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Ci~ of Paris Stud~ of Lake Crook March, 2001 <br /> <br />According to the Texas Natural Resource Conservation Commission inspection reports, the dam <br />and spillway are in good shape needing only minor repairs to stay in compliance with dam safety <br />regulations. <br /> <br />2.0.2 Water Quality. Water quality in Lake Crook is not nearly as good as it is in Pat Mayse. <br />Clarity of water is often measured in NTU's or turbidity units where the lower the turbidity units, <br />the clearer the water. Lake Crook has a turbidity usually between 80 and 100 whereas Pat Mayse <br />has turbidity in the 5 to 6 range. Turbidity manifests itself in water treatment by adding to the <br />chemical cost and shortening the filter cycle rates. More frequent backwashing is required and <br />more water wasted in doing so. <br /> <br />Figure 2 Lake Crook looking west down the south shore <br /> <br />2.0.3 Lake Crook Data. Lake Crook has the following statistics: <br /> <br />A water surface area of some 1,226 acres of land (Red River Authority of Texas) <br />A storage capacity (originally) of some 11,000 acre-feet (3.6 billion gallons) <br />A storage capacity (presently) of some 8,530 acre-feet (2.8 billion gallons) <br />Water shed drainage area of 48 square miles <br />Total area of city-owned land and lake about 2,700 acres <br />Height of the dam approximately 42 feet <br />Length of the dam approximately 3,200 feet <br />Crest width about 16 feet <br />Construction: Clay core - earth fdl dam with concrete armor plate on water side; <br />Spillway: 300 foot wide concrete Ogee weir <br />Siltation rate: 5% per 13 years <br /> <br />Page 12 of 45 <br /> <br /> <br />