1、r 1 ASCE STANDARD Standard Guidelines for the Design of Urban Stormwater Systems ASCE/EWRT 45-05 Standard Guidelines for Installation of Urban Stormwater Systems ASCE/EWRI 46-05 Standard Guidelines for the Operation and Maintenance of Urban Stormwater Systems ASCE/EWRI 47-05 This document uses both
2、the International System of Units (SI) and customary units AS C E ST A N D A R D ASCE/EWRI 45-05 ASCE/EWRI 46-05 ASCE/EWRI 47-05 American Society of Civil Engineers Standard Guidelines for the Design of Urban Stormwater Systems ASCE/EWRI 45-05 Standard Guidelines for the Installation of Urban Stormw
3、ater Systems ASCE/EWRI 46-05 Standard Guidelines for the Operation and Maintenance of Urban Stormwater Systems ASCE/EWRI 47-05 This document uses both the International System of Units (SI) and customary units. Urban Drainage Standards Committee of the Standards Development Council of the Environmen
4、tal and Water Resources Institute of the American Society of Civil Engineers Published by the American Society of Civil Engineers Library of Congress Cataloging-in-Publication data ASCEEWFU 45-05 (Standard guidelines for the design of urban stormwater systems), ASCEEWRI 46-05 (Standard guidelines fo
5、r the installation of urban stormwater systems), and ASCEEWRI 47- 05 (Standard guidelines for the operation and maintenance of urban stormwater systems). p. cm. “ASCEEWFU 45-05.” ISBN 0-7844-0806-8 1. Storm sewers-Standards. I. American Society of Civil Engineers. TD665.A83 2005 628l.212 021 8-dc22
6、2005022933 Published by American Society of Civil Engineers 1801 Alexander Bell Drive Reston, Virginia 20191 www.pubs.asce.org Any statements expressed in these materials are those of the indi- vidual authors and do not necessarily represent the views of ASCE, which takes no responsibility for any s
7、tatement made herein. No reference made in this publication to any specific method, product, process or service constitutes or implies an endorsement, recom- mendation, or warranty thereof by ASCE. ASCE makes no repre- sentation or warranty of any kind, whether express or implied, con- cerning the a
8、ccuracy, completeness, suitability, or utility of any information, apparatus, product, or process discussed in this publi- cation, and assumes no liability therefore. This information should not be used without first securing competent advice with respect to its suitability for any general or specif
9、ic application. Anyone utiliz- ing this information assumes all liability arising from such use, including but not limited to infringement of any patent or patents. ASCE and American Society of Civil Engineers-Registered in U.S. Patent and Trademark Office. Photocopies: Authorization to photocopy ma
10、terial for internal or personal use under circumstances not falling within the fair use provisions of the Copyright Act is granted by ASCE to libraries and other users registered with the Copyright Clearance Center (CCC) Transactional Reporting Service, provided that the base fee of $25.00 per artic
11、le is paid directly to CCC, 222 Rosewood Drive, Danvers, MA 01923. The identification for this book is 07844- 0806-8/06/ $25.00. Requests for special permission or bulk copying should be addressed to Permissions and industrial, commer- cial, residential, and recreation areas. This document is intend
12、ed for guidance during the design phase. These standard guidelines do not address applica- tions such as agricultural drainage, landfills, and injec- tion systems. Combined Sewer Overflows (CSOs) are also not addressed because they are environmentally unacceptable as a new standard of practice in th
13、e United States. Both SI units and customary units are used throughout the guidelines for the narrative, figures, and tables. The formulas are written in dual units or written separately to show the use of either SI units or customary units. 2.0 DEFINITIONS This section defines specific terms for us
14、e in this standard. Referenced documents can be used to enhance the understanding of the terms contained in this standard. AOS-Apparent opening size of geotextiles sometimes referred to as EOS (effective opening size). Aquifer-Geologic formation or group of forma- tions through which water flows or
15、within which water is stored. Base Drainage System-Permeable drainage blanket under a paved roadway, parking area, and so on. CBR-California Bearing Ratio. Chimney Drain-Interceptor drain frequently used in dams, embankments, and similar constructions to control seepage within the earthen structure.
16、 Collector Drain-Product or system intended for collecting and transporting. Colloidal Fines-Clay particles smaller than two microns. Drainable Water-Water that readily drains from soil under the influence of gravity. Evapotranspiration-Combined process of moisture evaporation from the soil and tran
17、spiration from plants. Frost Action-Freezing and thawing of soil mois- ture. Geocomposite-Geosynthetic materials for collecting and transporting water while maintaining soil stability. Geology-Surface formations. Geomembrane-Sheet material intended to form Geosynthetic-Synthetic material or structur
18、e an impervious barrier. used as an integral part of a project, structure, or system. Within this category are surface drainage and water control materials such as geomembranes, geotextiles, and geocomposites. sheet material intended to allow the passage of water, but not fines, and without collecti
19、ng fines at the soil- textile interface. Hydraulic Conductivity-See Permeability. Hydrology-Movement of water in nature. Impermeable Barrier Layer-Soil stratum with permeability less than 10% of the average soil perme- ability between the layer and the ground surface. Geotextile-Woven or nonwoven th
20、ermoplastic Infiltration-Movement of water into the soil. Longitudinal Drainage System-Drainage system essentially parallel to a roadway, parking area, and so on. free water held in a pervious stratum because of an underlying impervious stratum. water through soil. through a porous medium. textile t
21、o permit water flow perpendicular to its plane. fined body of groundwater. accelerates the removal of drainable surface water. soil and rock. allows surface drainage to enter the surface water system. Soil Texture-Relative proportions of sand, silt, and clay particles in a soil mass. Subsurface Wate
22、r-All water beneath the ground or pavement surface. Usually referred to as groundwater. Perched Water Table-Localized condition of Percolation Rate-Downward movement of Permeability-Rate at which water passes Permittivity-Measure of the ability of a geo- Phreatic Surface-Upper service of an uncon- Relief Drain-Any product or construction that Seepage-Movement of drainable water through Sink-Relatively small surface depression that 1
