Exposed lines along steep, unstable volcanic sand cliff.
Cause: Suspending lines across unstable cliff face.
Treatment options: Plant grasses and/or shrubs above and below suspended lines. Also consider
placing lines within a steel pipe section.
Materials needed: 3m3 sub-soil; 6m2x15cm =0.9m3 abono; 6m2 shrubs
Other:
Site Location: Tanque Tingo
Map Number: 16
Date of Evaluation: 3 July 2011
Time: mid-afternoon
Site Priority: high
Explain priority: Integrity of tank is threatened by erosion around
base. Portions of crop land are being lost to gullying. Integrity of
uspended irrigation line south of tank is threatened.
GPS Point Location: at tank Latitude: 49.659
Longitude: 52.220
UTM Northing:
UTM Easting:
GPS Point Location:
Latitude:
Longitude:
UTM Northing:
UTM Easting:
Elevation (M): 3123
Geomorphology: moderately steep hillside above river
Slope (%):
Aspect:
Dimensions:
Soil: volcanic sand with little or no
Vegetation: grasses and bare soil with a few shrubs
topsoil
Description: Minor erosion around base of tank. Some gullying below tank and south of tank.
Cause: Failure to revegetate areas disturbed by tank and line construction. Very poor soils that
are difficult to revegetate.
Treatment options: Repair tank base. Plant grasses and shrubs around tank and suspended line
south of tank. Place cobbles & gravel below tank overflow to stop further erosion. Consider using
abono or imported topsoil in revegetation areas to mitigate very poor sandy soil conditions.
Materials needed: 1) repair tank base: 50cmx50cmx20cm = 0.05m3 concrete
2) revegetate area around tank: 10m2 grass and abono
3) revegetate area around overflow pipe: 6m2 grass and abono
4) water spreader for overflow pipe: 6m x 5cm pipe (perforated), tee, and two end caps
5) suspended irrigation line south of Tanque Tingo: 20m2 row of shrubs planted below line and
abono
6) suspended irrigation line over gully: 10m x 10cm steel pipe; 5m row of shrubs and abono
7) stabilize gully: 50m x 1m shrubs = 50m2 shrubs planted along gully and abono
Other:
Site Location: along main road north of Tunguiche and below Chimbusi
Map Number: 18
Date of Evaluation: 3 July 2011
Time: mid-afternoon
Site Priority: high
Explain priority: massive slope failure in April 2011 closed road
GPS Point Location:
Latitude: 49.232
Longitude: 52.365
UTM Northing:
UTM Easting:
GPS Point Location:
Latitude:
Longitude:
UTM Northing:
UTM Easting:
Elevation (M): 3019
Geomorphology: road cut on steep hillside above river
Slope (%):
Aspect: southwest Dimensions:
Soil: volcanic sand
Vegetation: scattered shrubs
Description: unstable, sandy cut slope above road between Tunguiche and Chimbusi
Cause: Failure to revegetate unstable road cut
Treatment options: Plant grasses and/or shrubs on bare areas of slope to stabilize it. Consider
construction of a diversion ditch along top of scar diverting water to drainage to northwest and
putting a larger (or second) culvert under the road.
Materials needed: plant on scar - 30m x 30m shrubs &/or grasses = 900m2 plus abono;
diversion ditch – excavate trench 50m x 0.5m x 0.3m deep and plant shrubs in 50m row along
lower lip plus abono
Other:
Site Location: Road to Tunguiche above (east of) Chimbusi
Map Number: 20 & 47
Date of Evaluation: 3&6 Jul 2011 Time: late afternoon
Site Priority: high
Explain priority: stormwater erosion of slope below road threatens
to make it unusable without major repairs.
GPS Point Location: 20
Latitude: 49.141
Longitude: 52.252
(road above slope failure)
UTM Northing:
UTM Easting:
GPS Point Location: 47
Latitude: 49.102
Longitude: 52.272
(base of slope failure)
UTM Northing:
UTM Easting:
Elevation (M): 3037-3094
Geomorphology: steep gully and eroded slope in volcanic
sand.
Slope (%): 65
Aspect: north
Dimensions: 35m wide at top; 5m wide near bottom;
60m long
Soil: volcanic sand
Vegetation: mostly bare with scattered shrubs & grasses
Description: Huge erosion scar below road is unstable & will eventually erode road surface
rendering road unusable without building up road bed with boulders (major construction effort!)
Cause: destabilizing slope at angle of repose by constructing road across it
Treatment options: 1) Need to stabilize slope with grasses &/or shrubs. 2) Plant a row of shurbs
along outer lip of road. Amendments or topsoil needed. 3) Build up berm along lip of feature
before planting shrubs/grasses to keep water from flowing off road and on to slope. 4) erosion
control netting could be placed and anchored across slope following planting.
Materials needed: 1) 800m2 of grasses &/or shrubs planted on the bare slope below the road
(include a row of shrubs or grasses along outer edge of road);
2) +/-400m2 of erosion control netting on upper part of slope;
3) 25m x 10m = 250m2 of grasses on road cut above road;
4) 40m row of shrubs near edge of lip above road cut;
5) possible 40m diversion ditch a few meters back from edge of lip above road with drainage to a
new culvert under road;
6) improvements to ditch along inside of road including check dams where needed and drainage
to another new culvert under road.
7) abono as needed for plantings
Other: Sand bags currently used are only a temporary solution.
Site Location: Road to Tunguiche above (east of) Chimbusi
Map Number: 21
Date of Evaluation: 3 & 6 July
Time: mid-afternoon (both
2011
days)
Site Priority: moderate
Explain priority: slope failure could close road with a large amount
of debris
GPS Point Location: on road Latitude: 49.073
Longitude: 52.219
at base of feature
UTM Northing:
UTM Easting:
GPS Point Location:
Latitude:
Longitude:
UTM Northing:
UTM Easting:
Elevation (M): 3098
Geomorphology: road cut on steep hillside
Slope (%): 80Aspect: north
Dimensions: 22m along base of feature at road; about
110
30m high
Soil: volcanic sand
Vegetation: scattered grasses; mostly bare soil
Description: large, unstable slope failure from road cut
Cause: road constructed across slope which was at angle of repose
Treatment options: Consider removing excess material at bottom of slope and transporting it
down to Map #20 for use as fill. Grade remaining slope to more moderate angle and stabilize with
plantings.
