Manzanita Village


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Manzanita Village

  1. 1. manzanita village: a case study turning lemons into lemonade jennifer j. bitting, pe central coast water board
  2. 2. out line <ul><li>what is manzanita village? </li></ul><ul><li>project setting </li></ul><ul><li>project history </li></ul><ul><li>water quality results </li></ul><ul><li>beneficial outcomes </li></ul><ul><li>sustainabliliy review </li></ul><ul><li>lessons learned </li></ul>
  3. 3. manzanita village: ucsb housing complex <ul><li>6 acre site </li></ul><ul><li>eleven 3-story buildings </li></ul><ul><li>six 4-story buildings </li></ul><ul><li>houses 800 students </li></ul><ul><li>opened september 2002 </li></ul>
  4. 4. project setting <ul><li>mediterranean climate </li></ul><ul><li>marine terrace deposits on sisquoc shale </li></ul><ul><li>clay subsoil </li></ul><ul><li>degraded grassland and vernal pool landscape </li></ul><ul><li>bordered by the pacific ocean and campus lagoon </li></ul>
  5. 5. original design <ul><li>traditional underground storm sewer system </li></ul><ul><li>buildings too close to vernal pools </li></ul>no treatment - discharge of phosphorus and nitrate polluted water to the beach, surfer-filled waters? no volume reduction increase rate of bluff erosion habitat for endangered species designed to meet federal wetland guidelines but not state requirements plans needed to be modified – ecology professors and research students used the opportunity to recommend bioswales and wetlands to aid in site drainage
  6. 6. new design <ul><li>75% of the project area flows through biofiltration systems </li></ul><ul><li>1300 linear feel of swales </li></ul><ul><li>4 swale systems with 43 bioswale basins </li></ul><ul><li>8 experimental plant palettes </li></ul><ul><li>2 stormwater wetlands </li></ul><ul><li>1 vernal marsh </li></ul><ul><li>3 vernal pools </li></ul>
  7. 7. new design <ul><li>bioswales </li></ul><ul><li>8 experimental plant palettes using: </li></ul><ul><ul><li>3 rushes: </li></ul></ul><ul><ul><ul><li>juncus mexicanus </li></ul></ul></ul><ul><ul><ul><li>juncus patens </li></ul></ul></ul><ul><ul><ul><li>juncus phaeocephalus </li></ul></ul></ul><ul><ul><li>3 sedges: </li></ul></ul><ul><ul><ul><li>carex praegracilis </li></ul></ul></ul><ul><ul><ul><li>eleocharis macrostachya </li></ul></ul></ul><ul><ul><ul><li>scirpus maritimus </li></ul></ul></ul><ul><ul><li>single species basins </li></ul></ul><ul><ul><li>rush basins </li></ul></ul><ul><ul><li>sedge basins </li></ul></ul><ul><ul><li>rush and sedge basins </li></ul></ul><ul><ul><li>control basins </li></ul></ul>bioswale planting september 2002 bioswale vegetated august 2003
  8. 8. results <ul><li>water quality results </li></ul><ul><li>99.5% reduction in nitrates </li></ul><ul><li>81.8% reduction in phosphates </li></ul>
  9. 9. beneficial outcomes <ul><li>potable water vs. reclaimed water </li></ul><ul><li>bioswale clippings make nutrient rich mulch for university landscaping </li></ul>bioswales watered with reclaimed water grew faster during the plant establishment phase and consequently were able to treat storm water more effectively . using reclaimed water reduced the use of potable water and reduced the water bill .
  10. 10. sustainability review <ul><li>environment </li></ul><ul><ul><li>provides habitat for endangered species </li></ul></ul><ul><ul><li>reduces pollutants discharged to campus lagoon </li></ul></ul><ul><ul><li>does not contribute to bluff erosion </li></ul></ul><ul><li>economics </li></ul><ul><ul><li>reduces $ spent on mulch </li></ul></ul><ul><ul><li>reduces potable water bill (used reclaimed water for plant establishment) </li></ul></ul><ul><ul><li>takes the place of ordinary landscaping (not irrigated) </li></ul></ul><ul><ul><li>does not contribute to loss of real estate (bluff erosion) </li></ul></ul><ul><ul><li>less $ spent on underground storm sewer installation and maintenance </li></ul></ul><ul><li>social </li></ul><ul><ul><li>boardwalks, viewing terraces and bike trails control traffic and restrict access to the fragile habitat </li></ul></ul><ul><ul><li>entirely wheelchair accessible </li></ul></ul><ul><ul><li>educational signs inform students about animal and habitat sensitivity </li></ul></ul><ul><ul><li>public health benefit: water is treated before discharge to the beach and ocean </li></ul></ul>
  11. 11. lessons learned <ul><li>design low impact development into the project in the first place! </li></ul><ul><ul><li>design cost savings not realized; project had to be designed twice. </li></ul></ul><ul><li>utilize design change opportunities to make projects more sustainable! </li></ul><ul><li>take advantage of mistakes </li></ul><ul><ul><li>potable vs. reclaimed water </li></ul></ul>
  12. 12. sources & more info <ul><li>more info: </li></ul><ul><ul><li>ucsb cheadle center for biodiversity and ecological restoration </li></ul></ul><ul><ul><li>(805) 893-2401 </li></ul></ul><ul><ul><li> </li></ul></ul><ul><li>sources: </li></ul><ul><ul><li> </li></ul></ul><ul><ul><li> </li></ul></ul><ul><ul><li> </li></ul></ul>