DOCSLIB.ORG

SEDIMENT BASIN (No.) Code 350

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
SEDIMENT BASIN (No.) Code 350 SEDIMENT BASIN (No.) Code 350 Natural Resources Conservation Service Conservation Practice Standard I. Definition filter strips, etc., to reduce the amount of sediment flowing into the basins. A basin constructed to collect and store debris or sediment. The basin shall be located to intercept sediment before it enters streams, lakes, and wetlands. For II. Purpose maximum effectiveness, the basin must be located close to the sediment source. To preserve the capacity of reservoirs, lakes, wetlands, ditches, canals, diversions, waterways, and The capacity of the sediment basin shall equal streams; to prevent undesirable deposition on bottom the volume of sediment expected to be trapped at lands and developed areas; to trap sediment the site during the planned life of the basin or the originating from construction sites; and to reduce or improvements it is designed to protect. abate pollution by providing basins for deposition and storage of silt, sand, gravel, stone, agricultural Sediment basins meeting these design criteria are wastes, and other detritus. assumed to have an 80% trapping efficiency. III. Conditions Where Practice Applies volume = calculated erosion * planned life * SDR * trap efficiency * 23.5 ft3/ton This practice applies where physical conditions or land ownership preclude treatment of a sediment Where: source or where a sediment basin offers the most 3 practical solution to reduce sediment delivery to Volume = cubic feet (ft ) downstream areas. Calculated erosion = sheet and rill, gullies, etc. (Tons / year) Sediment basins having the primary purpose of controlling suspended solids loading and attached SDR= sediment delivery ratio pollutants from runoff with a permanent pool of Trap Efficiency Assumed to be 80% watershall meet the criteria set forth in Wisconsin Department of Natural Resources (DNR) Standard If it is determined that periodic removal of 1001, Wet Detention Basin. sediment will be practicable, the storage capacity may be proportionately reduced. IV. Federal, State, and Local Laws Provisions shall be made for draining sediment Users of this standard should be aware of potentially pools if necessary for safety and vector control. applicable federal, state, and local laws, rules, regulations, or permit requirements governing Appropriate safety measures, such as warning sediment basins. This standard does not contain the signs, rescue facilities, and fencing, shall be text of federal, state, or local laws. provided as necessary to protect the public from floodwater and soft sediment. V. Criteria Sediment storage of the basin shall be a A. General Criteria for Non-Livestock Area minimum of 3 feet deep. Sediment Basins The minimum surface area of the sediment basin, Sediment basins should be used in conjunction measured at the principal spillway elevation, with erosion and sediment control practices, such shall be sized based on the texture of the soil as temporary seeding, mulching, diversions, entering the basin and the peak outflow during the 1-year, 24-hour design storm. Conservation Practice Standards are reviewed periodically and updated if needed. To obtain the current version of this standard, NRCS, WI download it from the electronic Field Office Technical Guide, or contact the NRCS State Office or the Wisconsin Land and Water 8/08 Conservation Association office at (608) 441-2677. 350-2 Sa = 1.2 * (qout / vs) orifice or other device as needed. The top of the perforated riser shall be capped or a trash Where: guard provided to prevent trash from reaching and plugging the orifice. Sa = Minimumm treatment surface area of the sediment basin (square feet) 2. Temporary Sediment Basins qout = Peak outflow (cubic feet/second) during the 1-year, 24-hour design Temporary sediment basins are used where storm for the principal outlet the basins will be used for periods of 2 years or less. They usually have earthen vs = Particle settling velocity (feet/second) embankments and/or excavated basins, and 1.2 = safety factor may have mechanical spillways, crushed stone or gravel outlets, or other appropriate Table 1 outlets. Class Vs (ft/sec) Size* Temporary sediment basins having a total 1 .0012 S, LS, SL embankment height of 5 feet or less and 2 .000073 L, SiL, Si, SCL where failure of the embankment or outlet 3 .000012 CL, SiCL, SC, SiC would not cause loss of life or damage to S = Sand Si = Silt C = Clay L = Loam high value property, may be designed with *Based on dominant textural class. an embankment having a minimum top width of 4 feet and side slopes of 2:1 (2 Shape – The length to width ratio of the flow horizontal to 1 vertical) or flatter. path shall be maximized with a goal of 3:1 or greater. The flow path is considered the general The minimum sediment storage capacity of direction of water flow within the basin a temporary sediment basin shall be 0.5 including the treatment surface area and any acre-inches per year from the contributing forebay. drainage area. The foundation preparation and cutoff, earth Removal – Temporary sediment basins shall embankments, principal spillways, and auxiliary be removed after the contributing drainage spillways shall be according to NRCS Field area has been stabilized. Complete final Office Technical Guide (FOTG), Section IV, grading and restoration according to the site Standards 378, Pond; or according to the plans. requirements in NRCS Technical Release 60, (TR-60), as appropriate. 3. Livestock Area Sediment Basins 1. Permanent Sediment Basins Sediment basins can be used to trap solids from concentrated livestock areas prior to Permanent sediment basins are used when entering storage, buffer, or filter systems. the basins will be used longer than 2 years. The basin can be either an off-lot basin or an They usually have earthen embankments on-lot basin with additional heavy use and/or excavated basins with mechanical protection for the livestock area. See NRCS spillways. FOTG, Section IV, Standard 561, Heavy Use Area Protection, for surfacing options. Minimum sediment storage capacity shall be 0.3 acre-inches from the contributing The bottom elevation of the sediment basin drainage area. shall be at least 2 feet above bedrock or groundwater. A minimum of 0.3 feet Basins may have a dry or wet sediment pool. freeboard shall be added to the storage Wet sediment pool basins are more effective depth. than dry sediment pool basins in trapping fine sediments. A normally dry sediment The sediment basin discharge shall be stored pool basin shall employ a drawdown device, or treated in accordance with NRCS FOTG, such as a perforated riser or subsurface Section IV, Standards 313, Waste Storage drain, that will drain the pool below the Facility, or 635, Vegetated Treatment Area, principal spillway crest while retaining the as applicable. sediment as much as practicable. The drawdown flow rate shall be regulated by an NRCS, WI 8/08 350-3 The design loadings and quality of materials 2 years and the drainage areas are less than 1 for wood and concrete walls shall be in acre. Temporary sediment barriers include accordance with the FOTG Standard 313, synthetic fabric silt fences, straw bale barriers, Waste Storage Facility. coarse aggregate barriers, and other appropriate materials. Runoff shall be based on the 25-year, 24- hour duration storm rainfall. The suggested A temporary sediment barrier may be used where runoff curve numbers are 90 for unpaved the minimum barrier height is less than 5 feet, lots and 95 for paved lots. The minimum and where failure of the barrier would not cause runoff curve number for unpaved lots shall loss of life or damage to high-value property, or be 85. significant damage to lower-value property. The barrier shall be adequate to retain the sediment The peak discharge from animal lot areas and handle the 10-year, 24-hour duration storm shall be a minimum of 1010 cubic feet per frequency discharge without failure or significant second per square mile for each inch of erosion for the anticipated life of the barrier. runoff. (NRCS Technical Release 55 [TR- 55], Exhibit 5-II, Tc=0.1 Hours, Travel 1. Straw Bale Sediment Barriers Time=0.0 Hours, and IA/P =0.10). Straw bale sediment traps should only be used in situations where a life span of less Flood routing of the sediment basin shall than 3 months is required. utilize procedures contained in TR-55, Chapter 6, or NRCS National Engineering Straw bale sediment traps shall be installed Handbook (NEH), Part 650, Engineering on the contour, except that the ends shall be Field Manual, Chapter 11. extended upslope to prevent water from bypassing the ends. The sediment basin shall have sufficient capacity, as a minimum, to store 65 percent The maximum length of uncontrolled slope of the peak inflow rate from a 25-year, 24- upstream from a straw bale sediment trap hour duration storm for a duration of 15 should be 100 feet. minutes. Any basin outflow shall be disregarded in computing minimum storage. Bales shall be installed so that the bindings are oriented around the bale, not the top and Additional storage capacity, based on bottom of the bales. frequency of cleaning, shall be provided for manure and other solids settled within the The straw bales must be entrenched at least basin. The solids storage volume shall be 4 inches into the ground and anchored with based on the number of livestock, time on two stakes driven through the bale and at the lot (minimum of 25 percent), and seven least 12 inches into the ground. The stakes days between cleanings. The minimum shall be 2" x 2" (nominal) wooden stakes, daily volume of solids per animal for design standard steel fence posts, or ½-inch purposes shall be as specified in Table 2. diameter steel reinforcing bars. Table 2 Soil shall be compacted against the upstream base of the bales to prevent undermining by Minimum Daily runoff.