Materials needed: backhoe and dump truck to move excess material; grasses and/or shrubs to
cover 600m2 of cut slope; abono as needed.
Other:
Site Location: road to Tunguiche above (east of) Chimbusi
Map Number: 22
Date of Evaluation: 3 & 6 July
Time: mid to late afternoon
2011
(both days)
Site Priority: moderate
Explain priority: Nearly bare, unstable road cut could collapse
closing road
GPS Point Location: base of Latitude: 48.864
Longitude: 52.203
slope
UTM Northing:
UTM Easting:
GPS Point Location:
Latitude:
Longitude:
UTM Northing:
UTM Easting:
Elevation (M): 3140 (corrected?)
Geomorphology: road cut across steep hillside
Slope (%): up to Aspect: north
Dimensions: extends 80m along road; height varies
120%
Soil: volcanic sand
Vegetation: mostly bare with scattered bushes
Description: unstable cut slope above road; bushes are stabiliazing slope below road.
Cause: road cut in slope which was at the angle of repose
Treatment options: Planting shrubs near base of slope would improve stability.
Materials needed: base of road cut – 2 rows of shrubs for 80m and abono as needed
Other: Road is fairly wide here so slides can be pushed out of the way in most spots and there is
some room for accumulation of soil at base of cut without blocking road.
Site Location: Pucara
Map Number: 27
Site Priority: medium
GPS Point Location:
beyond upper end of gully
GPS Point Location:
Date of Evaluation: 4 July 2011
Time: morning
Explain priority: Threat to agricultural land is long term
Latitude: 49.797
Longitude: 51.979
UTM Northing:
UTM Easting:
Latitude:
Longitude:
UTM Northing:
UTM Easting:
Elevation (M): 3292
Geomorphology: deeply dissected plateau/bench in
volcanic sand
Slope (%):
Aspect:
Dimensions:
Soil: volcanic sand
Vegetation: crops on top of benches and bottom of
gullies; some shrubs on gully sides but considerable bare
ground
Description: Large gullies expanding gradually into agricultural land
Cause: cultivation without adequate erosion controls over many (perhaps hundreds of) years
Treatment options: Plant shrubs and trees above upper lip of gullies to slow down gradual
migration of gullies into crop land.
Materials needed: general estimate of 2000m of shrubs planted along upper lips of eroded slopes
in Pucara
Other: There are a number of gullies in Pucara with this same problem.
Site Location: Quebrada Yanarumi east of Pucara
Map Number: 31
Date of Evaluation: 4 July 2011
Time: morning
Site Priority: low
Explain priority: maintaining long term stability of road across this
quebrada would be very expensive (perhaps a bridge with deep
pilings)
GPS Point Location: road
Latitude: 49.633
Longitude: 51.591
crossing
UTM Northing:
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GPS Point Location:
Latitude:
Longitude:
UTM Northing:
UTM Easting:
Elevation (M): 3282
Geomorphology: Steep, incised canyon (quebrada) with
perennial stream through mostly unconsolidated volcanic
sand. Bedrock layer (welded tuff) just above crossing
Slope (%):
Aspect: west
Dimensions:
Soil: volcanic sand
Vegetation: none
Description: washed out road & culvert across Q. Yanarumi was incapable of handling large flows.
Cause: 36” culvert was not large enough to handle peak flows and integrity of fill material was
inadequate to stand up against force of flood water.
Treatment options: Treatment not recommended because of expense necessary to maintain
long-term stability.
Other:
Site Location: east of Pucara
Map Number: 32
Date of Evaluation: 4 July 2011
Time: morning
Site Priority: low
Explain priority: Reconstructing and maintaining a road long term
across this very steep and unstable slope would be prohibitively
expensive given the resources available
GPS Point Location: south
Latitude: 49.626
Longitude: 51.596
side of slope failure
UTM Northing:
UTM Easting:
GPS Point Location:
Latitude:
Longitude:
UTM Northing:
UTM Easting:
Elevation (M): 3286
Geomorphology: large slope failure on very steep slope
in unconsolidated material below welded tuff ledge
Slope (%): 95-115 Aspect: 35◦
Dimensions:
Soil: volcanic sand
Vegetation: scattered grasses, mostly bare
Description: Large slope failure just northwest of Quebrada Yanarumi falls.
Cause: Road cut disturbed angle of repose of unstable volcanic sand; seeps near road cut
moistened soil increasing its propensity to flow
Treatment options: not recommended (see “explain priority” above)
Other:
Site Location: main road above (east of) Malingua Pamba
Map Number: 37
Date of Evaluation: 4 July 2011
Time: late afternoon
Site Priority: moderate
Explain priority: gully could expand and undermine portion of road
surface
GPS Point Location: at
Latitude: 48.972
Longitude: 51.574
switchback just north of
UTM Northing:
UTM Easting:
feature
GPS Point Location:
Latitude:
Longitude:
UTM Northing:
UTM Easting:
Elevation (M): 3417
Geomorphology: steep, vegetated hillside in mostly
unconsolidated volcanic sand.
Slope (%):
Aspect: west
Dimensions:
Soil: volcanic sand and aggregate
Vegetation: grasses on road cut above gully
road base
Description: Road is being undermined by a gully
Cause: stormwater flows along base of road cut
Treatment options: Slope breakers or cobbles in gully to slow down stormwater flow
Materials needed: 30m x 0.5m x 0.5m = 7.5m3 of cobbles
Other:
Site Location: Malingua Pamba primary school
Map Number: 39
Date of Evaluation: 5 July 2011
Time: early morning
Site Priority: moderate
Explain priority: gullies will eventually expand into school yard
reducing its utility for recreation
GPS Point Location:
Latitude: 49.421
Longitude: 51.906
UTM Northing:
UTM Easting:
GPS Point Location:
Latitude:
Longitude:
UTM Northing:
UTM Easting:
Elevation (M): 3297
Geomorphology: bench on moderate slope
Slope (%):
Aspect: north
Dimensions: 35m x 0.5-2.0m high.
