Impact of rainwater catchment systems on stormwater discharge in two neighborhoods in Potash Brook...
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Transcript of Impact of rainwater catchment systems on stormwater discharge in two neighborhoods in Potash Brook...
Impact of rainwater catchment Impact of rainwater catchment systems on stormwater discharge in systems on stormwater discharge in two neighborhoods in Potash Brook two neighborhoods in Potash Brook
watershedwatershed
MarySutton Carruthers
Kristen Hendrick
Emily Schelley
Kyle Velvis
Problem StatementProblem Statement
Currently there is no assessment of the potential for decreasing discharge rates in Butler Farm neighborhood or in the Airport neighborhood
An assessment could provide scientific justification for management decisions dealing with water quality
Background/JustificationBackground/Justification
High discharge rates are associated with increased erosion, sedimentation and pollutant loading into streams
Can cause changes in geomorphology and adversely affect benthic invertebrates
Types of Catchment SystemsTypes of Catchment Systems
Rain Barrels-Large container (50-80
gallons) placed at downspout to collect rooftop runoff
-Water is saved for use during dry periods
Types of Catchment Systems Types of Catchment Systems
Rain Gardens-Shallow landscaped
depression positioned to capture stormwater runoff
-planted with native, water tolerant plants
-reduction in fertilizer use
-additional habitat
Neighborhood A – Neighborhood A – AirportAirport
101 houses occupying ~36 acres of land
Soil hydrogroup A Adams and
Windsor loamy sand soil classes most prominent
Excessively drained rapid permeability
Soil class descriptions taken from USDA-NRCS
Neighborhood D – Neighborhood D – Butler FarmsButler Farms
248 houses sitting on ~135 acres
Soil hydrogroup D Vergennes clay and
Farmington silty loam most prominent soil classes
Moderate to slow permeability, moderately well drained
Soil class descriptions taken from USDA-NRCS
Model Inputs/AssumptionsModel Inputs/Assumptions
Altered drainage patternsDefault storm data used from NRCS Percent impervious based on CWP dataMitigation effort represents 8% reduction in
effective impervious areaLongest flow path determination
FindingsFindings
Neighborhood A Peak Flows
0.00
1.00
2.00
3.00
4.00
5.00
6.00
7.00
1 yr 5 yr 50 yr 1 yr 5 yr 50 yr
Current Mitigated
Event
Pe
ak F
low
(m
m/h
r)
FindingsFindingsNeghborhood D Peak Flows
0.00
10.00
20.00
30.00
40.00
50.00
60.00
70.00
80.00
1 yr 5 yr 50 yr 1 yr 5 yr 50 yr
Current Mitigated
Event
Pe
ak F
low
(m
m/h
r)
FindingsFindings
% reduction in peak flow
Neighborhood A 50 yr 58.3
Neighborhood D 1 yr 18.2
5 yr 13.1
50 yr 9.6
RecommendationsRecommendations
Airport neighborhood:
– Mitigation efforts useful…howeverCurrent situation does NOT show high flow
because of PERMEABLE soils
– No catchment systems recommended
RecommendationsRecommendations
Butler Farm
– Current situation shows high flows… howeverMitigation NOT useful because of
IMPERMEABLE soils
– Alternate catchment systems, such as detention ponds should be assessed