Load more

Recommended publications
  • Deposition Patterns and Rates of Mining-Contaminated Sediment Within a Sedimentation Basin System, S.E
    BearWorks Institutional Repository MSU Graduate Theses Spring 2017 Deposition Patterns and Rates of Mining- Contaminated Sediment within a Sedimentation Basin System, S.E. Missouri Joshua Carl Voss Missouri State University - Springfield, [email protected] Follow this and additional works at: http://bearworks.missouristate.edu/theses Part of the Environmental Indicators and Impact Assessment Commons, Environmental Monitoring Commons, and the Hydrology Commons Recommended Citation Voss, Joshua Carl, "Deposition Patterns and Rates of Mining-Contaminated Sediment within a Sedimentation Basin System, S.E. Missouri" (2017). MSU Graduate Theses. 3074. http://bearworks.missouristate.edu/theses/3074 This article or document was made available through BearWorks, the institutional repository of Missouri State University. The orkw contained in it may be protected by copyright and require permission of the copyright holder for reuse or redistribution. For more information, please contact [email protected]. DEPOSITION PATTERNS AND RATES OF MINING-CONTAMINATED SEDIMENT WITHIN A SEDIMENTATION BASIN SYSTEM, BIG RIVER, S.E. MISSOURI A Masters Thesis Presented to The Graduate College of Missouri State University ATE In Partial Fulfillment Of the Requirements for the Degree Master of Science, Geospatial Sciences in Geography, Geology, and Planning By Josh C. Voss May 2017 Copyright 2017 by Joshua Carl Voss ii DEPOSITION PATTERNS AND RATES OF MINING-CONTAMINATED SEDIMENT WITHIN A SEDIMENTATION BASIN SYSTEM, BIG RIVER, S.E. MISSOURI Geography, Geology, and Planning Missouri State University, May 2017 Master of Science Josh C. Voss ABSTRACT Flooding events exert a dominant control over the deposition and formation of floodplains. The rate at which floodplains form depends on flood magnitude, frequency, and duration, and associated sediment transport capacity and supply.
    [Show full text]
  • State-Of-The-Practice: Evaluation of Sediment Basin Design, Construction, Maintenance, and Inspection Procedures
    Research Report No. 1 Project Number: 930-791 STATE-OF-THE-PRACTICE: EVALUATION OF SEDIMENT BASIN DESIGN, CONSTRUCTION, MAINTENANCE, AND INSPECTION PROCEDURES Prepared by: Wesley C. Zech Xing Fang Christopher Logan August 2012 DISCLAIMERS The contents of this report reflect the views of the authors, who are responsible for the facts and the accuracy of the data presented herein. The contents do not necessarily reflect the official views or policies of Auburn University or the Alabama Department of Transportation. This report does not constitute a standard, specification, or regulation. NOT INTENDED FOR CONSTRUCTION, BIDDING, OR PERMIT PURPOSES Wesley C. Zech, Ph.D. Xing Fang, Ph.D., P.E., D.WRE Research Supervisors ACKNOWLEDGEMENTS Material contained herein was obtained in connection with a research project “Assessing Performance Characteristics of Sediment Basins Constructed in Franklin County,” ALDOT Project 930-791, conducted by the Auburn University Highway Research Center. Funding for the project was provided by the Alabama Department of Transportation. The funding, cooperation, and assistance of many individuals from each of these organizations are gratefully acknowledged. The authors would like to acknowledge and thank all the responding State Highway Agencies (SHAs) for their participation and valuable feedback. The project advisor committee includes Mr. Buddy Cox, P.E., (Chair); Mr. Larry Lockett, P.E., (former chair); Mr. James Brown, P.E.; Mr. Barry Fagan, P.E.; Mr. Skip Powe, P.E.; Ms. Kaye Chancellor Davis, P.E.; Ms. Michelle Owens (RAC Liaison), and Ms. Kristy Harris (FHWA Liaison). iii ABSTRACT The following document is the summary of results from a survey that was conducted to evaluate the state-of-the-practice for sediment basin design, construction, maintenance, and inspection procedures by State Highway Agencies (SHAs) across the nation.
