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Discussion in 'Shop Talk' started by bethlaf, Mar 3, 2005.
anyone have experience in Either?
I have experience. What do you need to ask?
Talk to the proper athorities in addition to your planning. Damming especially affects natural water ways & those above & below you, and can be a really bad & expensive thing to do without the right permits.
Is it possible to do these yourself, with out much pain and agony, or should you hire it out. If I hire out, it will cost me more then the equipment to actually do it myself.
I have 80 acres, and we are going to put in several wildlife ponds in various areas on the property in addition to one close to the house for fish and swimming.
We do have a nice creek that has enough shed to do a five to six acre lake, we only want about an acre or two.
It will not ever effect anyone above us, and there is only on below us. The water flow will be interupted for about a week.
Is there a way to do an effective damn with out the clay Keyway?
Check with the USDA for help. Planning is essential, or you're wasting your time (lots of it) and money.
You'll need to know your soil, sub-soil types (there may be CLAY down there!), the USDA can tell you what you got.
I think you missed it this year, the USDA has conservation partial grants for surface runoff control, paying 70-80% of the cost of dam building. (brother just did one, I missed it... again...)
Some universities offer their survey services FREE, they can tell you everything you need to know for your acerage, calculate all the flow/evaporation rates, pond size and expectations.
It doesn't sound like you'd be backing up water over someone elses property - that's a plus.
However, you can't interrupt the flow of water.... reduce it, yes, interrupt it, no. Makes dam construction kinda interesting.
Rather than the USDA you need to talk to your local Natural Resources Conservation Agency office. They can call in help from the state to do much of the evaluation and engineer work. Paying a share??? Depends on their funding and priorities. This is somewhat of a greater use issue, to where you are putting watershed to greater use by impounding some of it to the benefit of wildlife, particularly migrating species.
However, get professional help or you may end up with an expensive mud pit.
On filling the pond/lake, it will take a lot longer than you think. I can drain mine down 4' and then refill it via a 6" pipe to a spring run. Going full bore it takes a week to bring the pond of an acre or so back up to full. If I let the springs in the pond do it, takes a month.
Pay particular attention to the spillway so it has no chance of eroding even in the heaviest rainy weather. Also check into putting a drain near the bottom so you can drain it down if you should need to.
Mine was done through both digging out and diking. Cost (at the time) was about $1K a day for a large trackhoe, dozen and 2-3 dump trucks to take what was dug out elsewhere on the property for spreading.
Here http://muextension.missouri.edu/explore/agguides/agengin/g01530.htm at the bottom of the page is a good view of a siphon spillway that I have used and found to be of significant benefit on small farm ponds.
You will need the core if the dam is built across a stream. Additionally you will need an emergency spillway to handle the water that the regular spillway cannot accomodate during a storm. With the acreage you have I doubt that you will completely disrupt the available water downstream during the fill time of the pond. I have found that here in NC that enough water will build downstream from small springs to meet the needs of cattle and wildlife. The volume of water will just lessen. As long as I am building a pond that is less than 14 feet deep and the area is less than 3 acres there is little or no supervision required. For larger ponds an onsite engineer is required in NC. You extension agent can bring you current on your state's requirements. I can build a pond of 2 acres +or- including the spillway materials for approximately $4500 provided the site is desireable. I do not remove the stumps that are out of the dam sites area as I like to provide conditions that are beneficial to the fish that I stock.
I did some research when I thought I was going to dig a pond on how to keep it water tight. Here are some links I found that may be of value to you. From what I understand there is Bentonite Granules, Powdered Clay, Bentomat or Bentofix. I believe some local Pond companies will carry these products: