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i <br />b) Disadvantages <br />Clogging of pores or perforated pipes. <br />Initial expense of installation. <br />c) Applicability <br />Applies very well in all types of urban de- <br />velopment. Can easily be incorporated with' <br />an undergroud storage cistern (number 1 above). <br />A very versatile practice. <br />6. Routing flow ever lawns or open vegetated areas <br />a) Advantages <br />Runoff delay. <br />Increased infiltration, <br />b) Disadvantages <br />•-Possible erosion scour <br />c) Applicability <br />All areas where lawns and open vegetated <br />.areas exist. <br />7. Retaining and creating a maximum amount of pervious <br />area <br />a) Advantages <br />Esthetically pleasing. <br />-Some runoff reduction because of infiltration <br />into the soil. <br />-•-Runoff delay (allowing more time for infiltra- <br />tion). <br />b) Disadvantages ' <br />-Cost and work required for establishment and <br />maintenance. <br />c) Applicability. <br />To all types of urban development, but pri- <br />marily residential areas and institutional areas <br />where large tracts of open space are retained. <br />One aspect of maintenance of lawns that is <br />-#sequently overlooked is the pH of the soil. <br />-Soils in this area tend to become acidic. By <br />neutralizing the pH with calcium carbonate the <br />following results can be expected: <br />1) Grass growth will be better because <br />pH is mote near neutral. <br />