    [Show full text]
  • Sediment Basin
    Water Resources Division Sediment Basin Definition Sediment basins are temporary ponds with appropriate control structures, used on construction sites to capture eroded or disturbed soil that are washed off during or after rainstorms or other runoff events. Sediment basins are designed to protect the water quality of nearby streams, rivers, lakes, and wetlands, and to protect neighboring properties from damage. Some sediment basins are converted to permanent storm water controls following the completion of construction activity. Purpose and Description The primary purpose of sediment basins is to prevent sediment from entering streams, rivers, lakes, or wetlands. They do this by collecting and detaining runoff, allowing suspended solids to settle out prior to the runoff leaving a site. Sediment basins are also sometimes called settling basins, sumps, debris basins, or dewatering basins. Pollutant Controlled: Suspended solids Treatment Mechanism: Settling Removal Efficiency Sediment basins remove only 70 to 80 percent of medium- and coarse-sized sediment particles, so use them in conjunction with other erosion control best management practices (BMPs). Sediment basins are not effective at controlling fine soil particles such as silt or clay. Companion and Alternative BMPs Construction Barrier Mulching Polyacrylamide Riprap-Stabilized Outlet Seeding Sodding www.michigan.gov/deq MDEQ NPS BMP Manual SB-1 Rev20190208 Advantages and Disadvantages Advantages Sediment basins are a cost-effective measure for treating sediment-laden runoff from drainage areas ranging from five (5) to 100 acres in size, with soil particle sizes of predominantly sand, or medium to large silt. Sediment basins are relatively easy to construct. Disadvantages The construction and proper functioning of sediment basins require adequate space and topography.
    [Show full text]
  • Tennessee Erosion & Sediment Control Handbook
    TENNESSEE EROSION & SEDIMENT CONTROL HANDBOOK A Stormwater Planning and Design Manual for Construction Activities Fourth Edition AUGUST 2012 Acknowledgements This handbook has been prepared by the Division of Water Resources, (formerly the Division of Water Pollution Control), of the Tennessee Department of Environment and Conservation (TDEC). Many resources were consulted during the development of this handbook, and when possible, permission has been granted to reproduce the information. Any omission is unintentional, and should be brought to the attention of the Division. We are very grateful to the following agencies and organizations for their direct and indirect contributions to the development of this handbook: TDEC Environmental Field Office staff Tennessee Division of Natural Heritage University of Tennessee, Tennessee Water Resources Research Center University of Tennessee, Department of Biosystems Engineering and Soil Science Civil and Environmental Consultants, Inc. North Carolina Department of Environment and Natural Resources Virginia Department of Conservation and Recreation Georgia Department of Natural Resources California Stormwater Quality Association ~ ii ~ Preface Disturbed soil, if not managed properly, can be washed off-site during storms. Unless proper erosion prevention and sediment control Best Management Practices (BMP’s) are used for construction activities, silt transport to a local waterbody is likely. Excessive silt causes adverse impacts due to biological alterations, reduced passage in rivers and streams, higher drinking water treatment costs for removing the sediment, and the alteration of water’s physical/chemical properties, resulting in degradation of its quality. This degradation process is known as “siltation”. Silt is one of the most frequently cited pollutants in Tennessee waterways. The division has experimented with multiple ways to determine if a stream, river, or reservoir is impaired due to silt.
