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CITY OF

PACIFIC GROVE       

LID Techniques

There are six RainScapes LID Techniques preferred for private properties in Pacific Grove. You will find a general description of all the alternatives in this section:

  1. Roof Downspout Redirection
  2. Creating Rain Gardens
  3. Rain Water Harvesting
  4. Replacement of Impervious Surfaces with Pervious Surfaces
  5. New Tree Planting
  6. Gull Rooftop Deterrents

1. Roof Downspout Redirection

Click here for the Roof Downspout Redirection Design guidelines   

 
Downspout Redirection 1
Downspout Redirection 2

 

BENEFITS
  • Free “seasonal’ water for landscape
  • Slows roof/downspout runoff; reducing peak stormwater flows
  • Inexpensive and easy
  • Add a rain chain or bowl for decoration
CONSIDERATIONS
  • Runoff to be routed to a porous landscape, landscape depression, mulch pit, or gravel basin 
  • Overflow to be routed away from structures and neighboring properties
  • Cap downspout connection leading to stormdrain

2. Creating Rain Gardens (adding depressed planted areas that rain water will soak into)

Click here for the Creating Rain Gardens Design guidelines

Rain Gardens 1
Rain Gardens 2

 

BENEFITS

  • Adds an aesthetic landscape feature with endless planting design possibilities
  • Plants promote native habitat and food source for hummingbirds, butterflies, and honey bees
  • Promotes infiltration of stormwater
  • Slows stormwater runoff; decreasing peak storm water flows
  • Helps clean the stormwater through filtering it through the base material and soil
  • Add mulch and compost for added water retention
CONSIDERATIONS
  • The required size, shape, and depth of 
    the garden depend on how much water is captured (water should be drained within 
    48 hours). Ensure you property has enough space available
  • Rain gardens and swales to be located 
    away from building foundations and on a relatively flat area
  • Overflow to be routed away from structures 
    and neighboring properties
  • Irrigation will be needed for plant 
    establishment
  • Select appropriate plants (sun/shade, wind exposure, soil type, CA coastal native plants)
  • Regular landscape maintenance required to meet plant species needs. Regularly check 
    rain garden has a clear inlet and overflow 
    path
  • Cost varies per the size, planting design and whether a landscape contractor is used
  • For newly installed rain gardens which are mulched, be aware that after a large rain 
    event, bark may float and clog drains or 
    outlets
  • For larger systems, subsurface drains with
    base rock and/or an overflow inlet may be needed, this may require professional design and contractor fees for installation

 


3. Rain Water Harvesting (barrel or cistern)

Click here for the Rain Water Harvesting Design guidelines

Rain Water Harvesting 1
Rain Water Harvesting 2
Rain Water Harvesting 3

 

BENEFITS

  • Free water for landscape irrigation; reducing the need for potable water
  • Slow roof/downspout runoff; reducing peak stormwater flows
  • Plants prefer rainwater
  • Inexpensive and take little space
  • Easy to expand system
CONSIDERATIONS
  • Maintenance
  • Clean filters
  • Clean tank
  • Screen all vents
  • Prevent algae growth with a dark colored tank
  • Size: tanks with a capacity of 1,500 gallons require a permit
  • Route overflow pipe away from structures and neighboring properties
  • Provide a filter for excessive/large debris from rooftop
  • Non-potable

 

4. Replacement of Impervious Surfaces with Pervious Surfaces (removal of paved surfaces that rain flows over and into storm drains)

Click here for the Replacement of Impervious Surfaces with Pervious Surfaces Design guidelines

6 Paving
7 paving small
8 Paving

 

BENEFITS
  • Many types of pervious surfaces and paving types
  • Paver systems are easy to repair or replace
  • Promotes infiltration of stormwater
  • Slows stormwater runoff; decreasing peak storm water flows
  • Helps clean the stormwater through filtering it through the base material and soil
  • Beneficial to street trees as roots can have more access to air and water
  • Pavers enhance curbside appeal and increase property value
CONSIDERATIONS
  • Properly install/compact the base layer
    to ensure an even surface
  • The depth of the base layer and
    reinforcement should be considered based
    on the type of load the pavement will receive; installation by a certified contractor may be required
  • Be aware of underground utilities
  • Install pavers with the correct joint spacing
  • Pervious concrete or asphalt may
    require vacuuming over time
  • Typically more costly on large scale projects
  • Pervious surfaces and paving types
    vary in cost; research accordingly

 

5. Tree Planting

Click here for the Tree Planting Design guidelines

11 tree

BENEFITS
  • Trees add an aesthetic landscape feature and increase property values 
  • Screen unwanted views
  • Roots slows stormwater runoff; decreasing peak storm water flows
  • Add mulch and compost for added water retention
  • Trees provide oxygen and clean the air of pollutants
  • Trees prevent soil erosion
  • Trees can provide food
  • Trees provide a canopy and habitat for wildlife
  • Trees aid as a visual traffic calming measure
CONSIDERATIONS
  • Low maintenance once established
  • The larger the size of tree purchased (gallon or box size), the more expensive 
  • Be aware of overhead and underground utilities
  • Irrigation will be needed for plant establishment
  • Select an appropriate tree (sun/shade, wind exposure, soil type, California coastal native plants)

 

6. Gull Rooftop Deterrent Strategies For commercial Properties in the Business District

Click here for the Gull Rooftop Deterrent Strategies Design guidelines

12 bird
13 bird

 

BENEFITS
  • Keeps nesting birds out of expensive rooftop equipment areas and HVAC units
  • Keeps rooftop clean from contaminants entering the storm drain
  • Reduce the need for rooftop cleaning
  • Eliminate smells
  • Decrease bird noise 
CONSIDERATIONS
  • Can be costly depending on the type
    of bird deterrent chosen
  • Birds may adjust to the deterrent
    type which means alternative deterrents may need to be reinstalled
  • Some deterrents will need to be
    replaced over time depending on the deterrent. Regular monitoring is suggested