Two Anna’s hummingbird babies hatched about 15 days ago and are growing at exponential rates. The two of them barely fit in the nest. It will be a sad day to see them leave but we are hopeful to see mom next year, same time, same tree and start a new family. Happy spring to all!

We broke ground last month on a Low Impact Development (LID) project in Taipei, Taiwan. This is our first LID project in Taiwan and one of the first LID demonstration projects in Taiwan using US design methods.

The project site is located at the Dihua Sewage Treatment Plant in Taipei. This LID retrofit project provides pervious parking space and connection pathways for staff and visitors. The total area is about 9,530m2, which includes 98 “green” vehicle parking spaces while protecting 111 existing trees. To collect, treat, and detain stormwater onsite, we designed subsurface gravel storage, porous asphalt, rain gardens, and constructed wetlands.

All the LID tools will be constructed and fully functional prior to the rain season. On average, Taiwan experiences three typhoons every year (July-September), providing much of the water supply, but also causing damage, flooding, and landslides. This new infrastructure will help build in resiliency to combat more intense storm events resulting from climate change.

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We are providing a comprehensive stormwater quality solution for all stormwater runoff generated within the university campus and entering the Yudai River which borders the campus. The goal of this project is to meet to meet Class IV water standards in the Yudai River. The design team developed treatment facility sizing tools to design 23 Gravity Swales™ at each stormwater outfall. The Gravity Swales™  is a gravity fed bio-retention technology using high performance media in combination of TSS removal technology. A total treatment area of 11,606 m2 is being provided.

Regional stormwater treatment facilities are an alternative solution to parcel based low impact development (LID) when trying to meet water quality treatment goals in urban settings.  Urban retrofit projects are challenging due to many site constraints (i.e. narrow median strips, lack of green or open spaces, and areas built on structure) . Our design team needed to look beyond parcel scale approaches and identified larger sites to provide regional treatment. Capture In ZhenJiang, China, we designed a system called the Waterfall Treatment System (WTS) that is only 2000m2 but capable of treating runoff from a surrounding 120 ha area. This high-performance system contains a gravity pre-filter bay, followed by dispersion weirs and four engineered media filter beds. Under drains collect the filtered water at an infiltration rate of 100 cm/hr. Construction ImageCurrently under construction, the system is designed to removal 80% total suspended solids, 50% total phosphorus, 60% dissolved zinc, and 30% dissolved copper. This type of system should be added to your suite of tools when addressing stormwater water quality improvements in urban settings.

 

 

Tongxi waterway

GEO worked with SWA Group (the landscape architect) in designing a 4km waterway that will connect an existing and future lake. This waterway ranges from 30 to 50 meters in width weaving its way through planned residential and retail neighborhoods. We built a Civil 3D surface to determine the optimal waterway alignment and calculated cut and fill volumes. A total of 2,300,000 cubic meters of material will eventually be excavated and used to support adjacent development projects. We will keep you posted on progress!

 GEO wishing the best to friends and family in this New Year!

GEO在新年来临之际为家人和朋友送上最诚挚的祝福!

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