    [Show full text]
  • Reclamation of Tailings Ponds
    Journal American Society of Mining and Reclamation, 2012 Volume 1, Issue 1, COMPARISON OF HYDROLOGIC CHARACTERISTICS FROM TWO DIFFERENTLY RECLAIMED TAILINGS PONDS; GRAVES MOUNTAIN, LINCOLNTON, GA1 Gwendelyn Geidel2 Abstract: This study compares and evaluates the hydrologic characteristics between two kyanite ore process tailings ponds that were reclaimed with different reclamation strategies; one reclaimed with an impermeable membrane and the other with an open, surface reconfiguration (OSR) methodology. During the extraction and processing of kyanite ore from the Graves Mountain mine, Lincoln County, Georgia, fine grained tailings were produced. The tailings were transported by slurry pipeline to various tailings ponds which were created by the construction of dams using on-site materials. The first study site, referred to as the Pyrite Pond (PP), was constructed and filled during the 1960’s and early 1970’s. In early 1992, the PP was capped with an impermeable membrane, covered with a thin soil veneer and vegetated and in 1998 the upslope reclamation was completed. The second tailings pond, referred to as the East Tailings Pond (ETP), was constructed and filled in the 1970’s and early 1980’s and was reclaimed in 1995-96 by surface reconfiguration and the addition of soil amendments. Piezometers and wells were installed into the two tailings ponds and also in close proximity to the tailings ponds. While the initial study was aimed at comparing the two reclamation strategies, it became apparent that the ground water was a dominant factor. Results of the evaluation of the potentiometric surface data for varying depths within each tailings pond indicate that while both tailings ponds exhibit delayed response to precipitation events suggesting infiltration effects, the delay in the ETP deep wells and PP wells could not be adequately described by a surface infiltration model.
    [Show full text]
  • 5.00 Storm Water Pond Systems
    This guidance is not a regulatory document and should be considered only informational and supplementary to the MPCA permits (such as the construction storm water general permit or MS4 permit) and local regulations. CHAPTER 5 TABLE OF CONTENTS Page 5.00 STORMWATER-DETENTION PONDS............................................................................5.00-1 5.01 Pond Design Criteria: SYSTEM DESIGN.........................................................5.01-1 5.02 Pond Design Criteria: POND LAYOUT AND SIZE.........................................5.02-1 5.03 Pond Design Criteria: MAIN TREATMENT CONCEPTS...............................5.03-1 5.04 Pond Design Criteria: DEAD STORAGE VOLUME .......................................5.04-1 5.05 Pond Design Criteria: EXTENDED DETENTION ...........................................5.05-1 5.06 Pond Design Criteria: POND OUTLET STRUCTURES ..................................5.06-1 5.07 Pond Design Criteria: OPERATION AND MAINTENANCE..........................5.07-1 5.08 Pond Design Criteria: SPECIAL CONSIDERATIONS ....................................5.08-1 5.10 STORMWATER POND SYSTEMS..........................................................................5.10-1 5.11 Pond Systems: ON-SITE VERSUS REGIONAL PONDS ................................5.11-1 5.12 Pond Systems: ON-LINE VERSUS OFF-LINE PONDS ..................................5.12-1 5.13 Pond Systems: OTHER POND SYSTEMS.......................................................5.13-1 5.20 Ponds: EXTENDED-DETENTION PONDS..............................................................5.20-1
    [Show full text]
  • Maine Erosion and Sediment Control Practices Field Guide for Contractors
    Maine Erosion and Sediment Control Practices Field Guide for Contractors Maine Department of Environmental Protection ACKNOWLEDGEMENTS Production 2014 Revision: Marianne Hubert, Senior Environmental Engineer, Division of Watershed Management, Bureau of Land and Water Quality, Department of Environmental Protection (DEP). Illustrations: Photos obtained from SJR Engineering Inc., Shaw Brothers Construction Inc., Bar Mills Ecological, Maine Department of Transportation (MaineDOT), Maine Land Use Planning Commission (LUPC) and Maine Department of Environmental Protection (DEP). TECHNICAL REVIEW COMMITTEE: The following people participated in the revision of this manual: Steve Roberge, SJR Engineering, Inc., Augusta Ross Cudlitz, Engineering Assistance & Design, Inc., Yarmouth Susan Shaller, Bar Mills Ecological, Buxton