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REV94187
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REV94187
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Last modified
8/25/2016 3:19:44 AM
Creation date
11/21/2007 11:38:32 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981041
IBM Index Class Name
Revision
Doc Date
1/30/2001
Doc Name
MINE WATER INFLOW AND ELEVATION ANALYSIS ROADSIDE MINE POWDERHORN COAL CO PN C-81-041
Type & Sequence
TR33
Media Type
D
Archive
No
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IV. RATEGr r1LL <br />According to annual hydrology reports from the Roadside Mine, the inflows vary with time and <br />can't be measured directly. Data indicate that the inflow has varied between roughly 200 and <br />300 gallons per minute (gpm). These data aze summarized in Attachment 2. Currently, <br />approximately 30 gpm are discharged from the south mains sump through the south portal <br />dewatering pipe. <br />Empirical data presented in the 1999 annual hydrology report (Roadside Annual Hydrology <br />Report, Table M99-4) indicate that the change in water level (elevation of the surface of the <br />pool) equates to 1 foot elevation change for every 2,300.000 gallons of inflow (Attachment 3). <br />Calculations are presented using two possible rates of inflow - 200 gpm and 300 gpm (gallons <br />per minute). Time to fill is calculated assuming that no other discharge is occuring from the <br />mine -all inflow is added to the pool. The calculations presented below correlate closely with <br />similar projections provided by J.E. Stover and Associates (Attachment 2). <br />At a rate of 200 gpm inflow, <br />(200 gaUmin) x (1440 min/day) = 288,000 gaUday water added to the nw intake pool <br />Since the elevation of the pool rises 1 foot with each 2,300,000 gallons, the level would rise <br />0.125 feet per day if 200 gpm water were added to the pool. <br />(288,000 gal/day) x (1 ft rise/2, 300, 000 gal) = 0.125 frrise/day or 7.98 days per foot. <br />To elevate the pool from the siphon intake to the floor of the portal would take 55.9 days. <br />To elevate the pool at that rate to the roof of the portal would take 119.85 days. <br />At a rate of 300 gal/min inflow <br />(300 gaUmin) x (1440 min/day) = 432,000 gal/day water added to the nw intake pool <br />Since the elevation of the pool rises 1 foot with each 2,300,000 gallons, the level would rise <br />0.188 feet per day if 300 gpm water were added to the pool. <br />(432,000 gal/day) x (I ft rise/2, 300, 000 gal) = 0.188 ftrise/day or 5.32 days per foot. <br />To elevate the pool from the siphon intake to the floor of the portal would take 37.27 days. <br />To elevate the pool at that rate to the roof of the portal would take 79.8 days. <br />
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