Soil: volcanic sand
Vegetation: mixed grasses, shrubs, and bare ground
Description: Gullying developing next to primary school yard.
Cause: Protective layer of vegetation has been lost due to human activity
Treatment options: Suggest grasses/shrubs on face to stabilize area after filling in gullies with
cobbles and gravel and applying abono
Materials needed: 1m x 0.5m x 0.4m = 0.2m3 of cobbles; 35m x 1m = grasses and/or shrubs to
cover 35m2 of bare slopes plus abono as needed.
Other:
Site Location: Malingua Pamba, north of church along main road.
Map Number: 41
Date of Evaluation: 5 July 2011
Time: late afternoon
Site Priority: moderate
Explain priority: reducing erosion here would reduce downstream
sedimentation
GPS Point Location: along
Latitude: 49.356
Longitude: 51.921
road
UTM Northing:
UTM Easting:
GPS Point Location:
Latitude:
Longitude:
UTM Northing:
UTM Easting:
Elevation (M): 3302
Geomorphology: road cut on moderate slope
Slope (%):
Aspect: west
Dimensions:
Soil: volcanic sand with thin layer of
Vegetation: mixed grass and shrubs with bare areas
topsoil
Description: Eroded, unstable road cut .
Cause: human and animal traffic; nearly vertical, unvegetated road cut is inherently unstable
Treatment options: Suggest planting shrubs & grasses on cut face (except vertical cliff) to stabilize
it. Shrubs above eroded area would slow down stormwater flow in bare, eroded area.
Materials needed: shrubs and/or grasses to cover 100m x 2m = 200m2 above road & abono as
needed
Other:
Site Location: Malingua Pamba, east of tienda
Map Number: 42
Date of Evaluation: 5 July 2011
Time: late afternoon
Site Priority: low-moderate Explain priority: eroded area has been partially stabilized by shurbs
and newly planted trees
GPS Point Location: base of Latitude: 49.396
Longitude: 51.863
eroded slope
UTM Northing:
UTM Easting:
GPS Point Location:
Latitude:
Longitude:
UTM Northing:
UTM Easting:
Elevation (M): 3308
Geomorphology: moderately sloping hillside above road
Slope (%):
Aspect: west
Dimensions:
Soil: volcanic sand with some topsoil Vegetation: mixed grasses, shrubs, and bare area
Description: Erosion above road
Cause: road cut, human activity, and grazing animals
Treatment options: plant grasses/shrubs in bare area
Materials needed: grasses and/or shrubs to cover 3m x 2m = 6m2 and abono as needed
Other: Three small trees appear to have been planted in eroded area.
Site Location: Gully just north of Tanque Fiste
Map Number: 45
Date of Evaluation: 6 July 2011
Time: 0955
Site Priority: high
Explain priority: suspended water line could be ruptured by
stormwater; headword erosion will eventually cut through path.
GPS Point Location: where
Latitude: 49.281
Longitude: 52.047
water line crosses gully
UTM Northing:
UTM Easting:
GPS Point Location:
Latitude:
Longitude:
UTM Northing:
UTM Easting:
Elevation (M): 3239
Geomorphology: ephemeral gully above +/-7m drop-off
(dry water fall)
Slope (%): 20
Aspect: west
Dimensions: Exposed pipe section is 4.5 M wide.
Soil: volcanic sand with thin topsoil
Vegetation: grasses and shrubs with bare areas
Description: Water line is suspended 1m+ above gully - would be damaged during major flow
event.
Cause: Up-drainage agricultural activity and other human disturbance have increased intensity of
stormwater flows across highly erodible sandy soils.
Treatment options: Suggest planting about 3 shrubs above and 3 below line. Need amendments soil very sandy. Layer of cobbles just above existing shrub above water line crossing would slow
down flows past water line. Revegetate 10m long section of path to slow down headword erosion
of gully. Relocate path to south side of gully to avoid a crossing it, and rejoin existing path where
there is sigsig next to ravine (photo 4).
Materials needed: 1) pvc line across gully - 6m x 10cm steel pipe to run pipe through;
2) immediately above and below water line crossing - shrubs to cover 4m x 2m area = 8m2;
3) gully above water line - layer of cobbles 1m x 1m x 0.5m high = 0.5m3;
4) next to 7m drop-off - 10m x 1m =10m2 shrubs &/or grasses to reclaim path
Other: 20% slope from culvert to top of pour-off below trail crossing.
Site Location: Main road north of Malingua Pamba near Tanque Fiste
Map Number: 46
Date of Evaluation: 6 July 2011
Time: 1040
Site Priority: moderate
Explain priority: exposed water line but significant slope movement
not expected
GPS Point Location: base of Latitude: 49.258
Longitude: 52.041
slope along road
UTM Northing:
UTM Easting:
GPS Point Location:
Latitude:
Longitude:
UTM Northing:
UTM Easting:
Elevation (M): 3254 (3246 check)
Geomorphology: man-made road cut below moderately
sloping hill
Slope (%): 50
Aspect: W
Dimensions: 6M across slope X 3M down slope
Soil: volcanic sand w/minor topsoil
Vegetation: mostly bare, minor grasses
Description: 3m of exposed water line across mostly bare slope
Cause: road cut and foot travel across slope
Treatment options: Re-bury pipe w/15cm of topsoil or compost before planting with grasses and
shrubs.
Materials needed: grasses and/or shrubs to cover 6m x 3m = 18m2; 1m3 of abono to bury pipe
Other:
Site Location: Road to Tunguiche above (east of) Chimbusi
Map Number: 48
Date of Evaluation: 6 July 2011
Time: 1305
Site Priority: medium
Explain priority: headword gully erosion during stormwater events
will damage road surface
GPS Point Location: edge
Latitude: 49.102
Longitude: 52.235
of road above feature
UTM Northing:
UTM Easting:
GPS Point Location:
Latitude:
Longitude:
UTM Northing:
UTM Easting:
Elevation (M): 3081
Geomorphology:
Slope (%): 80
Aspect: northwest Dimensions: 2x2m area needs treatment at top of gully
Soil: gravelly volcanic sand
Vegetation: mostly volcanic sand with small number of
grasses
Description: Break in berm provides route for runoff from road surface. Gully developing below
road has potential to cut into road surface eventually.