David Roque, Department of Agriculture, Conservation & Forestry Peter Newkirk, MaineDOT Bob Berry, Main-Land Development Consultants Daniel Shaw, Shaw Brothers Construction Peter Hanrahan, E.J. Prescott William Noble, William Laflamme, David Waddell, Kenneth Libbey, Ben Viola, Jared Woolston, and Marianne Hubert of the Maine DEP Revision (2003): The manual was revised and reorganized with illustrations (original manual, Salix, Applied Earthcare and Ross Cudlitz, Engineering Assistance & Design, Inc.). Original Manual (1991): The original document was funded from a US Environmental Protection Agency Federal Clean Water Act grant to the Maine Department of Environmental Protection, Non- Point Source Pollution Program and developed
    [Show full text]
  • Sediment Basin Design Fact Sheet
    Sediment Basins SEDIMENT CONTROL TECHNIQUE Type 1 System Sheet Flow Sandy Soils Type 2 System Concentrated Flow Clayey Soils Type 3 System Instream Works Dispersive Soils Symbol Photo 1 – Type A basin Photo 2 – Type C basin Key Principles 1. Sediment trapping is primarily achieved through particle settlement. Some basins may incorporate a filtration system within the outlet structure, but these filters are generally unreliable. Consequently the focus should always remain on achieving effective particle settlement. 2. Achieving optimum particle settlement relies upon achieving uniform flow conditions across the settling pond, and if chemical dosing is required, selecting the most appropriate flocculant and/or coagulant, and then achieving effective ‘mixing’ prior to the treated flows entering the settling pond. 3. The size of the settling pond is directly related to the ‘volume’ of runoff and/or peak design ‘discharge’. Pond volume is critical for basins operate as plug flow systems; while the pond surface area is critical for sediment basins that operate as continuous flow systems. Both pond volume and surface area are critical for Type A basins. 4. It should be noted that even if a basin is full of water, it can still be effective in removing coarse sediments from inflows. Therefore, unlike permanent stormwater treatment ponds, flows in excess of the design storm should still be directed through the sediment basin. Design Information A sediment basin is a purpose built dam designed to collect and settle sediment-laden water. It usually consists of an inlet chamber (forebay), a primary settling pond, a decant system, and a high-flow emergency spillway.
    [Show full text]
  • Sediment Basins `
    SC DHEC Stormwater BMP Handbook Sediment Control BMPs – Sediment Basins ` Sediment Basins FEATURES • Sediment Control • Volume Control • Velocity Control SECTIONS • General Design • Forebays • Porous Baffles • Basin Dewatering • Skimmers • Spillways • Permanent Pools Introduction • Maintenance Sediment Basins are a Best Management Practice (BMP) used to • Design Aids collect and impound stormwater runoff from disturbed areas (typically ALSO ADDRESSED 5 acres or more) at construction sites to restrict sediments and other pollutants from being discharged off-site. These basins may also be • Inlet Protection used to control the volume and velocity of the runoff through a timed release by utilizing multiple spillways. It is through this attenuation of • Basin Safety runoff that sediment basins may be capable of meeting South • Sediment Storage Carolina’s Design Requirements, specifically the Total Suspended Solids (TSS) removal efficiency of 80%. • Slope Stabilization These basins work most effectively in conjunction with additional • Rock Berms sediment and erosion control BMPs installed and maintained up • Outlet Protection gradient of the basins. • Basin Removal Guidance Disclaimer This is a guidance document and may not be feasible in all situations. Alternative means and methods for sediment basin design and PLAN SYMBOL construction also may be employed. All means and methods must comply with the DHEC South Carolina NPDES General Permit for Stormwater Discharges from Construction Activities (Permit). Approved means and methods include those published and approved by an MS4 in compliance with the Permit. In addition, a licensed Professional Engineer may design a sediment basin that, when constructed, accommodates the anticipated sediment loading from the land-disturbing activity and meets a removal efficiency of 80% suspended solids or 0.5 ML/L peak settable solids concentration, whichever is less, while remaining in compliance with the Permit.
    [Show full text]
  • SEDIMENT BASIN (No.)
