Ahern

8/13/2019 Ahern

1/44

Urban Hydrology: theory and newapproaches for stormwater

management

Jack Ahern, Professor

Dept. of Landscape Architecture and Regional

Planning

UMass Amherst

8/13/2019 Ahern

2/44

The site is to the watershed as the cell is to the bodyPatrick Condon, 2000

8/13/2019 Ahern

3/44

Hydrograph

Subtitle

8/13/2019 Ahern

4/44

Urban Conditions: Impervious Surface Cover

Subtitle

8/13/2019 Ahern

5/44

Increased impervious surface increases runoff, decreases

evapotranspiration, and decreases infiltration

Percentage of Impervious Surfaces

8/13/2019 Ahern

6/44

Urban Hydrology

8/13/2019 Ahern

7/44

8/13/2019 Ahern

8/44

Increased Impervious Cover Affects the Numberand Quality of Aquatic Lifee

8/13/2019 Ahern

9/44

Stormwater: The Conveyance

Approach

Stormwater conveyance is the rapid removal

of stormwater from impervious surfaces toreceiving streams by way of engineered

drainage systems (e.g. culverts, stormdrains,

and channelized streams and rivers).

water is a problem. Its the enemy. Get itaway from here.

NOW!

8/13/2019 Ahern

10/44

Stormwater: The

Infiltration ApproachInfiltration is the the retention of

stormwater as close as possible to its

originating source(s), and infiltrating asmuch as possible into the soil through

the implementation of best

management practices and strategies.

water is a precious resource, keep ithere, clean it, save it for later - we need

it, and our local our ecosystems need it

too!

8/13/2019 Ahern

11/44

Guidelines:

1. Start at the source

2. Integrate the solutions

3. Maximize permeability

4. Minimize directly

connected impervious areas

5. Use drainage as a designelement

8/13/2019 Ahern

12/44

Stormwater Best Management Practices (BMPs)

Greenroofs

8/13/2019 Ahern

13/44


Rainbarrels

8/13/2019 Ahern

14/44


Raingardens

8/13/2019 Ahern

15/44

8/13/2019 Ahern

16/44


Raingarden Interpretive Sign

8/13/2019 Ahern

17/44


Streetside Raingarden

St t B t M t P ti (BMP )

8/13/2019 Ahern

18/44


Porous paving

8/13/2019 Ahern

19/44


Porous paving

8/13/2019 Ahern

20/44


Biofilter, created wetland

8/13/2019 Ahern

21/44


Greenwalls

8/13/2019 Ahern

22/44

Integrated Solutions: Sustainable Community Design,

Condon and Proft, Vancouver BC

8/13/2019 Ahern

23/44

Integrated Solutions: Green parking, Wild Center, NY

8/13/2019 Ahern

24/44

Integrated Solutions: SEA Street Seattle

8/13/2019 Ahern

25/44

8/13/2019 Ahern

26/44

Integrated Solutions: Potsdammer Platz, Berlin, Atelier Dreisitl

8/13/2019 Ahern

27/44


8/13/2019 Ahern

28/44


8/13/2019 Ahern

29/44


8/13/2019 Ahern

30/44


8/13/2019 Ahern

31/44

I t t d S l ti

8/13/2019 Ahern

32/44

Integrated Solutions: Kronsberg New Town, Hannover, Germany

I t t d S l ti

8/13/2019 Ahern

33/44

Integrated Solutions: Kronsberg New Town, Hannover, Germany

8/13/2019 Ahern

34/44

Hammarby Sjostad, Stockholm

150HA, mixed use brownfield development,

11,000 units, 25,000 population

8/13/2019 Ahern

35/44

TitleThe Hammarby Model: integrated, renewable, circular

8/13/2019 Ahern

36/44

Title

8/13/2019 Ahern

37/44

Title

Subtitle

8/13/2019 Ahern

38/44

Title

8/13/2019 Ahern

39/44

Stormwater Biofilter

8/13/2019 Ahern

40/44

8/13/2019 Ahern

41/44

Title

8/13/2019 Ahern

42/44

Title

UMass first raingarden/bioswaleLocation: North of Studio Arts Building

Design: Max Cohen, Michael Davidsohn, Jack AhernConstruction: Michael Davidsohns Stockbridge construction class + UMass Physical

Plant

8/13/2019 Ahern

43/44

Title

UMass first raingarden/bioswale: Under construction

8/13/2019 Ahern

44/44

Summing up:

Start at the source

Integrate Solutions

Ubiquitous Infiltration

Landscapes for Learning

Documents

Ahern