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Wai‘ula‘ula Watershed Plan
• Background • Watershed condition• Status of plan
Wai‘ula‘ula watershed
headwaters
Intermittent flow in middle and lower reaches
groundwater seep
Current and future land use
Background on watershed plan ....
• focus on nonpoint pollutants • prerequisite for EPA funding of BMPs• MKSWCD lead agency• Carolyn Stewart
lead writer
Phase 1 of Watershed Management plan
• Describe watershed and threats to water quality
• stream water quality monitored with autosamplers and urban grab samples
• Potential BMPs identified
identified impairments• Waikoloa Stream below Waimea Town
– TN and TP • Wai‘ula‘ula stream just above ocean
– TN• adjacent Pelekane stream
– TSS, TN, TP 2 orders of magnitude above standard• nearshore marine waters
– ammonia and algae
Of concern but not measured– pools in intermittent sections of stream– losses due to streambed infiltration
Potential sediment and nutrient sources• forest• urban and suburban Waimea
– Stormwater runoff– septic tanks
• Lalamilo farm lots• grasslands and scrublands
– fire– overgrazing– feral ungulates
• Coastal resort
Stream after a fire (excessive sedimentation)
Potential sediment and nutrient sources• forest• urban and suburban Waimea
– Stormwater runoff– septic/cesspools tanks
• Lalamilo farm lots• grasslands and scrublands
– fire– overgrazing– feral ungulates
• Coastal resort
Original Plan did not meet EPA 9 elements
• Without the 9 elements there is no EPA 319 funding
• Need a rationale for selection of BMPs
• Currently re-writing plan to meet requirements
EPA 9 elements:What must be done prior to applying for funding
• Identify causes and sources of nonpoint pollutants (data limited)
• Quantify load reductions expected for selected BMPs (methodology not mature – using N-SPECT model)
• Have monitoring plan to evaluate if project is successful
N-SPECT model can (?) evaluate sources and pollutant loads with/without BMPs
Priority BMPs identified in draft plan
• conservation plans for farms• improved fire management• improved grazing management• riparian zone and post-burn
restoration
Proposed administrative BMPs identified in draft plan
• institute overlay district that explicity protects riparian areas
• Low Impact Development Outreach• Obtain cesspool information
Current status
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