Cause: road construction across steep slope originally at angle of repose
Treatment options: Anchor boulders, cobbles, jute netting, or sand bags on to slope. Plant
grasses/shrubs.
Materials needed: shrubs and/or grasses and jute netting to cover 2m x 2m =4m2; abono as
needed
Other:
Site Location: Road to Tunguiche above (east of) Chimbusi
Map Number: 49
Date of Evaluation: 6 July 2011
Time: 1400
Site Priority: high
Explain priority: bare slope below road is very unstable and will
erode headword creating gullies across road.
GPS Point Location: on road Latitude: 49.065
Longitude: 52.217
above culvert
UTM Northing:
UTM Easting:
GPS Point Location:
Latitude:
Longitude:
UTM Northing:
UTM Easting:
Elevation (M): 3095
Geomorphology: road cut across steep hillside and
quebrada
Slope (%): 80
Aspect:
Dimensions: 22m around outer edge of road x 5m down
northwest
to culvert
Soil: volcanic sand
Vegetation: mostly bare with a few grasses
Description: Eroded fill slope below road and around culvert which carries Quebrada Cuirumi flow
Cause: Road was constructed across a steep slope which was at angle of repose
Treatment options: 1) build up outer edge of road with soil; 2) plant bushes/grasses around lip for
stability; 3) plant upper 5m of slope down to culvert. 4) Consider use of erosion control fabric
after vegetation has been planted.
Materials needed: 1) along edge of road - 22m x 0.5m x 0.4m = 4.4m3 topsoil/abono and row of
shrubs and/or grasses 22m long; 2) slope below road – 22m x 5m = 110m2 of shrubs and/or
grasses and 110m2 jute netting.
Other:
Site Location: Road to Tunguiche above (east of) Chimbusi
Map Number: 50
Date of Evaluation: 6 July 2011
Time: 1425
Site Priority: moderate
Explain priority: water line suspended across slope could be
ruptured by stormwater or slope movement
GPS Point Location: at edge Latitude: 49.013
Longitude: 52.231
of road next to line
UTM Northing:
UTM Easting:
GPS Point Location:
Latitude:
Longitude:
UTM Northing:
UTM Easting:
Elevation (M): 3095
Geomorphology: road cut on steep slope
Slope (%): 90
Aspect: northwest Dimensions: Length of exposed line is 9.5m
Soil: volcanic sand with thin layer of
Vegetation: a few grasses on mostly bare slope
topsoil
Description: water line is draped over eroded road cut face
Cause: stormwater erosion of steep road cut
Treatment options: Line is draped over one new tree at present. Suggest 2 more trees/bushes on
either side to provide more stability to water line.
Materials needed: 2m2 trees/shrubs
Other:
Site Location: North of Malingua Pamba and east of main road
Map Number: 51
Date of Evaluation: 6 July 2011
Time: 1550
Site Priority: medium
Explain priority: cropland in very sandy soil which is highly
susceptible to erosion
GPS Point Location: about
Latitude: 49.068
Longitude: 51.840
200m west of field on road UTM Northing:
UTM Easting:
GPS Point Location:
Latitude:
Longitude:
UTM Northing:
UTM Easting:
Elevation (M): 3239
Geomorphology: moderate slope in sandy volcanic soil
Slope (%): 50+
Aspect: west
Dimensions:
Soil: volcanic sand
Vegetation: cropland – currently bare
Description: Eroded agricultural field in sandy soil.
Cause: lack of protective vegetation makes field very prone to erosion
Treatment options: Terracing with protective grasses/shrubs would help productivity and cut
down on erosion and sedimentation.
Materials needed: Determine if landowner has an interest in terrace agriculture before
calculating needs.
Other:
Site Location: Main road north of Malingua Pamba
Map Number: 053 & 054
Date of Evaluation: 6 July
Time: 1615
Site Priority: high
Explain priority: Headword erosion of gully threatens road
GPS Point Location: road
Latitude: 49.216
Longitude: 52.073
above gully
UTM Northing:
UTM Easting:
GPS Point Location: 40m
Latitude: 49.193
Longitude: 52.062
down gully from road
UTM Northing:
UTM Easting:
Elevation (M): 3238 - 3217
Geomorphology: Deep gully in slope below road.
Slope (%): 70
Aspect: NW
Dimensions: see sketch
(upper end)
Soil: gravelly sand
Vegetation: Scattered grasses and shrubs, mostly bare.
Description: Gully below road and sedimentation in field below
Cause: Runoff from road, headword erosion in volcanic sand
Treatment options: Plant shrubs, grasses along 5M length of berm next to road. Place cobbles at
upper end of gully to slow down water and reduce its erosive force. Construct check dams from
cobbles and boulders as shown on sketch. Selectively plant shrubs and grasses in bottom of gully.
Materials needed: 1) berm next to road – 5m long row of shrubs or grasses;
2) upper end of gully – 20m x 1m x 0.5m = 10m3 of cobbles
3) 4m2 x 0.5m = 2m3 cobbles for check dams
4) 20m x 1m = 20m2 of shrubs and/or grasses in lower end of gully
Other:
Site Location: Tanks 9 & 10 on potable line east of Tunguiche
Map Number: 59
Date of Evaluation: 7 July 2011
Time: 1400
Site Priority: moderate
Explain priority: bare areas around tanks susceptible to erosion
which will cause downslope sedimentation of agricultural land and
gullying
GPS Point Location:
Latitude: 49.417
Longitude: 52.147
Tank 10
UTM Northing:
UTM Easting:
GPS Point Location:
Latitude:
Longitude:
UTM Northing:
UTM Easting:
Elevation (M): 3192
Geomorphology: moderately steep slope on volcanic
sand
Slope (%):
Aspect: west
Dimensions: <10m2 at Tank 10; about 10m2 below Tank 9
Soil: volcanic sand
Vegetation: grass outside of bare areas surrounding
tanks
Description: Erosion, sedimentation, and unvegetated areas around tanks.
