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Items to Consider

Compaction of Soils during construction Decompaction of Soils prior to placement of topsoil

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Often the addition of topsoil, sod, rock, splash pad, etc. is not considered during design or construction and flows are hindered. Water Quality Elevation Grass blocking flows Rocks above flow line blocking flows

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Gravel or rock rainscape must not extend over 3 feet in width.

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“Another flaw in the human character is that everybody wants to build and nobody wants to do maintenance.” Kurt Vonnegut, Hocus Pocus

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Consider Maintenance During Design

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Direct link: https://www.austintexas.gov/department/stormwater-management

Green Stormwater Infrastructure – Maintenance Manual

Completed 2014

Includes:

Recommended maintenance schedule
Checklist of items to inspect/maintain for a

variety of stormwater control measures

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IDEAL CONDITIONS

No erosion or scouring of soil

in garden/berm/swale

No sediment or debris at inlet
r within garden/berm/swale
Uniform coverage with desired

vegetation; no weeds

Uniform mulch coverage
No visible compaction, water

drains within 2 to 3 days

Maintenance

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Erosion/Scouring

Erosion or scouring present; Mulch or topsoil is worn away by water flow Redistribute/replace mulch to consistent 3 inch depth; Cover extensive scouring with appropriately sized rock (typically 3 inch river rock)

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Remove sediment, leaves, debris, and trash from the inlet

Inlet Blockage

Sediment deposits or debris at the inlet

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If sediment deposits in discrete piles or uniformly covers bottom of basin, remove with hand tools. If vegetation is disturbed, replace with in-kind vegetation. Refer to Grow Green Native & Adaptive Plant Guide for information

n appropriate vegetation.

Sediment Buildup

Sediment/debris deposits greater than 3 inches deep in bottom of basin

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Drawdown Time - How fast should the rain garden empty after it rains?

The City of Austin recommends a drawdown time goal of no more than 2-3 days. Why 3 days?

Odors
Mosquitos (typically take 4 to 5 days to hatch)
Could affect health of plantings

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505 Barton Springs Road