April 2021 - Parks & Recreation - 43

by offsetting the fill volume within the floodplain by removing the
same amount through excavation.
In most other developments, the
areas excavated for floodplain mitigation are seeded and left unattended after completion.
" However, the Houston Botanic
Garden incorporated this area as a
part of the garden to demonstrate
a unique natural land feature, usually located alongside a waterway,
that can become inundated during
high-water events, " Ooi explains.
" After the water is recessed, naturally formed depressed areas in the
Coastal Prairie temporarily hold
water, and, over time, a unique ecosystem is developed in this area for
flora and fauna. "
Furthermore, the garden's innovative drainage structure in the
	

Stormwater Wetlands was designed so it could be partially hidden within the bank of the pond's
slope. During a rain event, the
amount of water that fills the area
depends on the size of the storm
event. Water above the Stormwater
Wetlands area becomes detention
volume. The structure's weir wall
controls stormwater release, draining within 24 to 48 hours.
Included in the weir wall are
small orifices designed to control
the water level and regulate release.
These are water-flow control to
imitate the pre-development storm
runoff. During a rain event, the
pond water level will rise beyond
the Stormwater Wetlands, and the
detained stormwater will be released slowly into a nearby stream
through an orifice. A valve system

Garden designs accommodated existing
trees on-site and developed strict criteria
for working around them.

allows additional control of the water level for maintenance purposes.
One valve drains the entire Stormwater Wetlands, and a second valve
controls the water level in the area.

Valuing Conservation 
Knowing the importance of water
as a valuable natural resource for
the garden, an additional riser structure was designed for the children's
lagoon. A small aquatic garden
surrounds the lagoon, which is separated into two sections. The riser
structure is hidden underneath a
decomposed granite pathway - the
only portions visible are the screen
and the concrete top of the structure.

PA R K S A N D R E C R E AT I O N .O R G | A P R I L 2 02 1 |

Parks & Recreation

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April 2021 - Parks & Recreation

Table of Contents for the Digital Edition of April 2021 - Parks & Recreation

April 2021 - Parks & Recreation - Cover1
April 2021 - Parks & Recreation - Cover2
April 2021 - Parks & Recreation - 1
April 2021 - Parks & Recreation - 2
April 2021 - Parks & Recreation - 3
April 2021 - Parks & Recreation - 4
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April 2021 - Parks & Recreation - 55
April 2021 - Parks & Recreation - 56
April 2021 - Parks & Recreation - Cover3
April 2021 - Parks & Recreation - Cover4
https://ezine.nrpa.org/nrpa/ParksRecreationMagazine/july-2022
https://ezine.nrpa.org/nrpa/ParksRecreationMagazine/june-2022
https://ezine.nrpa.org/nrpa/ParksRecreationMagazine/may-2022
https://ezine.nrpa.org/nrpa/ParksRecreationMagazine/april-2022
https://ezine.nrpa.org/nrpa/ParksRecreationMagazine/march-2022
https://ezine.nrpa.org/nrpa/ParksRecreationMagazine/february-2022
https://ezine.nrpa.org/nrpa/ParksRecreationMagazine/january-2022
https://ezine.nrpa.org/nrpa/ParksRecreationMagazine/december-2021
https://ezine.nrpa.org/nrpa/ParksRecreationMagazine/november-2021
https://ezine.nrpa.org/nrpa/ParksRecreationMagazine/october-2021
https://ezine.nrpa.org/nrpa/ParksRecreationMagazine/september-2021
https://ezine.nrpa.org/nrpa/ParksRecreationMagazine/august-2021
https://ezine.nrpa.org/nrpa/ParksRecreationMagazine/july-2021
https://ezine.nrpa.org/nrpa/ParksRecreationMagazine/june-2021
https://ezine.nrpa.org/nrpa/ParksRecreationMagazine/may-2021
https://ezine.nrpa.org/nrpa/ParksRecreationMagazine/april-2021
https://ezine.nrpa.org/nrpa/ParksRecreationMagazine/march-2021
https://www.nxtbookmedia.com