Cause: No revegetation after tank construction
Treatment options: Suggest planting grass (soil needs amending) above and below tanks
Materials needed: 10m2 x 10m2 = 20m2 grass around tanks 9 and 10
Other:
Site Location: Irrigation tank near Tank 10, east of Tunguiche
Map Number: 60 & 61
Date of Evaluation: 7 July 2011
Time: 1455
Site Priority: moderate
Explain priority: grass has come back in some eroded areas but
tank overflows can cause new erosion/sedimentation in the future
GPS Point Location:
Latitude: 49.406
Longitude: 52.123
irrigation tank
UTM Northing:
UTM Easting:
GPS Point Location:
Latitude: 49.392
Longitude: 52.141
outfall area
UTM Northing:
UTM Easting:
Elevation (M): 3181 - 3165
Geomorphology: small gullies on moderately steep
hillside on volcanic sand
Slope (%): 40%;
Aspect: west
Dimensions: diversion ditch – 36m long; outfall area –
15% in outfall
7x10m
area
Soil: volcanic sand
Vegetation: grass with a few bare areas
Description: erosion below tank may not be stopped by row of new trees planted in front of tank
Cause: overflows from irrigation tanks
Treatment options: Consider a diversion ditch leading to an outfall area 36m below.
Recommendations: 1) Plant grass in excavated ditch; 2) place cobbles and construct cobble check
dam(s) in steep stretches of ditch; 3) Plant a few shrubs in outfall area.
Alternative to above – Discharge water spreaders
Materials needed: 1) water spreader for overflow pipes: 6m x 2 = 12m x 5cm pipes (perforated),
2 tees, and four end caps; 2) 5m2 grasses and/or shrubs to revegetate bare areas and abono as
needed.
Other:
Site Location: East of Tunguiche, below Tank 10
Map Number: 62
Date of Evaluation: 7 July 2011
Time: 1545
Site Priority: moderate-high Explain priority: soil movement resulting from stormwater flow
could place stress on pipe and rupture it.
GPS Point Location:
Latitude: 49.395
Longitude: 52.158
UTM Northing:
UTM Easting:
GPS Point Location:
Latitude:
Longitude:
UTM Northing:
UTM Easting:
Elevation (M): 3146
Geomorphology: steep slope in volcanic sand
Slope (%): 60
Aspect: northwest Dimensions: 5x1m
Soil: volcanic sand with minimal
Vegetation: grasses on either side of eroded area
topsoil
Description: 5m section of exposed water line on slope
Cause: eroded by pedestrians and construction of pipeline without revegetation
Treatment options: plant grasses and shrubs along exposed line after covering with 15cm of
topsoil/abono; route path away from water line.
Materials needed: soil covering for water line - 5m x 0.8m x 15cm = 0.6m2; grasses and/or shrubs
to cover 5m2 area
Other:
Site Location: East of Tunguiche along water line
Map Number: 63
Date of Evaluation: 7 July 2011
Time: 1600
Site Priority: high
Explain priority: continued movement of soil on this unstable slope
threatens to rupture put pressure on water line and rupture it
GPS Point Location: where Latitude:49.366
Longitude: 52.175
water line crosses slope
UTM Northing:
UTM Easting:
GPS Point Location:
Latitude:
Longitude:
UTM Northing:
UTM Easting:
Elevation (M): 3128
Geomorphology: slope failure on steep slope in volcanic
sand
Slope (%): 75-90 Aspect: west
Dimensions: +/-65x15m above trail; +/-30x10m below
Soil: volcanic sand
Vegetation: grasses on either side of scar
Description: Large slope failure threatens to rupture water line which it crosses.
Cause: construction of water line and heavy use of path may have triggered failure.
Treatment options: plant grasses, shrubs, and/or trees to stabilize feature and protect water line.
Materials needed: 1) Rows of trees above and below water line to provide extra protection – 25m
rows of trees;
2) grasses and/or shrubs - (65m x 15m = 975m2) + (30m x 10m = 300m2) = 1275m2
3) abono as needed
Other: Need to more closely evaluate why slope presumably covered with thick grasses failed.
Site Location: Tunguiche, +/-150m above and east of church
Map Number: 65
Date of Evaluation: 7 July 2011
Time: 1655-1730
Site Priority: moderate-high Explain priority: water lines in gully are exposed and subject to
rupture; stormwater will continue to erode gully causing
sedimentation below
GPS Point Location:
Latitude: 49.459
Longitude: 52.279
irrigation tank
UTM Northing:
UTM Easting:
GPS Point Location:
Latitude: 49.472
Longitude: 52.281
lower end of gully
UTM Northing:
UTM Easting:
Elevation (M): 3058-3059 (approx.)
Geomorphology: moderate slope in very sandy soil
Slope (%): 20
Aspect: 190
Dimensions: see diagram
Soil: volcanic sand
Vegetation: scattered grasses on either side of gully
Description: Gully has developed below lowest of three blue irrigation tanks east of church.
Upper 14m of gully below tank is worst section.
Cause: tank overflow
Treatment options: 1) Fill gully with cobbles and sand; 2) place 15-30cm of topsoil/abono at
surface; 3) Plant grasses and shrubs to stabilize feature; 3) discharge water spreader.
Materials needed: 1) cobbles for upper gully – 14m x 3m x 1m = 42m3;
2) sand (top of cobbles and lower gully) – 28m x 2m x 0.5m = 28m3;
3) abono at surface – 28m x 2m x 0.5m = 28m3;
4) grasses/shrubs – 28m x 2m = 56m2;
5) discharge water spreader – outlet pipe and fittings, tee, 6m slotted pvc pipe with end caps.
Other: Relatively moderate slope should be easy to stabilize with new vegetation.
Site Location: North of Malingua Pamba just west of main road
Map Number: 69 & 70
Date of Evaluation: 8 July 2011
Time: 0940
Site Priority: moderate
Explain priority: badly eroded trail/road causes sedimentation in
valley below.
