Archive for February, 2009

Event Lawn Re-design

Tuesday, February 17th, 2009

With generous support from East Bay Municipal Utilities District’s Water Smart Program we redesigned the event lawn at the hub of the garden. We reduced our amount of turf grass and replaced it with a large area of permeable pavement and mulched beds planted with replacement plants consisting of drought tolerant species. We also replaced our inefficient irrigations system with new low water use irrigation systems.

The project was designed by a team of students, garden staff, volunteers and  a professor from the Landscape Architecture department. It was built over 9 months by a large team of students, staff and volunteers.

The project was complicated to construct because of the site’s popular location. It is centrally located on the property where there are views into other parts of the garden and also there is a stunning view of the bay and the Golden Gate Bridge. For this reason we wanted to keep the area open as much as possible during construction. We often got help and advice from neighbors and visitors when we encountered building issues as we were constructing the new lawn area.

The Landscape Architecture students taking a materials and construction class in the Landscape Architecture program are designing and building a bench to be included in the design. (See Bench Postings)

Download Project Sign PDF

Creek Restoration Project

Friday, February 13th, 2009

The creek restoration project began about a year ago when we started removing Himalayan Blackberry bushes and Algerian Ivy from the creek bed and trees. The creek is an upper part of Cerrito Creek and is fed mostly by urban runoff when it rains. The creek fills at an alarming rate (see time lapse video).  We wanted to see where this water was coming from,  and assess the condition of the creek bed and creek bank. We soon uncovered a rotting bridge, an older restoration project done in the 1970’s with retaining walls made of concrete bags, some pools that had been made, lots of chatter was strewn in the creek bed, some undercutting and erosion.

PHD candidate Kristen Podolak and MLA candidate Jessica Ludy surveyed the creek that had been opened up by staff and volunteers to start to create a new plan for restoration. (download Kristen & Jessica’s paper)

Later Nathanial Behrends, Master of Landscape Architecture Candidate,  from LA 227  Restoration of Rivers and Streams,  after reviewing Kristin’s work and evaluating the condition of the newly uncovered upper area recommended  a series stepped pools for the creek to slow the water coming through the channel to decrease the cutting of the banks. (download Nathanial’s paper)

After more removal of berries on the upper part we then discovered the creek was blocked with silt and urban debris that was diverting it from the original channel and creating scouring and cuts in the upper part of the garden. We removed the debris and restored the water to the original channel.

A group called The Weed Warriors led by Susan Schwartz of Friends of Five Creeks came in recently to eradicate some of the blackberries.
(view time lapse video of The Weed Warriors at work)

As we clear more weeds from the creek new opportunities emerge.

Creek Stone Path

Thursday, February 12th, 2009

As the creek is being cleared of invasive species, new opportunities for design emerge. Recently volunteers and staff have cut into the overgrowth in the lower part of the Australian hollow next to the creek. As a result a beautiful path with a view into the creek has been developing. With Mike’s skills in stone building and Nathan’s enthusiasm for anything related to the garden and lots of hard work by others, a path with stone steps  now exists on the south creek. A waterfall can be seen from the path that meanders through a small thicket of Bay Laurel trees. More clearing of the berries will continue and the path at some time in the future will connect the upper part of the creek with the lower part.

Seep Project

Thursday, February 12th, 2009

An old seep exists under the parking structure just west of the event lawn. Peter, a volunteer has been developing an aqueduct system from the seep to feed into a large 1400 gallon cistern that is situated in the middle of the Australian Hollow. We will use the water to water a student “LIVING WALL” project that is being developed for the San Francisco Garden show display. The aqueduct is made from bamboo found on the property.