STORMWATER TOOL BOX 4.1

Transcription

1 STORMWATER TOOL BOX 4.1 Median Significant portions of the median will incorporate lowland areas to receive stormwater runoff from one or both sides of the street depending on the final road cross section. Sidewalk Planters The furnishing zone of the sidewalk will integrate stormwater treatment facilities. The location and quantity depends on the final road cross section. Off-Site Locations Addition areas for stormwater treatment may be necessary depending on the final road cross section. They can also be integrated into expanded sidewalk areas to feature sustainability principles at public gathering spaces. Pervious Paving An element from the LGVCP. This probably needs an expanded area to work, like at a pearl. Question: Comments?

2 STORMWATER PLANTING DESIGN 4.2 Three Planting Types We are focusing on a natives plus plant pallette as directed earlier in the process. We have a few different conditions to work with: Median Stormwater (Low and et areas) Median Upland Furnishing Zone Stormwater Furnishing Zone Upland As we begin to move towards selecting a more defined plant pallette, think about how the planting design should reinforce the identity of the corridor. Questions: What do you want the character / feel of the plant design to be? Should the upland and stormwater zones be similar feeling or different? Should the median and furnishing zone plantings have a similar feeling or not? (If the road cross section allows it) Native / Natural Feel Informal / naturalistic plant layout Greater variety in plant sizes Taller understory More deciduous plants Emphasis on bark and texture Greens and browns are prevalent This is similar to the concept suggested by the refinement plan. Elevation Diagram Plan Diagram Farm / Cultivated Feel Varying plant layouts, some rows or groups, some more naturalistic layout. Focus on Flower - Foliage - Fruit A couple of understory heights, row crop / groundcover height and a low shrub height. A pronounced shift in seasonality, growing season and fallow season. Elevation Diagram Plan Diagram Contemporary / Modern Feel Structured plant layout Clean lines and modest plant heights Blocks or drifts of plants Focus on functional plants Grasses, sedges and low shrubs. Elevation Diagram Plan Diagram

3 TIGARD MAIN STREET 4.3 We assume the PAC members have visited this recently completed project. Applicable elements for the BFR project would be: 1 - Linear swales in the furnishing zone. These are wider than what BFR will have room for within the standard 9 sidewalk. 2 - Plant species and planting character 3 - Structure design, maybe. The streetscape has art elements integrated with the lighting. Question: What do you think about the lighting / artwork? Burnham Street

4 124th TUALATIN 4.4 We assume the PAC members have visited this recently completed project. Works very similar to the shed road cross section under consideration for BFR, the median treats the higher half of the road and the lower half is treated in the planter strip / furnishing zone next to the sidewalk. Planting design uses a small pallette of common plants (both stormwater selections and upland appropriate in repetitive patterns. Question: What is your least favorite part of this design?

5 DIVISION STREET 4.5 Integrates stormwater facilities in curb extensions and furnishing zones along corridor. Original plant palette was more ambitious, refined (reduced variety) by BES during review. Crosswalks integrated with facilities, this could be used at BFR at the median pedestrian crossings. Art elements integrated with stormwater facilities. Narrow facilities along south side would be similar to BFR sidewalk furnishing zone facilities.

6 SANDY BLVD. 4.6 BENCHES EXISTING CONIFER TREES TO REMAIN STORM WATER FOCAL POINT ACCESS BRIDGE OVER STORMWATER NEW TREES CONCRETE SEAT WALL WELLS FARGO BANK RELOCATED DRINKING FOUNTAIN ON-STREET PARKING RELOCATED MEMORIAL PLAQUE STORMWATER INLET, TYP. N.E. 42ND AVE. PARKERS JEWELRY CENTRAL PLAZA STORMWATER AREA, TYP. BURGER BAR INFORMATION KIOSK EXISTING TREES RELOCATED TABLES NOT TO SCALE N.E. SANDY BLVD. Created larger rain gardens at intersections by removing unnecessary road paving. Also creates public open space ( some would be more utilized as public space when adjacent properties redevelop to a more compatible use). If BFR needs additional treatment area, rain gardens can be integrated in expanded sidewalk areas (LO acquires private property).

7 MONTGOMERY GREEN ST. 4.7 Linear spine of stormwater facilities that help reinforce an east-west pedestrian corridor through the heart of the PSU campus. The narrow facilities fit into the pedestrian environment appearing more like landscape elements rather than deep stormwater facilities. Keeping them shallow at the surface was the key, but they have capability to handle the entire plaza surface runoff. Plantings are simple, but planted densely to provide lush greenery. Quaking Aspen trees were used and adapted quickly, but may have long-term stability problems in an artificial environment of a treatment facility.

8 STORMWATER FACILITY PLANTS 4.8 Trees: Elizabeth Hedge Maple Jacquemontii Birch Hackberry Goldenrain Tree Black Tupelo Canada Red Chokecherry Shumard Oak Cascara Herbaceous Plants: Dense Sedge Ice Dance Carex Slough Sedge Tufted Hairgrass Blue Oat Grass Spreading Rush Shrubs: Kelsey Dogwood Boxleaf Euonymous Mahonia nervosa Birchleaf Spiraea Japanese Spiraea Groundcovers: Kinnickinnick Coast Strawberry Mahonia repens Creeping Bramble Accent Plants: Great Camas Common Camas Douglas Iris Oregon Iris Additional Plant Ideas Discussion/question: 1) Lake Oswego will adopt the Portland BES plant list for stormwater facilities as a base list and add other plants for character in there updated manual. What do you think of the plant list? Lupine Honeysuckle 2) General comment and discussion Liriope Pearly Everlasting

9 PORTLAND GREENSTREET TREE LIST 4.9 Elizabeth Hedge Maple Jacquemontii Birch Hackberry Goldenrain Tree Black Tupelo Canada Red Chokecherry Shumard Oak Cascara - Native!

10 POTENTIAL STORMWATER TREES 4.10 Madrone / Hybrids Cascara Serviceberry Aspens River Birch White Alder POTENTIAL ICONIC TREES Oregon Oak Incense Cedar Western Hemlock

11 PORTLAND GREENSTREET PLANT LIST 4.11 Dense Sedge Ice Dance Carex Slough Sedge Tufted Hairgrass Blue Oat Grass Spreading Rush Kelsey Dogwood Boxleaf Euonymous Leatherleaf Mahonia Birchleaf Spirea Japanese Spirea Kinnikinnick Coast Strawberry Creeping Mahonia Creeping Bramble

12 PORTLAND GREENSTREET PLANTS AND OTHERS Camas Douglas Iris Oregon Iris Lupine Honeysuckle Liriope Pearly Everlasting Douglas Aster Highbush Cranberry Wintercurrants Camellia Coneflower Flowering Quince Hybrid Mahonia Diane Witchazel

13 PORTLAND MEDIAN TREES AND VIEWS 4.13 Open spacing of trees Open spacing allows views of facades and signage Potential identity banners at intersections