GPS Point Location:
Latitude: 49.221
Longitude: 52.086
at main road
UTM Northing:
UTM Easting:
GPS Point Location: lower
Latitude: 49.213
Longitude: 52.105
end of eroded section
UTM Northing:
UTM Easting:
Elevation (M): 3232-3224
Geomorphology: moderate slope in volcanic sand
Slope (%):25-35 Aspect: northwest Dimensions: 44m long; 11m wide at junction with main
road; 2.5m wide at lower end of eroded section of trail.
Soil: volcanic sand
Vegetation: trail is bare sand; grass on either side
Description: Badly eroded trail below main road which leads down to Tanque Escoban.
Stormwater runoff will carry sediment to fields below
Cause: Appears that someone started to construct a road along this route.
Treatment options: Suggest narrowing path by planting shrubs and grasses on either side.
Materials needed: grasses and/or shrubs - (30m x 7.5m = 225m2) + (14 x 3.5m = 49m2) = 274m2
and abono as needed.
Other:
Site Location: Tanque Escoban
Map Number: 71
Date of Evaluation: 8 July 2011
Time: 1015
Site Priority: moderate
Explain priority: erosion from bare ground around tank will cause
sedimentation of cropland below
GPS Point Location: next to Latitude: 49.185
Longitude: 52.151
tank
UTM Northing:
UTM Easting:
GPS Point Location:
Latitude:
Longitude:
UTM Northing:
UTM Easting:
Elevation (M): 3199
Geomorphology: moderately sloping hillside in volcanic
sand
Slope (%):
Aspect: northwest Dimensions: 8m2
Soil: volcanic sand with thin topsoil
Vegetation: mostly bare with a few grasses around tank
Description: Minor erosion around tank.
Cause: No revegetation after tank construction
Treatment options: Suggest planting shrubs & grasses around tank to slow down flow of water
from site.
Materials needed: shrubs and/or grasses – 8m2 and abono as needed
Other:
Site Location: Irrigation tank 60M west of Tanque Escoban
Map Number: 72
Date of Evaluation: 8 July 2011
Time: 1025
Site Priority: moderate
Explain priority:
(tank); high (exposed line)
GPS Point Location:
Latitude: 49.174
Longitude: 52.179
tank inlet
UTM Northing:
UTM Easting:
GPS Point Location:
Latitude:
Longitude:
UTM Northing:
UTM Easting:
Elevation (M): 3184
Geomorphology: bench dropping off to steep hillside
immediately below tank
Slope (%): 45
Aspect: SW (tank); Dimensions: 5m exposed section of pipe below tank.
(waterline)
NW (line)
Soil: volcanic sand
Vegetation: grasses; bare along exposed line
Description: Some erosion under tank base at southwest corner. Short eroded gully below tank.
Exposed pipe 10m below tank.
Cause: overflow from tank; pipeline route was not revegetated after line was constructed
Treatment options: Suggest filling eroded base with cement & planting a shrub immediately
below. Plant a few shrubs/grasses to stabilize banks for approximately 1st 10M below tank.
Spread topsoil/abono along exposed pipe and plant shrubs/grasses.
Materials needed: 1) repair tank base: 50cmx50cmx20cm = 0.05m3 concrete;
2) immediately below tank – 3m2 shrubs and/or grasses;
3) exposed section of pipe – 5m x 1m x 0.5m = 2.5m3 abono or topsoil over eroded area and 5m x
1m = 5m2 area of shrubs.
Other:
Site Location: Tanque Don Julio (Tank 5 - potable)
Map Number: 91
Date of Evaluation: 9 July 2011
Time: 1050
Site Priority: low-moderate Explain priority: minor erosion below tank
GPS Point Location: tank
Latitude: 49.409
Longitude: 51.522
UTM Northing:
UTM Easting:
GPS Point Location:
Latitude:
Longitude:
UTM Northing:
UTM Easting:
Elevation (M): 3457
Geomorphology: moderate hillside in volcanic sand
Slope (%): 50-75 Aspect: west
Dimensions: 10m x 1-2m; 20m x 1m
Soil: volcanic sand with some topsoil Vegetation: grasses and shrubs next to eroded areas
Description: Linear erosion extending northwest and southwest from tank.
Cause: pedestrian and livestock traffic
Treatment options: Plant shrubs here to protect slope and exposed 1-inch line.
Materials needed: shrubs and/or plants – (10m x 1.5m = 15m2) + (20m x 1m = 20m2) = 35m2 plus
abono as needed
Other:
Site Location: Tank 6 (potable)
Map Number: 93
Date of Evaluation: 9 July 2011
Time: 1250
Site Priority: moderate
Explain priority: tank overflow will erode cropland below
GPS Point Location:
Latitude: 49.414
Longitude: 51.632
next to tank
UTM Northing:
UTM Easting:
GPS Point Location:
Latitude:
Longitude:
UTM Northing:
UTM Easting:
Elevation (M): 3393
Geomorphology: moderate-steep hillside on volcanic soil
Slope (%):
Aspect: northwest Dimensions: 5m2 area
Soil: stony sandy loam over volcanic
Vegetation: grasses surround eroded areas
sand
Description: gullying is starting to develop below tank
Cause: tank overflow
Treatment options: More rocks/cobbles below tank to slow down overflow; alternatively install
discharge water spreader. Plant a few bushes and grasses in eroded area
Materials needed: discharge water spreader – 6m slotted pvc pipe and tee; shrubs and/or grasses
to cover 5m2 area.
Other:
Site Location: North of Malingua Pamba next to main road.
