RE: [vernalpool] using a retention basin to create a wetland

Hi Phillip,

I am not an engineer, so I don't want to recommend. I do often see stones between the forebay and the main pond, probably to prevent erosion of the barrier between the two ponds when the water in the forebay tops the barrier and flows to the main pond. The primary area where there is high flow is at the inlet to the forebay.

Karro
Sent from my. Android Phone

-----Original message-----
From: PHILLIP BONN <philbo5678@verizon.net>
To: "vernalpool@yahoogroups.com" <vernalpool@yahoogroups.com>
Sent: Fri, Apr 20, 2012 03:19:57 GMT+00:00
Subject: RE: [vernalpool] using a retention basin to create a wetland

Thanks for the reply Karro!

Ok, the forebay is going to be separated from the main pond by a level
spreader according to the plans. Would you suggest having a grouping of
stones near this point in the main pond to dissipate the water flow/force?

From: vernalpool@yahoogroups.com<mailto:vernalpool%40yahoogroups.com> [mailto:vernalpool@yahoogroups.com<mailto:vernalpool%40yahoogroups.com>] On
Behalf Of Karro Frost
Sent: Thursday, April 19, 2012 10:53 PM
To: vernalpool@yahoogroups.com<mailto:vernalpool%40yahoogroups.com>
Subject: Re: [vernalpool] using a retention basin to create a wetland

Hi Phillip,

The "inlet pond" is a sediment forebay. This is a place for the sedimnt to
settle out before it enters the bigger pond. The forebay will probably need
to be cleaned out more frequently than the other retention pond. It is
important to remember than all stormwater structures/ponds, no matter how
nice the habitat is for critters within them, do need to be maintained, some
more frequently than others. Often I see the two ponds separated by a riprap
divider or level spreader.

There are several good stormwater manuals online - look for state of
Washington, Massachuetts, Wisconsin, and stormwater. EPA also has very good
resources.

As to plants, I would stay away from cattails initially as many people see
them as weeds, and will be anxious to control them. If they are in the area
they will come in without your help and take over the ponds a little futher
into the future. I person ally love cattails and nesting redwing
blackbirds... different species of frogs have different preferences for
shoreline vegetation. Use plants common in wetlands that have the species
you want to attract. I also suggest all natives and plants that bloom, such
as caltha palustris, pickerelweed, Saggitaria species, etc.

I hope this helps - have fun with it.

Karro

Sent from my Android Phone

-----Original message-----
From: PHILLIP BONN <philbo5678@verizon.net<mailto:philbo5678%40verizon.net> <mailto:philbo5678%40verizon.net>
>
To: "vernalpool@yahoogroups.com<mailto:vernalpool%40yahoogroups.com> <mailto:vernalpool%40yahoogroups.com> "
<vernalpool@yahoogroups.com<mailto:vernalpool%40yahoogroups.com> <mailto:vernalpool%40yahoogroups.com> >
Sent: Fri, Apr 20, 2012 02:05:53 GMT+00:00
Subject: [vernalpool] using a retention basin to create a wetland

Hello everyone,

I have been given the opportunity to design and create a wetland habitat for
frogs using a retention basin being built for a retail development.
There will be two basins constructed, one a third the size of the other, the
smaller one would be the inlet 'pond'.

What I would like if someone could point me to some online resources
regarding the best practices in the construction of a 'wetland'.
Specifically about the need for a zone to trap coarse sediment and also to
play an energy dissipation role to reduce disturbing the vegetation. I have
yet to find good detailed information on a design for one.

Also I would appreciate any suggestions on the best mix of plants for the
'wetland' that would promote usage by frogs and others. Currently I have in
mind the following: cattails, marsh marigold [Caltha palustris], Joe Pye
weed [Eupatorium purpureum], turtlehead [Chelone glabra] and a few others.

Any help would be appreciated

Phillip Bonn
Manlius Greenspace Coalition
Fayetteville, NY

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