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<br />. <br /> <br />PERV - Pervious. The estimated percentage of the area of the <br />basin considered to be pervious land, or land which allows some <br />runoff to infiltrate into the soil. (See Urban St.orm Drainage <br />Criteria Manual.) <br /> <br />Basin Descriptions <br /> <br />As explained in t.he previous section describing the drainage <br />basin mapping effort, drainage subbasins having tributary areas <br />ranging from 1000 to 3000 acres are identified and assigned an <br />index number. For each such basin, physical and hydrologic data <br />have been compiled, along with all current and relative data applying <br />to land use, population, jurisdiction, flood damage potential and ot.her <br />significant informat.ion. A Subbasin Description Summary Sheet has been <br />prepared for each subbasin with the following information: <br /> <br />(1) Major Basin - The major drainageway or direct flow basin to <br />the South Platte River corresponding to the four digit number <br />identifying the subbasin, is given to facilitate organization of the <br />information by major drainageways. <br /> <br />. <br /> <br />(2) Subbasin Number - This is the <br />subbasin described on the data sheet. <br />is described in detail in a preceding <br /> <br />identification number for the <br />The subbasin numbering system <br />section. <br /> <br />(3) Date Prepared, Revisions - The date prepared has been placed <br />on all summary sheets. As additional information is added or <br />revisions are made to the baseline situat.ion, the date of revision <br />can be inserted. <br /> <br />(4) Tributary Basin - This identifies the tributary drainageway <br />to the major basin and is furnished only when the tributary has an <br />established recognized name. When the tributary is unnamed, this <br />space is left blank. <br /> <br />(5) Mapping Number/Name - The number and name of all quadrangle <br />sheets upon which the subbasin appears is ident.ified here. Where the <br />subbasin appears on more than one quadrangle sheet, the one given first <br />is the one containing the physical and hydrologic data for the subbasin. <br /> <br />(6) City/County - The city and county in which the basin is located. <br />Where the basin is included in more than one jurisdiction, each is <br />identified. <br /> <br />. <br /> <br />(7) Physical Features - The area in square miles, channel length <br />and length to centroid of basin in miles, t.he unit hydrograph <br />coefficients, CT and CP, percentage of pervious area and channel slope <br />are listed in the indicat.ed spaces. These parameters are described <br />in detail in a preceding section. <br /> <br />9 <br />