By American Society of Civil Engineers.; Environmental and Water Resources Institute (U.S.). Urban Drainage Standards Committee
Read Online or Download Standard guidelines for the design, installation, and operation and maintenance of urban subsurface drainage : three complete standards PDF
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Additional info for Standard guidelines for the design, installation, and operation and maintenance of urban subsurface drainage : three complete standards
Example text
Permittivity, not permeability, should be used because evaluating the quantity of water that would pass through the fabric under a given head over a given cross-sectional area without regard to fabric thickness is important. S. standard sieve with openings next larger to the actual size of the geotextile openings as determined by the ASTM D4751 method. The fabric-soil relationship should be A0S/D85 ԛ 1. Two properties critical to the survivability of a geotextile are grab strength and elongation.
Selection of the proper drainage system to control the anticipated flow will vary with the specific application, but in all applications the procedure begins with a determination of the allowable subsurface water elevation and the drain depth. Spacing of drains can then be calculated, and a discharge can be computed for each drain. Most methods for estimating drain spacing are empirical and were developed to meet specific characteristics of a particular area. Some methods are based on assumptions of steady-state flow conditions where the hydraulic head does not vary with time.
Figure 4-7 illustrates a typical impervious system. 4 Recreational and Turf Areas. Recreational and turf areas, such as parks, golf courses, and athletic fields, are also used for detention or retention of surface water. Because of the relatively large size of these facilities, the cost of a subsurface drainage system can be significant. The system used should be designed for low maintenance and should take into account variations of the surface over time. All the collection systems are applicable in one form or another, although the importance of keeping these areas “dry” should be weighed before a system is designed.