Map Number: 96 & 97
Date of Evaluation: 9 July 2011
Time: 1525-1545
Site Priority: moderate
Explain priority: further erosion of gully will under mind house and
cause sedimentation in down-drainage areas
GPS Point Location:
Latitude: 49.345
Longitude: 51.940
at culvert below road
UTM Northing:
UTM Easting:
GPS Point Location:
Latitude: 49.359
Longitude: 51.948
lower end of gully
UTM Northing:
UTM Easting:
Elevation (M): 3287
Geomorphology: incised gully in volcanic sand on
moderate slope
Slope (%): 10
Aspect: west
Dimensions: 35m long
Soil: volcanic sand
Vegetation: majority of gully sides and bottom are bare;
areas of grasses and shrubs
Description: Large gully on west side of road which threatens house
Cause: more erosive stormwater flows due to agriculture and other human uses upslope
Treatment options: 1) riprap (cobbles/boulders) from culvert outlet to just past house – 10m x 2m
area along bottom of channel; 2) shrubs along remainder of channel below house to combat
further deepening/widening/lengthening of gully
Materials needed: cobbles/boulders - 10m x 2m x 0.5m = 10m3; shrubs - 4m x 25m = 100m2 plus
abono as needed.
Other:
Site Location: Blue irrigation tank above (south of) Chimbusi
Map Number: 98
Date of Evaluation: 9 July 2011
Time: 1635
Site Priority: high
Explain priority: exposed water lines above tank on unstable slope
GPS Point Location: at tank Latitude: 49.169
Longitude: 52.230
UTM Northing:
UTM Easting:
GPS Point Location:
Latitude:
Longitude:
UTM Northing:
UTM Easting:
Elevation (M): 3134
Geomorphology: steep hillside in volcanic sand
Slope (%): 90
Aspect: northwest Dimensions: 5m x 3m (eroded area above tank)
Soil: volcanic sand
Vegetation: grasses surrounding bare areas
Description: Eroded slopes above and below tank
Cause: no revegetation after construction of tank platform and water lines.
Treatment options: Plant shrubs in this area to protect pipes and slope. Abono or topsoil will
need to be added.
Materials needed: shrubs to cover 5m x 3m = 15m2 area; abono as needed
Other:
Site Location: South of Chimbusi and below blue irrigation tank
Map Number: 99
Date of Evaluation: 9 July 2011
Time: 1655
Site Priority: high
Explain priority: potable & irrigation lines are exposed/suspended
on steep hillside and could rupture as a result of stormwater or
slope movements
GPS Point Location:
Latitude: 49.162
Longitude: 52.238
lower end of exposed lines
UTM Northing:
UTM Easting:
GPS Point Location:
Latitude:
Longitude:
UTM Northing:
UTM Easting:
Elevation (M): 3107
Geomorphology: steep hillside in volcanic sand
Slope (%): 90
Aspect: north
Dimensions: 15-20m (lengths of exposed pipes); 3m wide
Soil: volcanic sand
Vegetation: bare soil and grasses/shrubs
Description: Irrigation and potable lines exposed on steep slope below blue irrigation tank
Cause: Lines were suspended rather than buried and slope was not revegetated after
construction.
Treatment options: Plant shrubs to protect slope and pipelines.
Materials needed: shrubs to cover 20m x 3m = 60m2 area and abono as needed
Other:
Site Location: Chimbusi tanks
Map Number: 100
Date of Evaluation: 9 July 2011
Time: 1725
Site Priority: moderate
Explain priority: erosion (including gullying) below tanks causes
sedimentation of farm land below
GPS Point Location:
Latitude: 49.133
Longitude: 52.367
Adjacent to tanks
UTM Northing:
UTM Easting:
GPS Point Location:
Latitude:
Longitude:
UTM Northing:
UTM Easting:
Elevation (M): 3103
Geomorphology: top of knoll underlain by volcanic sand
Slope (%):
Aspect:
Dimensions: 12m2 need treatment
Soil: volcanic sand with some topsoil Vegetation: shrubs and grasses around bare areas
Description: Potable and irrigation tanks in Chimbusi are located on a little knoll.
Gullied slope and exposed pipe on west side of tanks. Erosion below east side of tanks.
Cause: Overflow from tanks has caused gullies
Treatment options: Plant shrubs in overflow areas.
Materials needed: Shrubs to cover 12m2 area and abono as needed
Other:
Site Location: Tanque Bodega, north of Chimbusi
Map Number: 101
Date of Evaluation: 9 July 2011
Time: 1745
Site Priority: moderate
Explain priority: overflow from tank is eroding cropland to east
GPS Point Location:
Latitude: 49.030
Longitude: 52.428
at tank
UTM Northing:
UTM Easting:
GPS Point Location:
Latitude:
Longitude:
UTM Northing:
UTM Easting:
Elevation (M): 3109
Geomorphology: top of knoll underlain by volcanic sand
Slope (%):
Aspect:
Dimensions: 10m x 2m (erosion below water line west of
tank); 2m2 of cobbles below outlet
Soil: volcanic sand with some topsoil Vegetation: grasses with some bare ground
Description: Tank drain (bottom right of photo) appears to be causing erosion in field east of tank.
Erosion along water line west of tank
Cause: line west of tank was not revegetated after construction; not soil protection at outflow
area east of tank
Treatment options: 1) Place cobbles in a 2 meter square area below outlet to slow down and
disperse flow; 2) consider using a "level spreader" (slotted pipe capped at either end which is
joined as a "T" to the end of the outlet pipe) to spread out flow from outlet. 3) Plant grasses and
shrubs in eroded area west of tank.
Materials needed: water spreader for overflow pipe - 6m x 5cm pipe (perforated), tee, and two
end caps; grasses and/or shrubs to cover 10m x 2m = 20m2 area and abono as needed.
Other:
Site Location: south side of Quebrada Yanarumi, 100m+ east of Tanque Florian
Map Number: 201
Date of Evaluation: 2 July 2011
Time: afternoon
Site Priority: high
Explain priority: large slope failure has damaged crop and grazing
land and increased downstream sedimentation. Water line to
Pucara was ruptured by slope failure which could happen again.
GPS Point Location: none
Latitude:
Longitude:
UTM Northing:
UTM Easting:
GPS Point Location:
Latitude:
Longitude:
UTM Northing:
UTM Easting:
Elevation (M): +/- 3200-3250m
Geomorphology: steep mountainside in volcanic sand
Slope (%): +/-75 Aspect: northwest Dimensions: 100m+ long; 20m wide - estimated
Soil: appears to be volcanic sand
Vegetation: bare due to slope failure; surrounding area
includes grasses, shrubs, and crops
Description: Large slope failure on steep mountainside stripped vegetative cover
Cause: Appears that stormwater flow in swale and saturated soils combined to cause failure of
surficial material which is at angle of repose that developed prior to human disturbance (stripping
native vegetation for cultivation and grazing)
Treatment options: Terracing cropland above feature could help prevent its expansion. Planting
trees, shurbs, and grasses on feature could help stabilize it.
