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Wai‘ula‘ula Watershed Plan

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

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Wai‘ula‘ula Watershed Plan

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  1. Wai‘ula‘ula Watershed Plan • Background • Watershed condition • Status of plan

  2. Wai‘ula‘ula watershed

  3. headwaters Intermittent flow in middle and lower reaches groundwater seep

  4. Current and future land use

  5. Background on watershed plan .... • focus on nonpoint pollutants • prerequisite for EPA funding of BMPs • MKSWCD lead agency • Carolyn Stewart lead writer

  6. 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

  7. 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

  8. 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

  9. Stream after a fire (excessive sedimentation)

  10. 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

  11. 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

  12. 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

  13. N-SPECT model can (?) evaluate sources and pollutant loads with/without BMPs

  14. Priority BMPs identified in draft plan • conservation plans for farms • improved fire management • improved grazing management • riparian zone and post-burn restoration

  15. Proposed administrative BMPs identified in draft plan • institute overlay district that explicity protects riparian areas • Low Impact Development Outreach • Obtain cesspool information

  16. Current status

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