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#474516 - 06/20/17 10:48 AM Feeder Creek Sediment Control
Matzilla Offline


Registered: 08/12/16
Posts: 102
Loc: Iowa
Guys I'm currently having sediment load issues stemming from a fairly large feeder creek which outflows into my pond. Over the past weekend we had 3" of rain in 90 minutes which flooded the creek, yet again, and deposited a ton of sediment in to my water. A buddy of mine happens to be a civil engineer specializing in drainage and green solutions to runoff issues - he suggested slowing the creek outflow by building a series of weirs along the creeks path. I'm going to start on this project this evening and thought I should share the progress.

The water had to have reached 3-4' in order to displace the grass this high on the creek bank


Here you can see the amount of clay sediments at the outlet of the creek and the leaves/grasses caught by the deadfall. The clay extends 4-5' into the water and quickly drops down to 8' of water within the next 5'

This entire peninsula didn't exist 20 years ago (the pond was built in the 60's) and has added 10' of length into the pond over the last 10 years.

This is the creek mouth before I dropped the pond water level 18" by clearing obstructions from the outlet pipe about 6 weeks ago


Here is a map of the roughly 12 acre watershed for the creek


My pan is to build the largest weir first, starting this week, just upstream from the mouth of the creek. I'll be building a wall of cinder blocks anchored by old steel fence posts reclaimed from my lot. I'll obtain some free bricks from recent area building demos to line the outfall from the weir and over fill with gravel washed down our seal coat subdivision roads.

The 2nd phase will include hauling straw bails further up stream to be placed in very low flow areas of the creek.

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#474523 - 06/20/17 12:08 PM Re: Feeder Creek Sediment Control [Re: Matzilla]
snrub Offline


Registered: 10/05/13
Posts: 3984
Loc: SE Kansas
Sounds like an interesting project that should work well.

Althouh weirs would not specifically be a pond as such, I'm still going to add this thread to the list of sediment, forage and specialty ponds I keep.


Edited by snrub (06/20/17 12:09 PM)
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#474528 - 06/20/17 12:58 PM Re: Feeder Creek Sediment Control [Re: Matzilla]
Quarter Acre Online   content


Registered: 06/10/16
Posts: 280
Loc: West Central Missouri
Weir's, if tight enough to hold back water should help drop out sediment even if they are not tight enough to maintain even a wet spot after the rains subside. My take is that you want the weir to cause a backup situation that ultimately slows the linear velocity of the water stream down enough to allow debris, caught up in the current, to settle out in the temporary pool. If the weir works well, eventually it will fill up with dirt and such and the water stream will be able to maintain its velocity and carry the debris on down to the pond. Hence weir maintenance instead of pond maintenance. And, anytime you slow the water velocity down, it is not eroding the creek as fast. I would place the weirs were they can create the largest pools possible yet allow for future clean out access with a skid steer or the like.

I agree with snrub...cool project! I hope it does not involve a hand shovel too much.
_________________________
Fish on!,
Noel
1/4 Acre Pond - FHM, Spring Peepers, Bull, Tree, and Leopard Frogs, Toads, tons of tadpoles, and some water snakes frown

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#474554 - 06/20/17 04:39 PM Re: Feeder Creek Sediment Control [Re: Matzilla]
Matzilla Offline


Registered: 08/12/16
Posts: 102
Loc: Iowa
I started early since there's some rain on the way. I laid two cinder blocks in the creek channel and placed another pair on top which are anchored into the banks with 4' sections of rebar. There's a pair of steel fence posts in the two center holes of all 4 blocks. I'll reinforce the upstream side with bricks and cover the downstream side with the bricks, gravel and rock I can get. As is it backed up amost 6" of water and allows a small trickle to pass through - it should be pretty decent at slowing the water down when all said and done.








Here is how you transport cinderblocks down a steep hill to the pond where motorized equipment cannot access

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#474559 - 06/20/17 05:06 PM Re: Feeder Creek Sediment Control [Re: Matzilla]
Quarter Acre Online   content


Registered: 06/10/16
Posts: 280
Loc: West Central Missouri
If you can throw some leaf rakings and shrub trimmings on the uphill side of your cinderblocks (not too much is the trick) you could slow it down some more and get a bit of a filtering effect along with some baking up of the water. Even some sticks and twigs alone would start to collect the leaves and such coming down the hill and naturally create filter.

Nice repurposing of the sled!
_________________________
Fish on!,
Noel
1/4 Acre Pond - FHM, Spring Peepers, Bull, Tree, and Leopard Frogs, Toads, tons of tadpoles, and some water snakes frown

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#474563 - 06/20/17 06:10 PM Re: Feeder Creek Sediment Control [Re: Matzilla]
Matzilla Offline


Registered: 08/12/16
Posts: 102
Loc: Iowa
Great idea!!! I have some arborvitae trimmings that should do the trick

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#474598 - 06/21/17 09:42 AM Re: Feeder Creek Sediment Control [Re: Matzilla]
Matzilla Offline


Registered: 08/12/16
Posts: 102
Loc: Iowa
I lugged 4 buckets full of bricks down and placed them on the weir

upstream side


downstream side


tonight I will add some evergreen trimmings to the upstream side and maybe two more buckets of bricks

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#474763 - 06/23/17 03:46 PM Re: Feeder Creek Sediment Control [Re: Matzilla]
Matzilla Offline


Registered: 08/12/16
Posts: 102
Loc: Iowa
I took my sons to collect materials for the next large weir to be built on my pond inlet - there's another 1 acre pond 100 yards from this point, my inlet is direct runoff from the upper pond's 12" outlet. The water passes though a very shallow, boggy, threaded delta of a marsh which is extremely heavy with light clay sediments as it meets the pond. Max cfs is right around 10 where as max cfs on my feeder creek is around 50-100. max outflow of my pond's outlet is near 40-60



I have 10 cinder blocks, 4' sticks of 1/2" emt (for anchors), 2 large steel fence posts (primary anchors), 50 bricks, 100lbs of large river rock, and some filter aggregate. So far the filter aggregate is a pair of 5 gallon buckets of 1" to 3" sized river rock and 3 gallons of mixed sands. We will need to gather 3x this much aggregate to finish off the project. I've enlisted my 10 and 12 year old sons to help with this one haha

This weir will be vshaped with cinder blocks focusing the flow to a central outlet where it will flow over a field of bricks. The open end of the v will be layered with the large river rock, bricks, mixed aggregate and sand. Ahead of the aggregate will be a series of rock/brick/aggregate riffles to slow high flows.

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#474768 - 06/23/17 05:08 PM Re: Feeder Creek Sediment Control [Re: Matzilla]
snrub Offline


Registered: 10/05/13
Posts: 3984
Loc: SE Kansas
Looks good but you may have a problem of washing dirt out aroung the edge starting a new wash to the side.

Trick is to keep the water flowing against something that will not erode.

Try what you have and add as needed.
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snrub

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#476213 - 07/17/17 09:48 AM Re: Feeder Creek Sediment Control [Re: Matzilla]
Matzilla Offline


Registered: 08/12/16
Posts: 102
Loc: Iowa
I've been keeping an eye on the small weir and so far so good. It has backed up quite a bit of clay and sand since being installed and the sides are holding up fine. During big rains the water tops that weir and flows over instead of pounding the steep bank. The v-notch allows quite a bit of flow during moderate rain events.

Here is the 2nd weir so far


I still need to add 5 more cinder blocks, 25 bricks, and ~300lbs of rock just to the front side. The backside of the weir will need around 500lbs of rock total. We have managed to filter about 60% of the incoming flow at current state.

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