Materials needed: trees, shrubs, and/or grasses to cover 100m x 20m = 2000m2 area including
above top of feature; abono as needed
Other: Feature was not inspected/surveyed directly. It was viewed from road north of Quebrada
Yanarumi.
Site Location: road south of Chimbusi
Map Number: 202
Date of Evaluation: 3 July 2011
Time: afternoon
Site Priority: moderate
Explain priority: erosion/sedimentation has destroyed are
relatively large area of agricultural land and is increasing
downstream sedimentation
GPS Point Location: none
Latitude:
Longitude:
UTM Northing:
UTM Easting:
GPS Point Location:
Latitude:
Longitude:
UTM Northing:
UTM Easting:
Elevation (M): +/-3150m
Geomorphology: steep hillside in volcanic sand
Slope (%): 50%+ Aspect: southwest Dimensions: 100m x 50m - estimated
Soil: volcanic sand
Vegetation: mostly bare soil with scattered shrubs and
grasses
Description: Failure of top of slope appears to be continuously adding more sediment lower on
slope covering vegetation.
Cause: Construction of road cut and fill above feature without adequate erosion/sediment
controls.
Treatment options: Build up and vegetate outer lip of road above feature to reduce stormwater
flow down slope. Plant grasses and shrubs on hillside or terrace it for cultivation. Improve
drainage from road to divert it from these slopes
Materials needed: shrubs and/or grasses to cover 100m x 50m = 5000m2 and abono as needed
Other: Feature was not inspected/measured. It was viewed from the section of road between
Tunguiche and Chimbusi to the west.
Site Location: east of Chimbusi
Map Number: 203
Date of Evaluation: 3 July 2011
Time: afternoon
Site Priority: moderate
Explain priority: large erosion/sedimentation feature threatens
cropland on mesa top through headword erosion and is causing
downstream sedimentation.
GPS Point Location: none
Latitude:
Longitude:
UTM Northing:
UTM Easting:
GPS Point Location:
Latitude:
Longitude:
UTM Northing:
UTM Easting:
Elevation (M): +/-3025-3075m
Geomorphology: Steep hillside in volcanic sand below
mesa
Slope (%):
Aspect: northeast Dimensions: +/-100m long x 20-50m wide
+/-50-100
Soil: volcanic sand with no topsoil
Vegetation: Almost bare with shrubs and trees on either
side; lower slope is cultivated.
Description: large slope failure on side of mesa
Cause: probably stormwater flow from mesa overcame ability of vegetation to hold sandy soil
Treatment options: Plant trees and other vegetation along upper lip of feature to slow down
further erosion into cropland on mesa.
Materials needed: row of shrubs and/or trees 50m long above top of lip
Other: Site was not visited/inspected. It was viewed from road east of Chimbusi.
Site Location: road east of Chimbusi
Map Number: 204
Date of Evaluation: 3 July 2011
Time: afternoon
Site Priority: moderate
Explain priority: unstable road cut in volcanic sand could collapse
blocking road
GPS Point Location: none;
Latitude:
Longitude:
between 21 & 22
UTM Northing:
UTM Easting:
GPS Point Location:
Latitude:
Longitude:
UTM Northing:
UTM Easting:
Elevation (M):
Geomorphology: hilltop underlain by volcanic sand
Slope (%): 75+
Aspect: north
Dimensions: estimated at 50m long x 20m high
Soil: volcanic sand
Vegetation: none; grass above road cut
Description: Unstable road cut in volcanic sand
Cause: construction of road on steep side slope with no erosion/sediment controls or
revegetation on slope
Treatment options: try planting grasses on cut slope that will grow without topsoil; drainage
improvements along base of slope next to road may also help situation.
Materials needed: grasses to cover 50m x 20m = 1000m2 area
Other:
Site Location: hillside east of Pucara
Map Number: 205
Date of Evaluation: 4 July 2011
Time: morning
Site Priority: moderate
Explain priority: excavated soil has covered agricultural land and
will cause downslope sedimentation when stormwater flows down
slope.
GPS Point Location: none
Latitude:
Longitude:
UTM Northing:
UTM Easting:
GPS Point Location:
Latitude:
Longitude:
UTM Northing:
UTM Easting:
Elevation (M): +/-3350
Geomorphology: steep hillside in volcanic sand
Slope (%): +/-50 Aspect: north
Dimensions: +/-30x20m
Soil: volcanic sand w/some topsoil
Vegetation: some shrubs in mostly bare area
Description: excavated soil to create a bench for building construction has been pushed down
hillside below
Cause: construction practices
Treatment options: vegetate with crops, grasses, or shrubs; or construct agricultural terraces
Materials needed: discuss treatment options with landowner
Other: site not visited; observed from across valley
Site Location: Chilcaucu
Map Number: 206
Site Priority: moderate
Date of Evaluation: 7 July 2011
Time: morning
Explain priority: headword erosion will threaten house and
agricultural land.
GPS Point Location: none
Latitude:
Longitude:
UTM Northing:
UTM Easting:
GPS Point Location:
Latitude:
Longitude:
UTM Northing:
UTM Easting:
Elevation (M): +/-3400
Geomorphology: gully and hillside in volcanic sand
Slope (%): 75+
Aspect: northwest Dimensions: 50x10m & 15x15m - estimates
Soil: volcanic sand w/little topsoil
Vegetation: eroded areas are bare and surrounded by
shrubs and grasses
Description: Slope failure and eroded gully
Cause: human activity including cultivation and path along edge of slope
Treatment options: Plant trees, shrubs, and/or grasses especially at top of features.
Materials needed: rows of trees, shrubs, and/or grasses to cover 50m of gully lips
Other: sites were not visited but were observed from across the valley