HomeMy WebLinkAboutApproved Storm.pdfPermit Number:Approved By:Date:
EXHIBIT A - SITE PLAN
TYPICAL SPLASH BLOCK TYPICAL 10-FOOT DISPERSION
TRENCH CROSS-SECTION
TYPICAL DRIVEWAY APPLICATION OF DISPERSION TRENCH AND ROCK PAD
SIDE VIEW
NTS
HOUSE
DOWNSPOUTEXTENSION
SPLASHBLOCK
ROOF DOWNSPOUT
SPLASH BLOCK
100' MIN. VEGETATEDFLOWPATH UNDERFULL DISPERSION,
SEE SECTION C.2.1.3
10-foot long
dispersion trench
Vegetated Flowpath
Segment (NVFS)
Slot drain Diagonal asphalt berm – 2 to 4 inches high
PLAN VIEW OF DRIVEWAY
NTS
2-ft x 3-ft x 6-inch
crushed rock pad
50-foot separation between
flowpath segments
Vegetated
Flowpath Segment
Edge of undisturbed
native vegetation
Page 7 of 7
MAINTENANCE INSTRUCTIONS FOR A PERFORATED PIPE
CONNECTION
Your property contains an on-site BMP (best management practice) called a “perforated pipe
connection,” which was installed to reduce the stormwater runoff impacts of some or all of the
impervious surface on your property.
A perforated pipe connection is a length of drainage conveyance pipe with holes in the bottom,
designed to “leak” runoff, conveyed by the pipe, into a gravel filled trench where it can be soaked into
the surrounding soil. The connection is intended to provide opportunity for infiltration of any runoff
that is being conveyed from an impervious surface (usually a roof) to a local drainage system such as a
ditch or roadway pipe system. This on-site BMP shall be maintained per Appendix A of the City of
Renton’s Surface Water Design Manual.
MAINTENANCE RESTRICTIONS
The size and composition of the perforated pipe connection as depicted by the site plan and
design details must be maintained and may not be changed without written approval from the
City of Renton or through a future development permit from the City of Renton.
The soil overtop of the perforated portion of the system must not be compacted or covered
with impervious materials.
RECORDING REQUIREMENT
These perforated pipe connection on-site BMP maintenance and operation instructions must be
recorded as an attachment to the required declaration of covenant and grant of easement per
Requirement 3 of Section C.1.3.4 of the City of Renton Surface Water Design Manual. The intent of
these instructions is to explain to future property owners, the purpose of the BMP and how it must be
maintained and operated. These instructions are intended to be a minimum; the City of Renton may
require additional instructions based on site-specific conditions. See the City of Renton’s Surface
Water Design Manual website for additional information and updates.
TYPICAL PERFORATED PIPE CONNECTION FOR A SINGLE FAMILY RESIDENCE
Page 8 of 8