what’s a “basin”? a depression that holds water a bird bath what holds the water of lake...
TRANSCRIPT
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What’s a “Basin”?A depression that holds water
•A bird bath
•What holds the water of Lake Michigan
•What contains the water of an ephemeral pond
Does it hold water?Can you see an edge?
BasinEdge
…where the water-holding area ends and the non-water-holding area begins?
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Where’s the edge?Where the water ends when the basin is full . . . Easier to see in spring or after heavy rain.
Where the plants haven’t grown or are stunted because the soil was flooded for awhile
April 18
August 14
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Where’s the edge?
In shaded pond, where the vegetation type changes . . . often to dense carpets of nettles or jewelweed
Where there’s a break in the slope
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Not every PEP is a BasinThis pile of dark colored rocks was mistaken for ponded water on the aerial photo and mapped as a PEP
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Not every PEP is a BasinNo sign of a Basin here in 2008. The aerial photo used to map PEPs was taken in 2005. Perhaps the lone large tree in the field was mistaken for a small pond?
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Not Every Basin is an Ephemeral PondToo shallow? This PEP was only a few inches deep in April after lots of rain.
Too small? The size of a picnic table. Most EPs are larger than a bedroom.
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Not Every Basin is an Ephemeral PondNo sign of water, even in early spring
Water lilies indicate the pond is permanent
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Why we need to visit more than once
In April 4-ft deep, but dry by fallStill deep in October, receives storm water runoff all summer
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Typical Ephemeral Pond• Basin holds water long enough to support some aquatic organisms
• Dries out by summer or fall in most years
• When full, the water depth is usually less than 4 feet but more than 6 inches.
• Most are less than an acre (200 ft x 200 ft)
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In the Woods or in the OpenOne of the smallest . . . About 30 feet x 100 ft
Small, but big enough to attract a flock of waterfowl
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What if there’s no Pond Basin?• Check that you’re in the right place
• If its obviously not a Basin, mark “no” and use comment line to tell us what it is
• Take a photo to document – our mappers want to know what fooled them
• If you’re not sure go on and complete the form
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Is the Basin Connected to another water feature?
What looks like 1 Basin in April may turn out to be 2 Basins by July
This Basin might be connected to a small stream
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Pond Within a Floodplain Swamp
May 30
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Is Basin Connected to Another Water Feature?
One pool or multiple pools?:
• as pond draws down, multiple pools may form.
• use best judgment at lower size limit (i.e., don’t include boot prints)
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Check for:
• connection between other pond basins
• comment on any relationship
Is the Basin Connected to another Water Feature?
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Find picture of ephemeral pond in marsh
Pond Within a Floodplain Swamp
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Pond Within Wetland Meadow
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Pond Within a Marsh
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Width
Leng
th
Basin Full of Water Dry Basin
Pacing Out Basin Dimensions
Leng
th
Width
Pace parallel to water’s edge at first visit in early spring
Pace through formerly ponded area after pond dries out
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Width
Leng
th
Pacing Out Irregular Basin Dimensions
•Guesstimate to average out the irregularities
•Aim for getting area about right
•Sketch it out if you want
•Don’t sweat it! (we don’t pay by the square foot)
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Signs of high water The swollen base of this trunk is a response to low oxygen during flooding
Water marks on nearby trees are always at the same elevation
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Water Depth and Maximum Water Depth
Measure Water Depth each visit!
at the deepest point…safely
…or estimate
Notice the high water marks on the trees
Maximum Water Depth is as deep as the pond gets. Usually the same as Water Depth in very early spring.
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Max Water Depth = Water Depth + Distance from Water to High Water Mark
Measuring Maximum Water DepthMeasure “Water Depth” (blue line) at deepest point
Find high water mark on tree standing in water
Measure vertical distance from the water surface to high-water mark indicator (brown line). Add together for Maximum Water Depth.
Water Depth
Current Water Surface
Highest Water Level (Previous) High Water Mark on tree
Distance from Water Surface to High Water Mark
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Estimating High Water Depth
• When the current water level is below the base of any indicator tree, or there are no trees, then get your best estimate with an “indirect measure”. Like with Water Depth, approximate is fine. An estimate within a half foot is still helpful
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Signs of Ponding -- Water Stained Leaves
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Signs of Ponding -- Water Stained Leaves
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Signs of Ponding – Buttressed Roots
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Surface water covering the basin?Less than 10% . . . hardly any water left
10 to 50% . . . some water but lots of the basin exposed
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Water Temperature:
• measure at deepest point 3-5cm from bottom
•let thermometer stabilize for 1 minute
• estimate to nearest degree
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Pond #12 at MNP
May 24 October 18
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Tree Canopy Covering the Basin?
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Basin Disturbance
• Filling• Refuse• Tire Ruts• Sediment• Cultivation• Invasive Plants
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Reed Canary Grass
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Purple Loosestrife
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Turbidity from Stormwater Runoff
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Test time . . . Edge? Basin Cover?
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Test time . . . Edge?
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Test Time . . . Edge, Depth, Ground Cover, Trees in the Basin?
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It’s OK to say, “I don’t know.”
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