    Standard 350 NATURAL RESOURCES CONSERVATION SERVICE CONSERVATION PRACTICE STANDARD ARIZONA SEDIMENT BASIN (No.) CODE 350 DEFINITION Where the Hazard Class of the dam is Low. Where site conditions shall be such that A basin constructed with an engineered outlet, runoff from the design storm can be safely formed by an embankment or excavation or a passed through (1) a natural or constructed combination of the two. auxiliary spillway, (2) the combination of a principal spillway and auxiliary spillway, or (3) PURPOSE a principal spillway. To capture and detain sediment laden runoff, or This practice is also serves to: other debris for a sufficient length of time to Preserve the capacity of reservoirs, wetlands, allow it to settle out in the basin. ditches, canals, diversion, waterways, and streams CONDITIONS WHERE PRACTICE Prevent undesirable deposition on bottom APPLIES lands and developed areas or trap sediment originating from construction sites or other This practice applies to urban land, construction disturbed areas sites, agricultural land, and other disturbed Reduce or abate pollution by providing lands: basins for deposition and storage of silt, sand, Where physical conditions or land ownership gravel, stone, agricultural waste solids, and preclude treatment of a sediment source by the other detritus installation of erosion-control measures to keep soil and other material in place or where a CRITERIA sediment basin offers the most practical solution to the problem. Sediment Basins shall be designed on an Where failure of the basin will not result in individual basis to meet site conditions and loss of life, damage to homes, commercial or functional requirements.
    [Show full text]
  • Sediment Control Measures
    Sediment Control Measures Treat the Problem! Storm Drain Inlet Protection Measures Water Body Protection Measures Down-Slope Protection Measures Stabilized Construction Vehicle Access & Exit Points Dust Generation & Track-Out from Vehicles Soil Stockpiles Non-Storm Water Discharges Sediment Basins Storm Drain Inlet Protection Measures Install appropriate protection measures to minimize the discharge of sediment prior to entry into the inlet Inlet Protection vs. Plow Destruction Habitat Protection? Where’s the Best in this management practice? This is No Place for Sediment to Collect - $$$$$$ What’s in this Storm System? Who’s Cleaning it Out? Protect Inlets Until Final Site Stabilization is Completed! Bylaw 2006 No. 16138 Install and maintain filter fabric bags inside any catch basins, lawn basins, exposed manholes or any other storm sewer access point collecting runoff from the site. Inlet Protection Catch Basin Inserts Maintenance Issues Will Traffic Destroy Your Efforts? Midtown Anchorage Will Your Efforts Destroy Traffic ? Photo Courtesy David Jenkins Storm Drain Inlet Protection • Keeps coarse sediment out of drainage systems • Above ground methods: silt fence, Exert, Dandy Bag • Below ground: catch basin filter BMP WA C-220 OR SC-8 AK - 19 Water Body Protection Measures Install appropriate protection measures to minimize the discharge of sediment prior to entry into the water body. For water bodies located on site or immediately downstream of the site. Tok Turbidity Curtain / Oil Boom • Where intrusion into a watercourse is necessary • Tidal and non-tidal uses • Maximum flow velocity of 5 feet per second • Locate parallel to flow, not across a channel Kotzebue BMP OR RC-10 Columbia River Tidal Influences make maintenance difficult Turbidity / Silt Curtain Ketchikan Down Slope Sediment Controls Gakona Establish and use down-slope sediment controls where storm water will be discharged from disturbed areas of the site.
    [Show full text]
  • 4.7 Sediment Traps and Basins
    4.7 Sediment Traps and Basins General Information The purpose of a temporary trap or basin is to provide an area where muddy runoff is allowed to pond, so sediment will settle out. Sediment traps and basins should be installed in selected drainage areas before excavation or fill work begins. Do not depend on sediment traps and basins alone to control sediment loss from your construction site. Sediment basins and traps should fill with muddy runoff during and immediately after a rain storm and drain down slowly over the next 1–2 days. Containment for the ponding area can be provided by an excavation or a dike made of earth or stone. Low-lying sites on the downhill side of bare soil areas are ideal places to install temporary sediment traps and basins. In general, sediment traps are designed to treat runoff from about 1 to 5 acres. Sediment basins are larger, and serve areas larger than 5 acres. Basins draining areas larger than 10 acres require an engineered design and are often designed to function as a permanent stormwater treatment pond after construction is complete. If feasible, do not put sediment traps or basins in or next to flowing streams or other waterways. Make sure pooled water does not flood buildings, roadways, utilities, or other structures. Construction of a permanent, stable outlet is key to long-term performance. Temporary Sediment Traps Any depression, swale, or low-lying place that receives muddy flows from exposed soil areas can serve as a sediment trap site. Installing several small traps at strategic locations is often better than building one large basin.
    [Show full text]