The shear stress is determined by the method given below.ĭitches are designed to at least the minimum freeboard shown in EPG 748.3 Freeboard. The depth of flow in the channel is determined by means of open channel flow computations as discussed in Open Channels. The design flow rates at various points along the channel are computed by means of the rational formula as discussed in Hydrologic Analysis. The type of lining which will provide the necessary protection at the least cost is generally selected. The selection of proper erosion protection consists of estimating the design flow rate at points along the channel length and determining the depth of flow and corresponding shear stress at these points, for various types of linings. It is usually cheaper to widen ditches or flatten special ditch grades than to use sod, erosion control blankets, rock or pavement. Economy is the prime factor for the final selection of the type of ditch protection. Ditch erosion is controlled by widening ditches, flattening ditch grades, or by application of proper ditch protection such as mulch, sodding, erosion control blanket, rock ditch liner and paved ditches. All ditches are analyzed to determine erosion control measures necessary to minimize maintenance. Control of sheet erosion is discussed in Embankment Protection and Pollution, Erosion and Sediment Control.Ĭontrol of ditch erosion is given careful consideration during design to reduce maintenance costs and to improve appearance. This article is concerned with methods and criteria for the control of gully erosion in roadside channels and at culvert outlets. These provisions must include measures for the control of both sheet and gully erosion during and after construction. Providing for the control of erosion is a necessary part of the complete design of any highway construction project.
A professional-grade concrete dissolver may be your only hope of getting that drain cleared.
Concrete flume with energy dissipators professional#
When mentioning a certain brand, it is because that is what an expert or professional has recommended. The purpose of this article is not to advertise for any specific drain cleaning product. You can also use a high-pressure hose to flush the line. Pour dissolver if necessary, wait, then use the shop vac to suck out the concrete. If the concrete is still wet, use a shop vac to remove the concrete (make sure to clean your vac thoroughly). To dissolve concrete in a drainpipe, use a concrete dissolver, acid, a plumbing snake, or an electric power auger.
Concrete flume with energy dissipators how to#
Whatever the reason, now you have to figure out how to dissolve concrete in the drainpipe. Maybe you cleaned your tools wet with concrete near the drain system or some of the powdered concrete mix ended up spilling into a sink. It happens to the best of us we’re so involved in getting our new project done that we become careless and overlook something.
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