Bioretention / Rain Garden Design & Development in Hawaii

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Presentation transcript:

Bioretention / Rain Garden Design & Development in Hawaii Presented By: Lauren C. Roth Venu 808-781-7583 lauren@rothecological.com www.rothecologicaldesign.com

Picture by: The Daily Kos

SITE ASSESSMENT What type of Project (New, Redevelopment, or Retrofit)? Greenfield or Brownfield? What are the current drainage patterns? What are the potential pollutants of concern? Are there “sensitive” ecosystems on or downstream of the property? How will the development or redevelopment impact the predevelopment conditions (new development) Slopes steep? How vegetated? With what type of vegetation? Water Balance-How much water could be collected and is there a cost-benefit for storage to (re)use. For Retrofits- What landscapes are in place that could be converted to an ecological LID best management practice? What are the rainfall patterns? What are the types of soils? Other?

When ‘recharge’ is not possible Soil infiltration rate less than 0.5 inches/hour Soil infiltration rate greater than 3 inches/hour Known man-made plumes or contaminated soils Potential for concentrated pollutant/chemical spills Less than 3 ft. to high ground water table 50 ft. to groundwater drinking well 35 ft. to septic system 20 ft. to building foundation 10 ft. to property line 100 ft to down-gradient building foundation Slide by: City and County of Honolulu

Land Use Impacts: ex. Agriculture

Plant & Substrate Selection Soil & Plant Mixes: What are the pollutants of concern? What is the natural drainage of the site? Storage capacity Biochar & mycelium Native Plants Plants with good root structure Phyto/bioremediation

Rainfall Variance DBEDT USGS NOAA (PFDS)

Is the 1’’ 24hr storm event = to the 90th-95th percentile event Is the 1’’ 24hr storm event = to the 90th-95th percentile event? Managing Quality: 85th and 95th Percentile, 24-hour; and 100-yr, 2-hour storms (Source: City and County of Honolulu Kaneohe 0.78” 1.81” 5.56” Kailua 0.80” 2.01” 5.95” Hawaii Kai 0.92” 2.00” 4.61” Manoa 0.70” 1.42” 5.91” Punchbowl 0.70” 1.48” 5.29” Ewa 1.19” 2.33” 4.67” Waianae 1.25” 2.50” 4.29” Wahiawa 0.80” 1.64” 5.68”

Water Quality Volume P= Rainfall event (90-95 percentile) Rv = Runoff Coefficient A = the Contributing Area Qa = Runoff Volume (inches)

Stormwater: Quantity 20yr storm is now every 3-5yrs!

Education & Outreach

Navigating through permitting! Source: “Stormwater Management the Natural Way: Guide to Low Impact Design and Development”

Case Study 1: Kalepolepo Beach Park/Maui NOAA Whale Sanctuary, Kihei, Maui .

Case Study 2 (Retrofit): Windward Mall, Kaneohe, Oahu

Pre-existing Conditions

Drainage Area & Design Storm Volume

(3) Bioretention Systems

Grading

Connecting to existing storm sewer

Engineered Soil & Stone Spillways

Planting

Construction (close to) pau