Bouwer & Rice Book

[rogerstv]

I am looking for the two books written for analyzing rising slug test data and written by these two authors. Or, I am willing to purchase any other recommended book that explains the Bouwer and Rice method of interpreting data.

Thank you.

 

[Ron]

I don't know that the Bouwer and Rice references are available... you might try this one (referencing Bouwer and Rice)....

http://www.amazon.com/Design-Perfor...=sr_1_1?ie=UTF8&s=books&qid=1268697105&sr=1-1

 

[rogerstv]

Thanks. I was looking at that book. Do you have any experience with using it?

 

[fattdad]

I can likely find this and pdf it. Just have to find a place to host it and all. I think I can do this here, let me look at this tomorrow.

Tell me in advance if your screen and bentonite plug are entirely below the water table and whether you are planning a falling or rising head test.

f-d

¡papá gordo ain’t no madre flaca!

 

[rogerstv]

Fattdad,

I perform tests on a number of wells. It is the intention to install wells with the screen and plug above the water. But, seasonal fluctuations and the difference between the observed saturated soil and the potentiometric surface after installation sometimes results in a submerged screen and plug.

I have an Excel spreadsheet that does most of the calculations for me. However I don't understand where and how to draw the best fit lines and the actual B & R method. It will do me good to learn the method. I used to have a geologist that did it for me.

What I am looking for is the most recommended manual or book that will teach me the B & R method.

 

[fattdad]

When you are dealing with a water surface that intercepts the screened interval, the B&R method has an addiitonal complication or two. The method cites a "screen" length and also cites a well diameter. If you have a 10 ft screen and there is only a 4 ft water column, then you have to "think" like the equation and use 4 for your screen length. Now, consider the water surface that you are measuring in the well. It is determined by the water in the well AND the water in the gravel pack. It's just that the gravel pack has gravel occupying pore space. So, you have to calculate an equalivent well diameter that is normalized for the aggregate that's otherwise in the way. If you have a 2 in diameter stand pipe in an 8-in diameter hole, then using 2 inches would understate the change in head versus time.

When you are dealing with a water surface that intercepts the screen interval, I also think you should strictly use the rising head test. Think of what happens in the falling head test, you add water and watch it drop. During this phase of the test, the implication is that the water can flow equally horizontally into the entire wetted zone. I don't believe that. The portion of the formation above the water table has air in the way, which would act as an obstruction. I'd only do a rising head test for your typical condition.

All this stuff is important to figure when you do these tests. These are the boundary conditions that govern your hydraulic model. Don't overlook them! I've seen way too many folks just plug in the "screen" length (i.e., 10 ft) even when the water table is only 4 ft from the bottom.

One more thing. If you ever do have a test where the water has fully saturated the screened interval, make sure that it's fully above the plug also. The "screen" interval needs to consider the entire length of the gravel pack below the plug.

Good luck, I'll look for my paper. . .

f-d

¡papá gordo ain’t no madre flaca!